diff --git a/arch/arm/include/asm/mach/time.h b/arch/arm/include/asm/mach/time.h
index d5adaae..1953e1b 100644
--- a/arch/arm/include/asm/mach/time.h
+++ b/arch/arm/include/asm/mach/time.h
@@ -10,7 +10,7 @@
 #ifndef __ASM_ARM_MACH_TIME_H
 #define __ASM_ARM_MACH_TIME_H
 
-#include <linux/sysdev.h>
+#include <linux/device.h>
 
 /*
  * This is our kernel timer structure.
diff --git a/arch/arm/mach-exynos/cpu.c b/arch/arm/mach-exynos/cpu.c
index 90ec247..d4c41f3 100644
--- a/arch/arm/mach-exynos/cpu.c
+++ b/arch/arm/mach-exynos/cpu.c
@@ -9,7 +9,7 @@
 */
 
 #include <linux/sched.h>
-#include <linux/sysdev.h>
+#include <linux/device.h>
 
 #include <asm/mach/map.h>
 #include <asm/mach/irq.h>
@@ -243,17 +243,18 @@
 	s5p_init_irq(NULL, 0);
 }
 
-struct sysdev_class exynos4_sysclass = {
-	.name	= "exynos4-core",
+struct bus_type exynos4_subsys = {
+	.name		= "exynos4-core",
+	.dev_name	= "exynos4-core",
 };
 
-static struct sys_device exynos4_sysdev = {
-	.cls	= &exynos4_sysclass,
+static struct device exynos4_dev = {
+	.bus	= &exynos4_subsys,
 };
 
 static int __init exynos4_core_init(void)
 {
-	return sysdev_class_register(&exynos4_sysclass);
+	return subsys_system_register(&exynos4_subsys, NULL);
 }
 core_initcall(exynos4_core_init);
 
@@ -294,5 +295,5 @@
 	if (soc_is_exynos4210() || soc_is_exynos4212() || soc_is_exynos4412())
 		s5p_reset_hook = exynos4_sw_reset;
 
-	return sysdev_register(&exynos4_sysdev);
+	return device_register(&exynos4_dev);
 }
diff --git a/arch/arm/mach-exynos/pm.c b/arch/arm/mach-exynos/pm.c
index 509a435..c4f792d 100644
--- a/arch/arm/mach-exynos/pm.c
+++ b/arch/arm/mach-exynos/pm.c
@@ -205,7 +205,7 @@
 
 }
 
-static int exynos4_pm_add(struct sys_device *sysdev)
+static int exynos4_pm_add(struct device *dev)
 {
 	pm_cpu_prep = exynos4_pm_prepare;
 	pm_cpu_sleep = exynos4_cpu_suspend;
@@ -301,8 +301,10 @@
 	} while (epll_wait || vpll_wait);
 }
 
-static struct sysdev_driver exynos4_pm_driver = {
-	.add		= exynos4_pm_add,
+static struct subsys_interface exynos4_pm_interface = {
+	.name		= "exynos4_pm",
+	.subsys		= &exynos4_subsys,
+	.add_dev	= exynos4_pm_add,
 };
 
 static __init int exynos4_pm_drvinit(void)
@@ -325,7 +327,7 @@
 		clk_put(pll_base);
 	}
 
-	return sysdev_driver_register(&exynos4_sysclass, &exynos4_pm_driver);
+	return subsys_interface_register(&exynos4_pm_interface);
 }
 arch_initcall(exynos4_pm_drvinit);
 
diff --git a/arch/arm/mach-s3c2410/cpu-freq.c b/arch/arm/mach-s3c2410/cpu-freq.c
index 75189df..7dc6c46 100644
--- a/arch/arm/mach-s3c2410/cpu-freq.c
+++ b/arch/arm/mach-s3c2410/cpu-freq.c
@@ -16,7 +16,7 @@
 #include <linux/interrupt.h>
 #include <linux/ioport.h>
 #include <linux/cpufreq.h>
-#include <linux/sysdev.h>
+#include <linux/device.h>
 #include <linux/clk.h>
 #include <linux/err.h>
 #include <linux/io.h>
@@ -115,24 +115,25 @@
 	.debug_io_show	= s3c_cpufreq_debugfs_call(s3c2410_iotiming_debugfs),
 };
 
-static int s3c2410_cpufreq_add(struct sys_device *sysdev)
+static int s3c2410_cpufreq_add(struct device *dev)
 {
 	return s3c_cpufreq_register(&s3c2410_cpufreq_info);
 }
 
-static struct sysdev_driver s3c2410_cpufreq_driver = {
-	.add		= s3c2410_cpufreq_add,
+static struct subsys_interface s3c2410_cpufreq_interface = {
+	.name		= "s3c2410_cpufreq",
+	.subsys		= &s3c2410_subsys,
+	.add_dev	= s3c2410_cpufreq_add,
 };
 
 static int __init s3c2410_cpufreq_init(void)
 {
-	return sysdev_driver_register(&s3c2410_sysclass,
-				      &s3c2410_cpufreq_driver);
+	return subsys_interface_register(&s3c2410_cpufreq_interface);
 }
 
 arch_initcall(s3c2410_cpufreq_init);
 
-static int s3c2410a_cpufreq_add(struct sys_device *sysdev)
+static int s3c2410a_cpufreq_add(struct device *dev)
 {
 	/* alter the maximum freq settings for S3C2410A. If a board knows
 	 * it only has a maximum of 200, then it should register its own
@@ -143,17 +144,18 @@
 	s3c2410_cpufreq_info.max.pclk =  66500000;
 	s3c2410_cpufreq_info.name = "s3c2410a";
 
-	return s3c2410_cpufreq_add(sysdev);
+	return s3c2410_cpufreq_add(dev);
 }
 
-static struct sysdev_driver s3c2410a_cpufreq_driver = {
-	.add		= s3c2410a_cpufreq_add,
+static struct subsys_interface s3c2410a_cpufreq_interface = {
+	.name		= "s3c2410a_cpufreq",
+	.subsys		= &s3c2410a_subsys,
+	.add_dev	= s3c2410a_cpufreq_add,
 };
 
 static int __init s3c2410a_cpufreq_init(void)
 {
-	return sysdev_driver_register(&s3c2410a_sysclass,
-				      &s3c2410a_cpufreq_driver);
+	return subsys_interface_register(&s3c2410a_cpufreq_interface);
 }
 
 arch_initcall(s3c2410a_cpufreq_init);
diff --git a/arch/arm/mach-s3c2410/dma.c b/arch/arm/mach-s3c2410/dma.c
index dbe43df..2afd000 100644
--- a/arch/arm/mach-s3c2410/dma.c
+++ b/arch/arm/mach-s3c2410/dma.c
@@ -14,7 +14,7 @@
 
 #include <linux/kernel.h>
 #include <linux/init.h>
-#include <linux/sysdev.h>
+#include <linux/device.h>
 #include <linux/serial_core.h>
 
 #include <mach/map.h>
@@ -132,7 +132,7 @@
 	},
 };
 
-static int __init s3c2410_dma_add(struct sys_device *sysdev)
+static int __init s3c2410_dma_add(struct device *dev)
 {
 	s3c2410_dma_init();
 	s3c24xx_dma_order_set(&s3c2410_dma_order);
@@ -140,24 +140,28 @@
 }
 
 #if defined(CONFIG_CPU_S3C2410)
-static struct sysdev_driver s3c2410_dma_driver = {
-	.add	= s3c2410_dma_add,
+static struct subsys_interface s3c2410_dma_interface = {
+	.name		= "s3c2410_dma",
+	.subsys		= &s3c2410_subsys,
+	.add_dev	= s3c2410_dma_add,
 };
 
 static int __init s3c2410_dma_drvinit(void)
 {
-	return sysdev_driver_register(&s3c2410_sysclass, &s3c2410_dma_driver);
+	return subsys_interface_register(&s3c2410_interface);
 }
 
 arch_initcall(s3c2410_dma_drvinit);
 
-static struct sysdev_driver s3c2410a_dma_driver = {
-	.add	= s3c2410_dma_add,
+static struct subsys_interface s3c2410a_dma_interface = {
+	.name		= "s3c2410a_dma",
+	.subsys		= &s3c2410a_subsys,
+	.add_dev	= s3c2410_dma_add,
 };
 
 static int __init s3c2410a_dma_drvinit(void)
 {
-	return sysdev_driver_register(&s3c2410a_sysclass, &s3c2410a_dma_driver);
+	return subsys_interface_register(&s3c2410a_dma_interface);
 }
 
 arch_initcall(s3c2410a_dma_drvinit);
@@ -165,13 +169,15 @@
 
 #if defined(CONFIG_CPU_S3C2442)
 /* S3C2442 DMA contains the same selection table as the S3C2410 */
-static struct sysdev_driver s3c2442_dma_driver = {
-	.add	= s3c2410_dma_add,
+static struct subsys_interface s3c2442_dma_interface = {
+	.name		= "s3c2442_dma",
+	.subsys		= &s3c2442_subsys,
+	.add_dev	= s3c2410_dma_add,
 };
 
 static int __init s3c2442_dma_drvinit(void)
 {
-	return sysdev_driver_register(&s3c2442_sysclass, &s3c2442_dma_driver);
+	return subsys_interface_register(&s3c2442_dma_interface);
 }
 
 arch_initcall(s3c2442_dma_drvinit);
diff --git a/arch/arm/mach-s3c2410/include/mach/dma.h b/arch/arm/mach-s3c2410/include/mach/dma.h
index ae8e482..acbdfec 100644
--- a/arch/arm/mach-s3c2410/include/mach/dma.h
+++ b/arch/arm/mach-s3c2410/include/mach/dma.h
@@ -13,7 +13,7 @@
 #ifndef __ASM_ARCH_DMA_H
 #define __ASM_ARCH_DMA_H __FILE__
 
-#include <linux/sysdev.h>
+#include <linux/device.h>
 
 #define MAX_DMA_TRANSFER_SIZE   0x100000 /* Data Unit is half word  */
 
@@ -202,7 +202,7 @@
 	struct s3c2410_dma_buf	*end;		/* end of queue */
 
 	/* system device */
-	struct sys_device	dev;
+	struct device	dev;
 };
 
 typedef unsigned long dma_device_t;
diff --git a/arch/arm/mach-s3c2410/pll.c b/arch/arm/mach-s3c2410/pll.c
index 8338865..c07438b 100644
--- a/arch/arm/mach-s3c2410/pll.c
+++ b/arch/arm/mach-s3c2410/pll.c
@@ -25,7 +25,7 @@
 #include <linux/types.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
-#include <linux/sysdev.h>
+#include <linux/device.h>
 #include <linux/list.h>
 #include <linux/clk.h>
 #include <linux/err.h>
@@ -66,30 +66,34 @@
     { .frequency = 270000000, .index = PLLVAL(127, 1, 1),  },
 };
 
-static int s3c2410_plls_add(struct sys_device *dev)
+static int s3c2410_plls_add(struct device *dev)
 {
 	return s3c_plltab_register(pll_vals_12MHz, ARRAY_SIZE(pll_vals_12MHz));
 }
 
-static struct sysdev_driver s3c2410_plls_drv = {
-	.add	= s3c2410_plls_add,
+static struct subsys_interface s3c2410_plls_interface = {
+	.name		= "s3c2410_plls",
+	.subsys		= &s3c2410_subsys,
+	.add_dev	= s3c2410_plls_add,
 };
 
 static int __init s3c2410_pll_init(void)
 {
-	return sysdev_driver_register(&s3c2410_sysclass, &s3c2410_plls_drv);
+	return subsys_interface_register(&s3c2410_plls_interface);
 
 }
 
 arch_initcall(s3c2410_pll_init);
 
-static struct sysdev_driver s3c2410a_plls_drv = {
-	.add	= s3c2410_plls_add,
+static struct subsys_interface s3c2410a_plls_interface = {
+	.name		= "s3c2410a_plls",
+	.subsys		= &s3c2410a_subsys,
+	.add_dev	= s3c2410_plls_add,
 };
 
 static int __init s3c2410a_pll_init(void)
 {
-	return sysdev_driver_register(&s3c2410a_sysclass, &s3c2410a_plls_drv);
+	return subsys_interface_register(&s3c2410a_plls_interface);
 }
 
 arch_initcall(s3c2410a_pll_init);
diff --git a/arch/arm/mach-s3c2410/pm.c b/arch/arm/mach-s3c2410/pm.c
index 4728f9a..4b948ec 100644
--- a/arch/arm/mach-s3c2410/pm.c
+++ b/arch/arm/mach-s3c2410/pm.c
@@ -24,7 +24,7 @@
 #include <linux/suspend.h>
 #include <linux/errno.h>
 #include <linux/time.h>
-#include <linux/sysdev.h>
+#include <linux/device.h>
 #include <linux/syscore_ops.h>
 #include <linux/gpio.h>
 #include <linux/io.h>
@@ -111,7 +111,7 @@
 	.resume		= s3c2410_pm_resume,
 };
 
-static int s3c2410_pm_add(struct sys_device *dev)
+static int s3c2410_pm_add(struct device *dev)
 {
 	pm_cpu_prep = s3c2410_pm_prepare;
 	pm_cpu_sleep = s3c2410_cpu_suspend;
@@ -120,52 +120,60 @@
 }
 
 #if defined(CONFIG_CPU_S3C2410)
-static struct sysdev_driver s3c2410_pm_driver = {
-	.add		= s3c2410_pm_add,
+static struct subsys_interface s3c2410_pm_interface = {
+	.name		= "s3c2410_pm",
+	.subsys		= &s3c2410_subsys,
+	.add_dev	= s3c2410_pm_add,
 };
 
 /* register ourselves */
 
 static int __init s3c2410_pm_drvinit(void)
 {
-	return sysdev_driver_register(&s3c2410_sysclass, &s3c2410_pm_driver);
+	return subsys_interface_register(&s3c2410_pm_interface);
 }
 
 arch_initcall(s3c2410_pm_drvinit);
 
-static struct sysdev_driver s3c2410a_pm_driver = {
-	.add		= s3c2410_pm_add,
+static struct subsys_interface s3c2410a_pm_interface = {
+	.name		= "s3c2410a_pm",
+	subsys		= &s3c2410a_subsys,
+	.add_dev	= s3c2410_pm_add,
 };
 
 static int __init s3c2410a_pm_drvinit(void)
 {
-	return sysdev_driver_register(&s3c2410a_sysclass, &s3c2410a_pm_driver);
+	return subsys_interface_register(&s3c2410a_pm_interface);
 }
 
 arch_initcall(s3c2410a_pm_drvinit);
 #endif
 
 #if defined(CONFIG_CPU_S3C2440)
-static struct sysdev_driver s3c2440_pm_driver = {
-	.add		= s3c2410_pm_add,
+static struct subsys_interface s3c2440_pm_interface = {
+	.name		= "s3c2440_pm",
+	.subsys		= &s3c2440_subsys,
+	.add_dev	= s3c2410_pm_add,
 };
 
 static int __init s3c2440_pm_drvinit(void)
 {
-	return sysdev_driver_register(&s3c2440_sysclass, &s3c2440_pm_driver);
+	return subsys_interface_register(&s3c2440_pm_interface);
 }
 
 arch_initcall(s3c2440_pm_drvinit);
 #endif
 
 #if defined(CONFIG_CPU_S3C2442)
-static struct sysdev_driver s3c2442_pm_driver = {
-	.add		= s3c2410_pm_add,
+static struct subsys_interface s3c2442_pm_interface = {
+	.name		= "s3c2442_pm",
+	.subsys		= &s3c2442_subsys,
+	.add_dev	= s3c2410_pm_add,
 };
 
 static int __init s3c2442_pm_drvinit(void)
 {
-	return sysdev_driver_register(&s3c2442_sysclass, &s3c2442_pm_driver);
+	return subsys_interface_register(&s3c2442_pm_interface);
 }
 
 arch_initcall(s3c2442_pm_drvinit);
diff --git a/arch/arm/mach-s3c2410/s3c2410.c b/arch/arm/mach-s3c2410/s3c2410.c
index 3d7ebc5..da66515 100644
--- a/arch/arm/mach-s3c2410/s3c2410.c
+++ b/arch/arm/mach-s3c2410/s3c2410.c
@@ -18,7 +18,7 @@
 #include <linux/init.h>
 #include <linux/gpio.h>
 #include <linux/clk.h>
-#include <linux/sysdev.h>
+#include <linux/device.h>
 #include <linux/syscore_ops.h>
 #include <linux/serial_core.h>
 #include <linux/platform_device.h>
@@ -131,22 +131,24 @@
 	s3c24xx_register_clock(&s3c2410_armclk);
 }
 
-struct sysdev_class s3c2410_sysclass = {
+struct bus_type s3c2410_subsys = {
 	.name = "s3c2410-core",
+	.dev_name = "s3c2410-core",
 };
 
 /* Note, we would have liked to name this s3c2410-core, but we cannot
- * register two sysdev_class with the same name.
+ * register two subsystems with the same name.
  */
-struct sysdev_class s3c2410a_sysclass = {
+struct bus_type s3c2410a_subsys = {
 	.name = "s3c2410a-core",
+	.dev_name = "s3c2410a-core",
 };
 
-static struct sys_device s3c2410_sysdev = {
-	.cls		= &s3c2410_sysclass,
+static struct device s3c2410_dev = {
+	.bus		= &s3c2410_subsys,
 };
 
-/* need to register class before we actually register the device, and
+/* need to register the subsystem before we actually register the device, and
  * we also need to ensure that it has been initialised before any of the
  * drivers even try to use it (even if not on an s3c2410 based system)
  * as a driver which may support both 2410 and 2440 may try and use it.
@@ -154,14 +156,14 @@
 
 static int __init s3c2410_core_init(void)
 {
-	return sysdev_class_register(&s3c2410_sysclass);
+	return subsys_system_register(&s3c2410_subsys, NULL);
 }
 
 core_initcall(s3c2410_core_init);
 
 static int __init s3c2410a_core_init(void)
 {
-	return sysdev_class_register(&s3c2410a_sysclass);
+	return subsys_system_register(&s3c2410a_subsys, NULL);
 }
 
 core_initcall(s3c2410a_core_init);
@@ -175,11 +177,11 @@
 #endif
 	register_syscore_ops(&s3c24xx_irq_syscore_ops);
 
-	return sysdev_register(&s3c2410_sysdev);
+	return device_register(&s3c2410_dev);
 }
 
 int __init s3c2410a_init(void)
 {
-	s3c2410_sysdev.cls = &s3c2410a_sysclass;
+	s3c2410_dev.bus = &s3c2410a_subsys;
 	return s3c2410_init();
 }
diff --git a/arch/arm/mach-s3c2412/cpu-freq.c b/arch/arm/mach-s3c2412/cpu-freq.c
index eb3ea17..d8664b7 100644
--- a/arch/arm/mach-s3c2412/cpu-freq.c
+++ b/arch/arm/mach-s3c2412/cpu-freq.c
@@ -16,7 +16,7 @@
 #include <linux/interrupt.h>
 #include <linux/ioport.h>
 #include <linux/cpufreq.h>
-#include <linux/sysdev.h>
+#include <linux/device.h>
 #include <linux/delay.h>
 #include <linux/clk.h>
 #include <linux/err.h>
@@ -194,7 +194,7 @@
 	.debug_io_show  = s3c_cpufreq_debugfs_call(s3c2412_iotiming_debugfs),
 };
 
-static int s3c2412_cpufreq_add(struct sys_device *sysdev)
+static int s3c2412_cpufreq_add(struct device *dev)
 {
 	unsigned long fclk_rate;
 
@@ -244,14 +244,15 @@
 	return -ENOENT;
 }
 
-static struct sysdev_driver s3c2412_cpufreq_driver = {
-	.add		= s3c2412_cpufreq_add,
+static struct subsys_interface s3c2412_cpufreq_interface = {
+	.name		= "s3c2412_cpufreq",
+	.subsys		= &s3c2412_subsys,
+	.add_dev	= s3c2412_cpufreq_add,
 };
 
 static int s3c2412_cpufreq_init(void)
 {
-	return sysdev_driver_register(&s3c2412_sysclass,
-				      &s3c2412_cpufreq_driver);
+	return subsys_interface_register(&s3c2412_cpufreq_interface);
 }
 
 arch_initcall(s3c2412_cpufreq_init);
diff --git a/arch/arm/mach-s3c2412/dma.c b/arch/arm/mach-s3c2412/dma.c
index d2a7d5ef..142acd3 100644
--- a/arch/arm/mach-s3c2412/dma.c
+++ b/arch/arm/mach-s3c2412/dma.c
@@ -14,7 +14,7 @@
 
 #include <linux/kernel.h>
 #include <linux/init.h>
-#include <linux/sysdev.h>
+#include <linux/device.h>
 #include <linux/serial_core.h>
 #include <linux/io.h>
 
@@ -159,19 +159,21 @@
 	.map_size	= ARRAY_SIZE(s3c2412_dma_mappings),
 };
 
-static int __init s3c2412_dma_add(struct sys_device *sysdev)
+static int __init s3c2412_dma_add(struct device *dev)
 {
 	s3c2410_dma_init();
 	return s3c24xx_dma_init_map(&s3c2412_dma_sel);
 }
 
-static struct sysdev_driver s3c2412_dma_driver = {
-	.add	= s3c2412_dma_add,
+static struct subsys_interface s3c2412_dma_interface = {
+	.name		= "s3c2412_dma",
+	.subsys		= &s3c2412_subsys,
+	.add_dev	= s3c2412_dma_add,
 };
 
 static int __init s3c2412_dma_init(void)
 {
-	return sysdev_driver_register(&s3c2412_sysclass, &s3c2412_dma_driver);
+	return subsys_interface_register(&s3c2412_dma_interface);
 }
 
 arch_initcall(s3c2412_dma_init);
diff --git a/arch/arm/mach-s3c2412/irq.c b/arch/arm/mach-s3c2412/irq.c
index 1a1aa22..a8a46c1 100644
--- a/arch/arm/mach-s3c2412/irq.c
+++ b/arch/arm/mach-s3c2412/irq.c
@@ -23,7 +23,7 @@
 #include <linux/module.h>
 #include <linux/interrupt.h>
 #include <linux/ioport.h>
-#include <linux/sysdev.h>
+#include <linux/device.h>
 #include <linux/io.h>
 
 #include <mach/hardware.h>
@@ -170,7 +170,7 @@
 
 static struct irq_chip s3c2412_irq_rtc_chip;
 
-static int s3c2412_irq_add(struct sys_device *sysdev)
+static int s3c2412_irq_add(struct device *dev)
 {
 	unsigned int irqno;
 
@@ -200,13 +200,15 @@
 	return 0;
 }
 
-static struct sysdev_driver s3c2412_irq_driver = {
-	.add		= s3c2412_irq_add,
+static struct subsys_interface s3c2412_irq_interface = {
+	.name		= "s3c2412_irq",
+	.subsys		= &s3c2412_subsys,
+	.add_dev	= s3c2412_irq_add,
 };
 
 static int s3c2412_irq_init(void)
 {
-	return sysdev_driver_register(&s3c2412_sysclass, &s3c2412_irq_driver);
+	return subsys_interface_register(&s3c2412_irq_interface);
 }
 
 arch_initcall(s3c2412_irq_init);
diff --git a/arch/arm/mach-s3c2412/pm.c b/arch/arm/mach-s3c2412/pm.c
index f4077ef..fd7210d 100644
--- a/arch/arm/mach-s3c2412/pm.c
+++ b/arch/arm/mach-s3c2412/pm.c
@@ -16,7 +16,7 @@
 #include <linux/list.h>
 #include <linux/timer.h>
 #include <linux/init.h>
-#include <linux/sysdev.h>
+#include <linux/device.h>
 #include <linux/syscore_ops.h>
 #include <linux/platform_device.h>
 #include <linux/io.h>
@@ -56,7 +56,7 @@
 {
 }
 
-static int s3c2412_pm_add(struct sys_device *sysdev)
+static int s3c2412_pm_add(struct device *dev)
 {
 	pm_cpu_prep = s3c2412_pm_prepare;
 	pm_cpu_sleep = s3c2412_cpu_suspend;
@@ -87,13 +87,15 @@
 	SAVE_ITEM(S3C2413_GPJSLPCON),
 };
 
-static struct sysdev_driver s3c2412_pm_driver = {
-	.add		= s3c2412_pm_add,
+static struct subsys_interface s3c2412_pm_interface = {
+	.name		= "s3c2412_pm",
+	.subsys		= &s3c2412_subsys,
+	.add_dev	= s3c2412_pm_add,
 };
 
 static __init int s3c2412_pm_init(void)
 {
-	return sysdev_driver_register(&s3c2412_sysclass, &s3c2412_pm_driver);
+	return subsys_interface_register_register(&s3c2412_pm_interface);
 }
 
 arch_initcall(s3c2412_pm_init);
diff --git a/arch/arm/mach-s3c2412/s3c2412.c b/arch/arm/mach-s3c2412/s3c2412.c
index 57a1e01..6c7253f 100644
--- a/arch/arm/mach-s3c2412/s3c2412.c
+++ b/arch/arm/mach-s3c2412/s3c2412.c
@@ -18,7 +18,7 @@
 #include <linux/init.h>
 #include <linux/clk.h>
 #include <linux/delay.h>
-#include <linux/sysdev.h>
+#include <linux/device.h>
 #include <linux/syscore_ops.h>
 #include <linux/serial_core.h>
 #include <linux/platform_device.h>
@@ -220,25 +220,26 @@
 	s3c2412_baseclk_add();
 }
 
-/* need to register class before we actually register the device, and
+/* need to register the subsystem before we actually register the device, and
  * we also need to ensure that it has been initialised before any of the
  * drivers even try to use it (even if not on an s3c2412 based system)
  * as a driver which may support both 2410 and 2440 may try and use it.
 */
 
-struct sysdev_class s3c2412_sysclass = {
+struct bus_type s3c2412_subsys = {
 	.name = "s3c2412-core",
+	.dev_name = "s3c2412-core",
 };
 
 static int __init s3c2412_core_init(void)
 {
-	return sysdev_class_register(&s3c2412_sysclass);
+	return subsys_system_register(&s3c2412_subsys, NULL);
 }
 
 core_initcall(s3c2412_core_init);
 
-static struct sys_device s3c2412_sysdev = {
-	.cls		= &s3c2412_sysclass,
+static struct device s3c2412_dev = {
+	.bus		= &s3c2412_subsys,
 };
 
 int __init s3c2412_init(void)
@@ -250,5 +251,5 @@
 #endif
 	register_syscore_ops(&s3c24xx_irq_syscore_ops);
 
-	return sysdev_register(&s3c2412_sysdev);
+	return device_register(&s3c2412_dev);
 }
diff --git a/arch/arm/mach-s3c2416/irq.c b/arch/arm/mach-s3c2416/irq.c
index 28ad20d..36df761 100644
--- a/arch/arm/mach-s3c2416/irq.c
+++ b/arch/arm/mach-s3c2416/irq.c
@@ -25,7 +25,7 @@
 #include <linux/module.h>
 #include <linux/interrupt.h>
 #include <linux/ioport.h>
-#include <linux/sysdev.h>
+#include <linux/device.h>
 #include <linux/io.h>
 
 #include <mach/hardware.h>
@@ -213,7 +213,7 @@
 	return 0;
 }
 
-static int __init s3c2416_irq_add(struct sys_device *sysdev)
+static int __init s3c2416_irq_add(struct device *dev)
 {
 	printk(KERN_INFO "S3C2416: IRQ Support\n");
 
@@ -234,13 +234,15 @@
 	return 0;
 }
 
-static struct sysdev_driver s3c2416_irq_driver = {
-	.add		= s3c2416_irq_add,
+static struct subsys_interface s3c2416_irq_interface = {
+	.name		= "s3c2416_irq",
+	.subsys		= &s3c2416_subsys,
+	.add_dev	= s3c2416_irq_add,
 };
 
 static int __init s3c2416_irq_init(void)
 {
-	return sysdev_driver_register(&s3c2416_sysclass, &s3c2416_irq_driver);
+	return subsys_interface_register(&s3c2416_irq_interface);
 }
 
 arch_initcall(s3c2416_irq_init);
diff --git a/arch/arm/mach-s3c2416/pm.c b/arch/arm/mach-s3c2416/pm.c
index 9ec54f1..3bdb15a 100644
--- a/arch/arm/mach-s3c2416/pm.c
+++ b/arch/arm/mach-s3c2416/pm.c
@@ -10,7 +10,7 @@
  * published by the Free Software Foundation.
 */
 
-#include <linux/sysdev.h>
+#include <linux/device.h>
 #include <linux/syscore_ops.h>
 #include <linux/io.h>
 
@@ -48,7 +48,7 @@
 	__raw_writel(virt_to_phys(s3c_cpu_resume), S3C2412_INFORM1);
 }
 
-static int s3c2416_pm_add(struct sys_device *sysdev)
+static int s3c2416_pm_add(struct device *dev)
 {
 	pm_cpu_prep = s3c2416_pm_prepare;
 	pm_cpu_sleep = s3c2416_cpu_suspend;
@@ -56,13 +56,15 @@
 	return 0;
 }
 
-static struct sysdev_driver s3c2416_pm_driver = {
-	.add		= s3c2416_pm_add,
+static struct subsys_interface s3c2416_pm_interface = {
+	.name		= "s3c2416_pm",
+	.subsys		= &s3c2416_subsys,
+	.add_dev	= s3c2416_pm_add,
 };
 
 static __init int s3c2416_pm_init(void)
 {
-	return sysdev_driver_register(&s3c2416_sysclass, &s3c2416_pm_driver);
+	return subsys_interface_register(&s3c2416_pm_interface);
 }
 
 arch_initcall(s3c2416_pm_init);
diff --git a/arch/arm/mach-s3c2416/s3c2416.c b/arch/arm/mach-s3c2416/s3c2416.c
index ee214bc..143db90 100644
--- a/arch/arm/mach-s3c2416/s3c2416.c
+++ b/arch/arm/mach-s3c2416/s3c2416.c
@@ -31,7 +31,7 @@
 #include <linux/gpio.h>
 #include <linux/platform_device.h>
 #include <linux/serial_core.h>
-#include <linux/sysdev.h>
+#include <linux/device.h>
 #include <linux/syscore_ops.h>
 #include <linux/clk.h>
 #include <linux/io.h>
@@ -68,12 +68,13 @@
 	IODESC_ENT(TIMER),
 };
 
-struct sysdev_class s3c2416_sysclass = {
+struct bus_type s3c2416_subsys = {
 	.name = "s3c2416-core",
+	.dev_name = "s3c2416-core",
 };
 
-static struct sys_device s3c2416_sysdev = {
-	.cls		= &s3c2416_sysclass,
+static struct device s3c2416_dev = {
+	.bus		= &s3c2416_subsys,
 };
 
 static void s3c2416_hard_reset(void)
@@ -105,7 +106,7 @@
 #endif
 	register_syscore_ops(&s3c24xx_irq_syscore_ops);
 
-	return sysdev_register(&s3c2416_sysdev);
+	return device_register(&s3c2416_dev);
 }
 
 void __init s3c2416_init_uarts(struct s3c2410_uartcfg *cfg, int no)
@@ -133,7 +134,7 @@
 	iotable_init(s3c2416_iodesc, ARRAY_SIZE(s3c2416_iodesc));
 }
 
-/* need to register class before we actually register the device, and
+/* need to register the subsystem before we actually register the device, and
  * we also need to ensure that it has been initialised before any of the
  * drivers even try to use it (even if not on an s3c2416 based system)
  * as a driver which may support both 2443 and 2440 may try and use it.
@@ -141,7 +142,7 @@
 
 static int __init s3c2416_core_init(void)
 {
-	return sysdev_class_register(&s3c2416_sysclass);
+	return subsys_system_register(&s3c2416_subsys, NULL);
 }
 
 core_initcall(s3c2416_core_init);
diff --git a/arch/arm/mach-s3c2440/clock.c b/arch/arm/mach-s3c2440/clock.c
index f9e6bda..d895759 100644
--- a/arch/arm/mach-s3c2440/clock.c
+++ b/arch/arm/mach-s3c2440/clock.c
@@ -28,7 +28,6 @@
 #include <linux/errno.h>
 #include <linux/err.h>
 #include <linux/device.h>
-#include <linux/sysdev.h>
 #include <linux/interrupt.h>
 #include <linux/ioport.h>
 #include <linux/mutex.h>
@@ -108,7 +107,7 @@
 	.ctrlbit	= S3C2440_CLKCON_CAMERA,
 };
 
-static int s3c2440_clk_add(struct sys_device *sysdev)
+static int s3c2440_clk_add(struct device *dev)
 {
 	struct clk *clock_upll;
 	struct clk *clock_h;
@@ -137,13 +136,15 @@
 	return 0;
 }
 
-static struct sysdev_driver s3c2440_clk_driver = {
-	.add	= s3c2440_clk_add,
+static struct subsys_interface s3c2440_clk_interface = {
+	.name		= "s3c2440_clk",
+	.subsys		= &s3c2440_subsys,
+	.add_dev	= s3c2440_clk_add,
 };
 
-static __init int s3c24xx_clk_driver(void)
+static __init int s3c24xx_clk_init(void)
 {
-	return sysdev_driver_register(&s3c2440_sysclass, &s3c2440_clk_driver);
+	return subsys_interface_register(&s3c2440_clk_interface);
 }
 
-arch_initcall(s3c24xx_clk_driver);
+arch_initcall(s3c24xx_clk_init);
diff --git a/arch/arm/mach-s3c2440/dma.c b/arch/arm/mach-s3c2440/dma.c
index 0e73f8f..15b1ddf 100644
--- a/arch/arm/mach-s3c2440/dma.c
+++ b/arch/arm/mach-s3c2440/dma.c
@@ -14,7 +14,7 @@
 
 #include <linux/kernel.h>
 #include <linux/init.h>
-#include <linux/sysdev.h>
+#include <linux/device.h>
 #include <linux/serial_core.h>
 
 #include <mach/map.h>
@@ -174,20 +174,22 @@
 	},
 };
 
-static int __init s3c2440_dma_add(struct sys_device *sysdev)
+static int __init s3c2440_dma_add(struct device *dev)
 {
 	s3c2410_dma_init();
 	s3c24xx_dma_order_set(&s3c2440_dma_order);
 	return s3c24xx_dma_init_map(&s3c2440_dma_sel);
 }
 
-static struct sysdev_driver s3c2440_dma_driver = {
-	.add	= s3c2440_dma_add,
+static struct subsys_interface s3c2440_dma_interface = {
+	.name		= "s3c2440_dma",
+	.subsys		= &s3c2440_subsys,
+	.add_dev	= s3c2440_dma_add,
 };
 
 static int __init s3c2440_dma_init(void)
 {
-	return sysdev_driver_register(&s3c2440_sysclass, &s3c2440_dma_driver);
+	return subsys_interface_register(&s3c2440_dma_interface);
 }
 
 arch_initcall(s3c2440_dma_init);
diff --git a/arch/arm/mach-s3c2440/irq.c b/arch/arm/mach-s3c2440/irq.c
index eb1cc0f..4fee9bc 100644
--- a/arch/arm/mach-s3c2440/irq.c
+++ b/arch/arm/mach-s3c2440/irq.c
@@ -23,7 +23,7 @@
 #include <linux/module.h>
 #include <linux/interrupt.h>
 #include <linux/ioport.h>
-#include <linux/sysdev.h>
+#include <linux/device.h>
 #include <linux/io.h>
 
 #include <mach/hardware.h>
@@ -92,7 +92,7 @@
 	.irq_ack	= s3c_irq_wdtac97_ack,
 };
 
-static int s3c2440_irq_add(struct sys_device *sysdev)
+static int s3c2440_irq_add(struct device *dev)
 {
 	unsigned int irqno;
 
@@ -113,13 +113,15 @@
 	return 0;
 }
 
-static struct sysdev_driver s3c2440_irq_driver = {
-	.add		= s3c2440_irq_add,
+static struct subsys_interface s3c2440_irq_interface = {
+	.name		= "s3c2440_irq",
+	.subsys		= &s3c2440_subsys,
+	.add_dev	= s3c2440_irq_add,
 };
 
 static int s3c2440_irq_init(void)
 {
-	return sysdev_driver_register(&s3c2440_sysclass, &s3c2440_irq_driver);
+	return subsys_interface_register(&s3c2440_irq_interface);
 }
 
 arch_initcall(s3c2440_irq_init);
diff --git a/arch/arm/mach-s3c2440/s3c2440-cpufreq.c b/arch/arm/mach-s3c2440/s3c2440-cpufreq.c
index 976002f..cf75966 100644
--- a/arch/arm/mach-s3c2440/s3c2440-cpufreq.c
+++ b/arch/arm/mach-s3c2440/s3c2440-cpufreq.c
@@ -17,7 +17,7 @@
 #include <linux/interrupt.h>
 #include <linux/ioport.h>
 #include <linux/cpufreq.h>
-#include <linux/sysdev.h>
+#include <linux/device.h>
 #include <linux/delay.h>
 #include <linux/clk.h>
 #include <linux/err.h>
@@ -270,7 +270,7 @@
 	.debug_io_show  = s3c_cpufreq_debugfs_call(s3c2410_iotiming_debugfs),
 };
 
-static int s3c2440_cpufreq_add(struct sys_device *sysdev)
+static int s3c2440_cpufreq_add(struct device *dev)
 {
 	xtal = s3c_cpufreq_clk_get(NULL, "xtal");
 	hclk = s3c_cpufreq_clk_get(NULL, "hclk");
@@ -285,27 +285,29 @@
 	return s3c_cpufreq_register(&s3c2440_cpufreq_info);
 }
 
-static struct sysdev_driver s3c2440_cpufreq_driver = {
-	.add		= s3c2440_cpufreq_add,
+static struct subsys_interface s3c2440_cpufreq_interface = {
+	.name		= "s3c2440_cpufreq",
+	.subsys		= &s3c2440_subsys,
+	.add_dev	= s3c2440_cpufreq_add,
 };
 
 static int s3c2440_cpufreq_init(void)
 {
-	return sysdev_driver_register(&s3c2440_sysclass,
-				      &s3c2440_cpufreq_driver);
+	return subsys_interface_register(&s3c2440_cpufreq_interface);
 }
 
 /* arch_initcall adds the clocks we need, so use subsys_initcall. */
 subsys_initcall(s3c2440_cpufreq_init);
 
-static struct sysdev_driver s3c2442_cpufreq_driver = {
-	.add		= s3c2440_cpufreq_add,
+static struct subsys_interface s3c2442_cpufreq_interface = {
+	.name		= "s3c2442_cpufreq",
+	.subsys		= &s3c2442_subsys,
+	.add_dev	= s3c2440_cpufreq_add,
 };
 
 static int s3c2442_cpufreq_init(void)
 {
-	return sysdev_driver_register(&s3c2442_sysclass,
-				      &s3c2442_cpufreq_driver);
+	return subsys_interface_register(&s3c2442_cpufreq_interface);
 }
 
 subsys_initcall(s3c2442_cpufreq_init);
diff --git a/arch/arm/mach-s3c2440/s3c2440-pll-12000000.c b/arch/arm/mach-s3c2440/s3c2440-pll-12000000.c
index f105d5e..b5368ae 100644
--- a/arch/arm/mach-s3c2440/s3c2440-pll-12000000.c
+++ b/arch/arm/mach-s3c2440/s3c2440-pll-12000000.c
@@ -14,7 +14,7 @@
 
 #include <linux/types.h>
 #include <linux/kernel.h>
-#include <linux/sysdev.h>
+#include <linux/device.h>
 #include <linux/clk.h>
 #include <linux/err.h>
 
@@ -51,7 +51,7 @@
 	{ .frequency = 400000000,	.index = PLLVAL(0x5c, 1, 1),  }, 	/* FVco 800.000000 */
 };
 
-static int s3c2440_plls12_add(struct sys_device *dev)
+static int s3c2440_plls12_add(struct device *dev)
 {
 	struct clk *xtal_clk;
 	unsigned long xtal;
@@ -72,25 +72,29 @@
 	return 0;
 }
 
-static struct sysdev_driver s3c2440_plls12_drv = {
-	.add	= s3c2440_plls12_add,
+static struct subsys_interface s3c2440_plls12_interface = {
+	.name		= "s3c2440_plls12",
+	.subsys		= &s3c2440_subsys,
+	.add_dev	= s3c2440_plls12_add,
 };
 
 static int __init s3c2440_pll_12mhz(void)
 {
-	return sysdev_driver_register(&s3c2440_sysclass, &s3c2440_plls12_drv);
+	return subsys_interface_register(&s3c2440_plls12_interface);
 
 }
 
 arch_initcall(s3c2440_pll_12mhz);
 
-static struct sysdev_driver s3c2442_plls12_drv = {
-	.add	= s3c2440_plls12_add,
+static struct subsys_interface s3c2442_plls12_interface = {
+	.name		= "s3c2442_plls12",
+	.subsys		= &s3c2442_subsys,
+	.add_dev	= s3c2440_plls12_add,
 };
 
 static int __init s3c2442_pll_12mhz(void)
 {
-	return sysdev_driver_register(&s3c2442_sysclass, &s3c2442_plls12_drv);
+	return subsys_interface_register(&s3c2442_plls12_interface);
 
 }
 
diff --git a/arch/arm/mach-s3c2440/s3c2440-pll-16934400.c b/arch/arm/mach-s3c2440/s3c2440-pll-16934400.c
index c8a8f90..42f2b5c 100644
--- a/arch/arm/mach-s3c2440/s3c2440-pll-16934400.c
+++ b/arch/arm/mach-s3c2440/s3c2440-pll-16934400.c
@@ -14,7 +14,7 @@
 
 #include <linux/types.h>
 #include <linux/kernel.h>
-#include <linux/sysdev.h>
+#include <linux/device.h>
 #include <linux/clk.h>
 #include <linux/err.h>
 
@@ -79,7 +79,7 @@
 	{ .frequency = 402192000,	.index = PLLVAL(87, 2, 1), 	}, 	/* FVco 804.384000 */
 };
 
-static int s3c2440_plls169344_add(struct sys_device *dev)
+static int s3c2440_plls169344_add(struct device *dev)
 {
 	struct clk *xtal_clk;
 	unsigned long xtal;
@@ -100,28 +100,28 @@
 	return 0;
 }
 
-static struct sysdev_driver s3c2440_plls169344_drv = {
-	.add	= s3c2440_plls169344_add,
+static struct subsys_interface s3c2440_plls169344_interface = {
+	.name		= "s3c2440_plls169344",
+	.subsys		= &s3c2440_subsys,
+	.add_dev	= s3c2440_plls169344_add,
 };
 
 static int __init s3c2440_pll_16934400(void)
 {
-	return sysdev_driver_register(&s3c2440_sysclass,
-				      &s3c2440_plls169344_drv);
-
+	return subsys_interface_register(&s3c2440_plls169344_interface);
 }
 
 arch_initcall(s3c2440_pll_16934400);
 
-static struct sysdev_driver s3c2442_plls169344_drv = {
-	.add	= s3c2440_plls169344_add,
+static struct subsys_interface s3c2442_plls169344_interface = {
+	.name		= "s3c2442_plls169344",
+	.subsys		= &s3c2442_subsys,
+	.add_dev	= s3c2440_plls169344_add,
 };
 
 static int __init s3c2442_pll_16934400(void)
 {
-	return sysdev_driver_register(&s3c2442_sysclass,
-				      &s3c2442_plls169344_drv);
-
+	return subsys_interface_register(&s3c2442_plls169344_interface);
 }
 
 arch_initcall(s3c2442_pll_16934400);
diff --git a/arch/arm/mach-s3c2440/s3c2440.c b/arch/arm/mach-s3c2440/s3c2440.c
index 37f8cc6..2b3dddb 100644
--- a/arch/arm/mach-s3c2440/s3c2440.c
+++ b/arch/arm/mach-s3c2440/s3c2440.c
@@ -18,7 +18,7 @@
 #include <linux/init.h>
 #include <linux/platform_device.h>
 #include <linux/serial_core.h>
-#include <linux/sysdev.h>
+#include <linux/device.h>
 #include <linux/syscore_ops.h>
 #include <linux/gpio.h>
 #include <linux/clk.h>
@@ -40,8 +40,8 @@
 #include <plat/gpio-cfg.h>
 #include <plat/gpio-cfg-helpers.h>
 
-static struct sys_device s3c2440_sysdev = {
-	.cls		= &s3c2440_sysclass,
+static struct device s3c2440_dev = {
+	.bus		= &s3c2440_subsys,
 };
 
 int __init s3c2440_init(void)
@@ -63,7 +63,7 @@
 
 	/* register our system device for everything else */
 
-	return sysdev_register(&s3c2440_sysdev);
+	return device_register(&s3c2440_dev);
 }
 
 void __init s3c2440_map_io(void)
diff --git a/arch/arm/mach-s3c2440/s3c2442.c b/arch/arm/mach-s3c2440/s3c2442.c
index 2c822e0..9ab15cd 100644
--- a/arch/arm/mach-s3c2440/s3c2442.c
+++ b/arch/arm/mach-s3c2440/s3c2442.c
@@ -28,7 +28,6 @@
 #include <linux/errno.h>
 #include <linux/err.h>
 #include <linux/device.h>
-#include <linux/sysdev.h>
 #include <linux/syscore_ops.h>
 #include <linux/interrupt.h>
 #include <linux/ioport.h>
@@ -123,7 +122,7 @@
 	},
 };
 
-static int s3c2442_clk_add(struct sys_device *sysdev)
+static int s3c2442_clk_add(struct device *dev)
 {
 	struct clk *clock_upll;
 	struct clk *clock_h;
@@ -149,20 +148,22 @@
 	return 0;
 }
 
-static struct sysdev_driver s3c2442_clk_driver = {
-	.add	= s3c2442_clk_add,
+static struct subsys_interface s3c2442_clk_interface = {
+	.name		= "s3c2442_clk",
+	.subsys		= &s3c2442_subsys,
+	.add_dev	 s3c2442_clk_add,
 };
 
 static __init int s3c2442_clk_init(void)
 {
-	return sysdev_driver_register(&s3c2442_sysclass, &s3c2442_clk_driver);
+	return subsys_interface_register(&s3c2442_clk_interface);
 }
 
 arch_initcall(s3c2442_clk_init);
 
 
-static struct sys_device s3c2442_sysdev = {
-	.cls		= &s3c2442_sysclass,
+static struct device s3c2442_dev = {
+	.bus		= &s3c2442_subsys,
 };
 
 int __init s3c2442_init(void)
@@ -175,7 +176,7 @@
 	register_syscore_ops(&s3c244x_pm_syscore_ops);
 	register_syscore_ops(&s3c24xx_irq_syscore_ops);
 
-	return sysdev_register(&s3c2442_sysdev);
+	return device_register(&s3c2442_dev);
 }
 
 void __init s3c2442_map_io(void)
diff --git a/arch/arm/mach-s3c2440/s3c244x-clock.c b/arch/arm/mach-s3c2440/s3c244x-clock.c
index 7f5ea0a..b3fdbdd 100644
--- a/arch/arm/mach-s3c2440/s3c244x-clock.c
+++ b/arch/arm/mach-s3c2440/s3c244x-clock.c
@@ -28,7 +28,6 @@
 #include <linux/errno.h>
 #include <linux/err.h>
 #include <linux/device.h>
-#include <linux/sysdev.h>
 #include <linux/interrupt.h>
 #include <linux/ioport.h>
 #include <linux/clk.h>
@@ -73,7 +72,7 @@
 	},
 };
 
-static int s3c244x_clk_add(struct sys_device *sysdev)
+static int s3c244x_clk_add(struct device *dev)
 {
 	unsigned long camdivn = __raw_readl(S3C2440_CAMDIVN);
 	unsigned long clkdivn;
@@ -115,24 +114,28 @@
 	return 0;
 }
 
-static struct sysdev_driver s3c2440_clk_driver = {
-	.add		= s3c244x_clk_add,
+static struct subsys_interface s3c2440_clk_interface = {
+	.name		= "s3c2440_clk",
+	.subsys		= &s3c2440_subsys,
+	.add_dev	= s3c244x_clk_add,
 };
 
 static int s3c2440_clk_init(void)
 {
-	return sysdev_driver_register(&s3c2440_sysclass, &s3c2440_clk_driver);
+	return subsys_interface_register(&s3c2440_clk_interface);
 }
 
 arch_initcall(s3c2440_clk_init);
 
-static struct sysdev_driver s3c2442_clk_driver = {
-	.add		= s3c244x_clk_add,
+static struct subsys_interface s3c2442_clk_interface = {
+	.name		= "s3c2442_clk",
+	.subsys		= &s3c2442_subsys,
+	.add_dev	= s3c244x_clk_add,
 };
 
 static int s3c2442_clk_init(void)
 {
-	return sysdev_driver_register(&s3c2442_sysclass, &s3c2442_clk_driver);
+	return subsys_interface_register(&s3c2442_clk_interface);
 }
 
 arch_initcall(s3c2442_clk_init);
diff --git a/arch/arm/mach-s3c2440/s3c244x-irq.c b/arch/arm/mach-s3c2440/s3c244x-irq.c
index c63e8f2..74d3dcf 100644
--- a/arch/arm/mach-s3c2440/s3c244x-irq.c
+++ b/arch/arm/mach-s3c2440/s3c244x-irq.c
@@ -23,7 +23,7 @@
 #include <linux/module.h>
 #include <linux/interrupt.h>
 #include <linux/ioport.h>
-#include <linux/sysdev.h>
+#include <linux/device.h>
 #include <linux/io.h>
 
 #include <mach/hardware.h>
@@ -91,7 +91,7 @@
 	.irq_ack	= s3c_irq_cam_ack,
 };
 
-static int s3c244x_irq_add(struct sys_device *sysdev)
+static int s3c244x_irq_add(struct device *dev)
 {
 	unsigned int irqno;
 
@@ -114,25 +114,29 @@
 	return 0;
 }
 
-static struct sysdev_driver s3c2440_irq_driver = {
-	.add		= s3c244x_irq_add,
+static struct subsys_interface s3c2440_irq_interface = {
+	.name		= "s3c2440_irq",
+	.subsys		= &s3c2440_subsys,
+	.add_dev	= s3c244x_irq_add,
 };
 
 static int s3c2440_irq_init(void)
 {
-	return sysdev_driver_register(&s3c2440_sysclass, &s3c2440_irq_driver);
+	return subsys_interface_register(&s3c2440_irq_interface);
 }
 
 arch_initcall(s3c2440_irq_init);
 
-static struct sysdev_driver s3c2442_irq_driver = {
-	.add		= s3c244x_irq_add,
+static struct subsys_interface s3c2442_irq_interface = {
+	.name		= "s3c2442_irq",
+	.subsys		= &s3c2442_subsys,
+	.add_dev	= s3c244x_irq_add,
 };
 
 
 static int s3c2442_irq_init(void)
 {
-	return sysdev_driver_register(&s3c2442_sysclass, &s3c2442_irq_driver);
+	return subsys_interface_register(&s3c2442_irq_interface);
 }
 
 arch_initcall(s3c2442_irq_init);
diff --git a/arch/arm/mach-s3c2440/s3c244x.c b/arch/arm/mach-s3c2440/s3c244x.c
index 7e8a23d..36bc60f 100644
--- a/arch/arm/mach-s3c2440/s3c244x.c
+++ b/arch/arm/mach-s3c2440/s3c244x.c
@@ -18,7 +18,7 @@
 #include <linux/init.h>
 #include <linux/serial_core.h>
 #include <linux/platform_device.h>
-#include <linux/sysdev.h>
+#include <linux/device.h>
 #include <linux/syscore_ops.h>
 #include <linux/clk.h>
 #include <linux/io.h>
@@ -135,17 +135,19 @@
 	s3c2410_baseclk_add();
 }
 
-/* Since the S3C2442 and S3C2440 share  items, put both sysclasses here */
+/* Since the S3C2442 and S3C2440 share items, put both subsystems here */
 
-struct sysdev_class s3c2440_sysclass = {
+struct bus_type s3c2440_subsys = {
 	.name		= "s3c2440-core",
+	.dev_name	= "s3c2440-core",
 };
 
-struct sysdev_class s3c2442_sysclass = {
+struct bus_type s3c2442_subsys = {
 	.name		= "s3c2442-core",
+	.dev_name	= "s3c2442-core",
 };
 
-/* need to register class before we actually register the device, and
+/* need to register the subsystem before we actually register the device, and
  * we also need to ensure that it has been initialised before any of the
  * drivers even try to use it (even if not on an s3c2440 based system)
  * as a driver which may support both 2410 and 2440 may try and use it.
@@ -153,14 +155,14 @@
 
 static int __init s3c2440_core_init(void)
 {
-	return sysdev_class_register(&s3c2440_sysclass);
+	return subsys_system_register(&s3c2440_subsys, NULL);
 }
 
 core_initcall(s3c2440_core_init);
 
 static int __init s3c2442_core_init(void)
 {
-	return sysdev_class_register(&s3c2442_sysclass);
+	return subsys_system_register(&s3c2442_subsys, NULL);
 }
 
 core_initcall(s3c2442_core_init);
diff --git a/arch/arm/mach-s3c2443/dma.c b/arch/arm/mach-s3c2443/dma.c
index fe52151..de6b4a2 100644
--- a/arch/arm/mach-s3c2443/dma.c
+++ b/arch/arm/mach-s3c2443/dma.c
@@ -14,7 +14,7 @@
 
 #include <linux/kernel.h>
 #include <linux/init.h>
-#include <linux/sysdev.h>
+#include <linux/device.h>
 #include <linux/serial_core.h>
 #include <linux/io.h>
 
@@ -135,19 +135,21 @@
 	.map_size	= ARRAY_SIZE(s3c2443_dma_mappings),
 };
 
-static int __init s3c2443_dma_add(struct sys_device *sysdev)
+static int __init s3c2443_dma_add(struct device *dev)
 {
 	s3c24xx_dma_init(6, IRQ_S3C2443_DMA0, 0x100);
 	return s3c24xx_dma_init_map(&s3c2443_dma_sel);
 }
 
-static struct sysdev_driver s3c2443_dma_driver = {
-	.add	= s3c2443_dma_add,
+static struct subsys_interface s3c2443_dma_interface = {
+	.name		= "s3c2443_dma",
+	.subsys		= &s3c2443_subsys,
+	.add_dev	= s3c2443_dma_add,
 };
 
 static int __init s3c2443_dma_init(void)
 {
-	return sysdev_driver_register(&s3c2443_sysclass, &s3c2443_dma_driver);
+	return subsys_interface_register(&s3c2443_dma_interface);
 }
 
 arch_initcall(s3c2443_dma_init);
diff --git a/arch/arm/mach-s3c2443/irq.c b/arch/arm/mach-s3c2443/irq.c
index 83ecb11..35e4ff2 100644
--- a/arch/arm/mach-s3c2443/irq.c
+++ b/arch/arm/mach-s3c2443/irq.c
@@ -23,7 +23,7 @@
 #include <linux/module.h>
 #include <linux/interrupt.h>
 #include <linux/ioport.h>
-#include <linux/sysdev.h>
+#include <linux/device.h>
 #include <linux/io.h>
 
 #include <mach/hardware.h>
@@ -241,7 +241,7 @@
 	return 0;
 }
 
-static int __init s3c2443_irq_add(struct sys_device *sysdev)
+static int __init s3c2443_irq_add(struct device *dev)
 {
 	printk("S3C2443: IRQ Support\n");
 
@@ -265,13 +265,15 @@
 	return 0;
 }
 
-static struct sysdev_driver s3c2443_irq_driver = {
-	.add		= s3c2443_irq_add,
+static struct subsys_interface s3c2443_irq_interface = {
+	.name		= "s3c2443_irq",
+	.subsys		= &s3c2443_subsys,
+	.add_dev	= s3c2443_irq_add,
 };
 
 static int __init s3c2443_irq_init(void)
 {
-	return sysdev_driver_register(&s3c2443_sysclass, &s3c2443_irq_driver);
+	return subsys_interface_register(&s3c2443_irq_interface);
 }
 
 arch_initcall(s3c2443_irq_init);
diff --git a/arch/arm/mach-s3c2443/s3c2443.c b/arch/arm/mach-s3c2443/s3c2443.c
index a22b771..aa90ae4 100644
--- a/arch/arm/mach-s3c2443/s3c2443.c
+++ b/arch/arm/mach-s3c2443/s3c2443.c
@@ -19,7 +19,7 @@
 #include <linux/gpio.h>
 #include <linux/platform_device.h>
 #include <linux/serial_core.h>
-#include <linux/sysdev.h>
+#include <linux/device.h>
 #include <linux/clk.h>
 #include <linux/io.h>
 
@@ -49,12 +49,13 @@
 	IODESC_ENT(TIMER),
 };
 
-struct sysdev_class s3c2443_sysclass = {
+struct bus_type s3c2443_subsys = {
 	.name = "s3c2443-core",
+	.dev_name = "s3c2443-core",
 };
 
-static struct sys_device s3c2443_sysdev = {
-	.cls		= &s3c2443_sysclass,
+static struct device s3c2443_dev = {
+	.bus		= &s3c2443_subsys,
 };
 
 static void s3c2443_hard_reset(void)
@@ -77,7 +78,7 @@
 	s3c_device_wdt.resource[1].start = IRQ_S3C2443_WDT;
 	s3c_device_wdt.resource[1].end   = IRQ_S3C2443_WDT;
 
-	return sysdev_register(&s3c2443_sysdev);
+	return device_register(&s3c2443_dev);
 }
 
 void __init s3c2443_init_uarts(struct s3c2410_uartcfg *cfg, int no)
@@ -99,7 +100,7 @@
 	iotable_init(s3c2443_iodesc, ARRAY_SIZE(s3c2443_iodesc));
 }
 
-/* need to register class before we actually register the device, and
+/* need to register the subsystem before we actually register the device, and
  * we also need to ensure that it has been initialised before any of the
  * drivers even try to use it (even if not on an s3c2443 based system)
  * as a driver which may support both 2443 and 2440 may try and use it.
@@ -107,7 +108,7 @@
 
 static int __init s3c2443_core_init(void)
 {
-	return sysdev_class_register(&s3c2443_sysclass);
+	return subsys_system_register(&s3c2443_subsys, NULL);
 }
 
 core_initcall(s3c2443_core_init);
diff --git a/arch/arm/mach-s3c64xx/cpu.c b/arch/arm/mach-s3c64xx/cpu.c
index de085b7..0f8a669 100644
--- a/arch/arm/mach-s3c64xx/cpu.c
+++ b/arch/arm/mach-s3c64xx/cpu.c
@@ -16,7 +16,7 @@
 #include <linux/module.h>
 #include <linux/interrupt.h>
 #include <linux/ioport.h>
-#include <linux/sysdev.h>
+#include <linux/device.h>
 #include <linux/serial_core.h>
 #include <linux/platform_device.h>
 #include <linux/io.h>
@@ -122,12 +122,13 @@
 };
 
 
-struct sysdev_class s3c64xx_sysclass = {
-	.name	= "s3c64xx-core",
+struct bus_type s3c64xx_subsys = {
+	.name		= "s3c64xx-core",
+	.dev_name	= "s3c64xx-core",
 };
 
-static struct sys_device s3c64xx_sysdev = {
-	.cls	= &s3c64xx_sysclass,
+static struct device s3c64xx_dev = {
+	.bus	= &s3c64xx_subsys,
 };
 
 /* uart registration process */
@@ -152,10 +153,10 @@
 	s3c_init_cpu(samsung_cpu_id, cpu_ids, ARRAY_SIZE(cpu_ids));
 }
 
-static __init int s3c64xx_sysdev_init(void)
+static __init int s3c64xx_dev_init(void)
 {
-	sysdev_class_register(&s3c64xx_sysclass);
-	return sysdev_register(&s3c64xx_sysdev);
+	subsys_system_register(&s3c64xx_subsys, NULL);
+	return device_register(&s3c64xx_dev);
 }
 
-core_initcall(s3c64xx_sysdev_init);
+core_initcall(s3c64xx_dev_init);
diff --git a/arch/arm/mach-s3c64xx/dma.c b/arch/arm/mach-s3c64xx/dma.c
index 17d62f4..f2a7a17 100644
--- a/arch/arm/mach-s3c64xx/dma.c
+++ b/arch/arm/mach-s3c64xx/dma.c
@@ -16,7 +16,7 @@
 #include <linux/module.h>
 #include <linux/interrupt.h>
 #include <linux/dmapool.h>
-#include <linux/sysdev.h>
+#include <linux/device.h>
 #include <linux/errno.h>
 #include <linux/slab.h>
 #include <linux/delay.h>
@@ -35,7 +35,7 @@
 /* dma channel state information */
 
 struct s3c64xx_dmac {
-	struct sys_device	 sysdev;
+	struct device		dev;
 	struct clk		*clk;
 	void __iomem		*regs;
 	struct s3c2410_dma_chan *channels;
@@ -631,8 +631,9 @@
 	return IRQ_HANDLED;
 }
 
-static struct sysdev_class dma_sysclass = {
+static struct bus_type dma_subsys = {
 	.name		= "s3c64xx-dma",
+	.dev_name	= "s3c64xx-dma",
 };
 
 static int s3c64xx_dma_init1(int chno, enum dma_ch chbase,
@@ -651,12 +652,12 @@
 		return -ENOMEM;
 	}
 
-	dmac->sysdev.id = chno / 8;
-	dmac->sysdev.cls = &dma_sysclass;
+	dmac->dev.id = chno / 8;
+	dmac->dev.bus = &dma_subsys;
 
-	err = sysdev_register(&dmac->sysdev);
+	err = device_register(&dmac->dev);
 	if (err) {
-		printk(KERN_ERR "%s: failed to register sysdevice\n", __func__);
+		printk(KERN_ERR "%s: failed to register device\n", __func__);
 		goto err_alloc;
 	}
 
@@ -667,7 +668,7 @@
 		goto err_dev;
 	}
 
-	snprintf(clkname, sizeof(clkname), "dma%d", dmac->sysdev.id);
+	snprintf(clkname, sizeof(clkname), "dma%d", dmac->dev.id);
 
 	dmac->clk = clk_get(NULL, clkname);
 	if (IS_ERR(dmac->clk)) {
@@ -715,7 +716,7 @@
 err_map:
 	iounmap(regs);
 err_dev:
-	sysdev_unregister(&dmac->sysdev);
+	device_unregister(&dmac->dev);
 err_alloc:
 	kfree(dmac);
 	return err;
@@ -733,9 +734,9 @@
 		return -ENOMEM;
 	}
 
-	ret = sysdev_class_register(&dma_sysclass);
+	ret = subsys_system_register(&dma_subsys, NULL);
 	if (ret) {
-		printk(KERN_ERR "%s: failed to create sysclass\n", __func__);
+		printk(KERN_ERR "%s: failed to create subsys\n", __func__);
 		return -ENOMEM;
 	}
 
diff --git a/arch/arm/mach-s3c64xx/s3c6400.c b/arch/arm/mach-s3c64xx/s3c6400.c
index 7a3bc32..691a7ca 100644
--- a/arch/arm/mach-s3c64xx/s3c6400.c
+++ b/arch/arm/mach-s3c64xx/s3c6400.c
@@ -17,7 +17,7 @@
 #include <linux/init.h>
 #include <linux/clk.h>
 #include <linux/io.h>
-#include <linux/sysdev.h>
+#include <linux/device.h>
 #include <linux/serial_core.h>
 #include <linux/platform_device.h>
 
@@ -70,17 +70,18 @@
 	s3c64xx_init_irq(~0 & ~(0xf << 5), ~0);
 }
 
-struct sysdev_class s3c6400_sysclass = {
-	.name	= "s3c6400-core",
+static struct bus_type s3c6400_subsys = {
+	.name		= "s3c6400-core",
+	.dev_name	= "s3c6400-core",
 };
 
-static struct sys_device s3c6400_sysdev = {
-	.cls	= &s3c6400_sysclass,
+static struct device s3c6400_dev = {
+	.bus	= &s3c6400_subsys,
 };
 
 static int __init s3c6400_core_init(void)
 {
-	return sysdev_class_register(&s3c6400_sysclass);
+	return subsys_system_register(&s3c6400_subsys, NULL);
 }
 
 core_initcall(s3c6400_core_init);
@@ -89,5 +90,5 @@
 {
 	printk("S3C6400: Initialising architecture\n");
 
-	return sysdev_register(&s3c6400_sysdev);
+	return device_register(&s3c6400_dev);
 }
diff --git a/arch/arm/mach-s3c64xx/s3c6410.c b/arch/arm/mach-s3c64xx/s3c6410.c
index 4117003..9a5484a 100644
--- a/arch/arm/mach-s3c64xx/s3c6410.c
+++ b/arch/arm/mach-s3c64xx/s3c6410.c
@@ -18,7 +18,7 @@
 #include <linux/init.h>
 #include <linux/clk.h>
 #include <linux/io.h>
-#include <linux/sysdev.h>
+#include <linux/device.h>
 #include <linux/serial_core.h>
 #include <linux/platform_device.h>
 
@@ -75,17 +75,18 @@
 	s3c64xx_init_irq(~0 & ~(1 << 7), ~0);
 }
 
-struct sysdev_class s3c6410_sysclass = {
-	.name	= "s3c6410-core",
+struct bus_type s3c6410_subsys = {
+	.name		= "s3c6410-core",
+	.dev_name	= "s3c6410-core",
 };
 
-static struct sys_device s3c6410_sysdev = {
-	.cls	= &s3c6410_sysclass,
+static struct device s3c6410_dev = {
+	.bus	= &s3c6410_subsys,
 };
 
 static int __init s3c6410_core_init(void)
 {
-	return sysdev_class_register(&s3c6410_sysclass);
+	return subsys_system_register(&s3c6410_subsys, NULL);
 }
 
 core_initcall(s3c6410_core_init);
@@ -94,5 +95,5 @@
 {
 	printk("S3C6410: Initialising architecture\n");
 
-	return sysdev_register(&s3c6410_sysdev);
+	return device_register(&s3c6410_dev);
 }
diff --git a/arch/arm/mach-s5p64x0/cpu.c b/arch/arm/mach-s5p64x0/cpu.c
index ecab40c..8b02990 100644
--- a/arch/arm/mach-s5p64x0/cpu.c
+++ b/arch/arm/mach-s5p64x0/cpu.c
@@ -16,7 +16,7 @@
 #include <linux/init.h>
 #include <linux/clk.h>
 #include <linux/io.h>
-#include <linux/sysdev.h>
+#include <linux/device.h>
 #include <linux/serial_core.h>
 #include <linux/platform_device.h>
 #include <linux/sched.h>
@@ -190,17 +190,18 @@
 	s5p_init_irq(vic, ARRAY_SIZE(vic));
 }
 
-struct sysdev_class s5p64x0_sysclass = {
-	.name	= "s5p64x0-core",
+struct bus_type s5p64x0_subsys = {
+	.name		= "s5p64x0-core",
+	.dev_name	= "s5p64x0-core",
 };
 
-static struct sys_device s5p64x0_sysdev = {
-	.cls	= &s5p64x0_sysclass,
+static struct device s5p64x0_subsys = {
+	.bus	= &s5p64x0_subsys,
 };
 
 static int __init s5p64x0_core_init(void)
 {
-	return sysdev_class_register(&s5p64x0_sysclass);
+	return subsys_system_register(&s5p64x0_subsys, NULL);
 }
 core_initcall(s5p64x0_core_init);
 
@@ -211,5 +212,5 @@
 	/* set idle function */
 	pm_idle = s5p64x0_idle;
 
-	return sysdev_register(&s5p64x0_sysdev);
+	return device_register(&s5p64x0_dev);
 }
diff --git a/arch/arm/mach-s5p64x0/pm.c b/arch/arm/mach-s5p64x0/pm.c
index 6992724..23f9b22 100644
--- a/arch/arm/mach-s5p64x0/pm.c
+++ b/arch/arm/mach-s5p64x0/pm.c
@@ -160,7 +160,7 @@
 
 }
 
-static int s5p64x0_pm_add(struct sys_device *sysdev)
+static int s5p64x0_pm_add(struct device *dev)
 {
 	pm_cpu_prep = s5p64x0_pm_prepare;
 	pm_cpu_sleep = s5p64x0_cpu_suspend;
@@ -169,15 +169,17 @@
 	return 0;
 }
 
-static struct sysdev_driver s5p64x0_pm_driver = {
-	.add		= s5p64x0_pm_add,
+static struct subsys_interface s5p64x0_pm_interface = {
+	.name		= "s5p64x0_pm",
+	.subsys		= &s5p64x0_subsys,
+	.add_dev	= s5p64x0_pm_add,
 };
 
 static __init int s5p64x0_pm_drvinit(void)
 {
 	s3c_pm_init();
 
-	return sysdev_driver_register(&s5p64x0_sysclass, &s5p64x0_pm_driver);
+	return subsys_interface_register(&s5p64x0_pm_interface);
 }
 arch_initcall(s5p64x0_pm_drvinit);
 
diff --git a/arch/arm/mach-s5pc100/cpu.c b/arch/arm/mach-s5pc100/cpu.c
index fd2708e..af52c09 100644
--- a/arch/arm/mach-s5pc100/cpu.c
+++ b/arch/arm/mach-s5pc100/cpu.c
@@ -21,7 +21,7 @@
 #include <linux/init.h>
 #include <linux/clk.h>
 #include <linux/io.h>
-#include <linux/sysdev.h>
+#include <linux/device.h>
 #include <linux/serial_core.h>
 #include <linux/platform_device.h>
 #include <linux/sched.h>
@@ -143,17 +143,18 @@
 	s5p_init_irq(vic, ARRAY_SIZE(vic));
 }
 
-static struct sysdev_class s5pc100_sysclass = {
-	.name	= "s5pc100-core",
+static struct bus_type s5pc100_subsys = {
+	.name		= "s5pc100-core",
+	.dev_name	= "s5pc100-core",
 };
 
-static struct sys_device s5pc100_sysdev = {
-	.cls	= &s5pc100_sysclass,
+static struct device s5pc100_dev = {
+	.bus	= &s5pc100_subsys,
 };
 
 static int __init s5pc100_core_init(void)
 {
-	return sysdev_class_register(&s5pc100_sysclass);
+	return subsys_system_register(&s5pc100_subsys, NULL);
 }
 
 core_initcall(s5pc100_core_init);
@@ -165,5 +166,5 @@
 	/* set idle function */
 	pm_idle = s5pc100_idle;
 
-	return sysdev_register(&s5pc100_sysdev);
+	return device_register(&s5pc100_sys);
 }
diff --git a/arch/arm/mach-s5pv210/cpu.c b/arch/arm/mach-s5pv210/cpu.c
index 84ec746..28e71ef 100644
--- a/arch/arm/mach-s5pv210/cpu.c
+++ b/arch/arm/mach-s5pv210/cpu.c
@@ -17,7 +17,7 @@
 #include <linux/module.h>
 #include <linux/clk.h>
 #include <linux/io.h>
-#include <linux/sysdev.h>
+#include <linux/device.h>
 #include <linux/platform_device.h>
 #include <linux/sched.h>
 #include <linux/dma-mapping.h>
@@ -174,17 +174,18 @@
 	s5p_init_irq(vic, ARRAY_SIZE(vic));
 }
 
-struct sysdev_class s5pv210_sysclass = {
-	.name	= "s5pv210-core",
+struct bus_type s5pv210_subsys = {
+	.name		= "s5pv210-core",
+	.dev_name	= "s5pv210-core",
 };
 
-static struct sys_device s5pv210_sysdev = {
-	.cls	= &s5pv210_sysclass,
+static struct device s5pv210_dev = {
+	.bus	= &s5pv210_subsys,
 };
 
 static int __init s5pv210_core_init(void)
 {
-	return sysdev_class_register(&s5pv210_sysclass);
+	return subsys_system_register(&s5pv210_subsys, NULL);
 }
 
 core_initcall(s5pv210_core_init);
@@ -199,5 +200,5 @@
 	/* set sw_reset function */
 	s5p_reset_hook = s5pv210_sw_reset;
 
-	return sysdev_register(&s5pv210_sysdev);
+	return device_register(&s5pv210_dev);
 }
diff --git a/arch/arm/mach-s5pv210/pm.c b/arch/arm/mach-s5pv210/pm.c
index f149d27..677c71c 100644
--- a/arch/arm/mach-s5pv210/pm.c
+++ b/arch/arm/mach-s5pv210/pm.c
@@ -133,7 +133,7 @@
 	s3c_pm_do_save(s5pv210_core_save, ARRAY_SIZE(s5pv210_core_save));
 }
 
-static int s5pv210_pm_add(struct sys_device *sysdev)
+static int s5pv210_pm_add(struct device *dev)
 {
 	pm_cpu_prep = s5pv210_pm_prepare;
 	pm_cpu_sleep = s5pv210_cpu_suspend;
@@ -141,13 +141,15 @@
 	return 0;
 }
 
-static struct sysdev_driver s5pv210_pm_driver = {
-	.add		= s5pv210_pm_add,
+static struct subsys_interface s5pv210_pm_interface = {
+	.name		= "s5pv210_pm",
+	.subsys		= &s5pv210_subsys,
+	.add_dev	= s5pv210_pm_add,
 };
 
 static __init int s5pv210_pm_drvinit(void)
 {
-	return sysdev_driver_register(&s5pv210_sysclass, &s5pv210_pm_driver);
+	return subsys_interface_register(&s5pv210_pm_interface);
 }
 arch_initcall(s5pv210_pm_drvinit);
 
diff --git a/arch/arm/plat-samsung/include/plat/cpu.h b/arch/arm/plat-samsung/include/plat/cpu.h
index 40fd7b6..0122a22 100644
--- a/arch/arm/plat-samsung/include/plat/cpu.h
+++ b/arch/arm/plat-samsung/include/plat/cpu.h
@@ -185,20 +185,20 @@
 extern struct syscore_ops s3c244x_pm_syscore_ops;
 extern struct syscore_ops s3c64xx_irq_syscore_ops;
 
-/* system device classes */
+/* system device subsystems */
 
-extern struct sysdev_class s3c2410_sysclass;
-extern struct sysdev_class s3c2410a_sysclass;
-extern struct sysdev_class s3c2412_sysclass;
-extern struct sysdev_class s3c2416_sysclass;
-extern struct sysdev_class s3c2440_sysclass;
-extern struct sysdev_class s3c2442_sysclass;
-extern struct sysdev_class s3c2443_sysclass;
-extern struct sysdev_class s3c6410_sysclass;
-extern struct sysdev_class s3c64xx_sysclass;
-extern struct sysdev_class s5p64x0_sysclass;
-extern struct sysdev_class s5pv210_sysclass;
-extern struct sysdev_class exynos4_sysclass;
+extern struct bus_type s3c2410_subsys;
+extern struct bus_type s3c2410a_subsys;
+extern struct bus_type s3c2412_subsys;
+extern struct bus_type s3c2416_subsys;
+extern struct bus_type s3c2440_subsys;
+extern struct bus_type s3c2442_subsys;
+extern struct bus_type s3c2443_subsys;
+extern struct bus_type s3c6410_subsys;
+extern struct bus_type s3c64xx_subsys;
+extern struct bus_type s5p64x0_subsys;
+extern struct bus_type s5pv210_subsys;
+extern struct bus_type exynos4_subsys;
 
 extern void (*s5pc1xx_idle)(void);
 
diff --git a/arch/arm/plat-samsung/include/plat/dma-s3c24xx.h b/arch/arm/plat-samsung/include/plat/dma-s3c24xx.h
index 1c1ed54..d015763 100644
--- a/arch/arm/plat-samsung/include/plat/dma-s3c24xx.h
+++ b/arch/arm/plat-samsung/include/plat/dma-s3c24xx.h
@@ -12,7 +12,7 @@
 
 #include <plat/dma-core.h>
 
-extern struct sysdev_class dma_sysclass;
+extern struct bus_type dma_subsys;
 extern struct s3c2410_dma_chan s3c2410_chans[S3C_DMA_CHANNELS];
 
 #define DMA_CH_VALID		(1<<31)
diff --git a/arch/arm/plat-samsung/include/plat/pm.h b/arch/arm/plat-samsung/include/plat/pm.h
index dcf6870..78014e5 100644
--- a/arch/arm/plat-samsung/include/plat/pm.h
+++ b/arch/arm/plat-samsung/include/plat/pm.h
@@ -17,7 +17,7 @@
 
 #include <linux/irq.h>
 
-struct sys_device;
+struct device;
 
 #ifdef CONFIG_PM