ARM: plat-iop: instantiate GPIO from platform device
This converts the IOP32x and IOP33x platforms to pass their
base address offset by a resource attached to a platform device
instead of using static offset macros implicitly passed
through <linux/gpio.h> including <mach/gpio.h>. Delete the
local <mach/gpio.h> and <asm/hardware/iop3xx-gpio.h> headers
and remove the selection of NEED_MACH_GPIO_H.
Pass the virtual address as a resource in the platform device
at this point for bisectability, next patch will pass the
physical address as is custom.
Cc: Lennert Buytenhek <kernel@wantstofly.org>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Mikael Pettersson <mikpe@it.uu.se>
Tested-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/gpio/gpio-iop.c b/drivers/gpio/gpio-iop.c
index 17cc701..24a86b0 100644
--- a/drivers/gpio/gpio-iop.c
+++ b/drivers/gpio/gpio-iop.c
@@ -16,9 +16,23 @@
#include <linux/errno.h>
#include <linux/gpio.h>
#include <linux/export.h>
+#include <linux/platform_device.h>
#define IOP3XX_N_GPIOS 8
+#define GPIO_IN 0
+#define GPIO_OUT 1
+#define GPIO_LOW 0
+#define GPIO_HIGH 1
+
+/* Memory base offset */
+static void __iomem *base;
+
+#define IOP3XX_GPIO_REG(reg) (base + (reg))
+#define IOP3XX_GPOE (volatile u32 *)IOP3XX_GPIO_REG(0x0000)
+#define IOP3XX_GPID (volatile u32 *)IOP3XX_GPIO_REG(0x0004)
+#define IOP3XX_GPOD (volatile u32 *)IOP3XX_GPIO_REG(0x0008)
+
static void gpio_line_config(int line, int direction)
{
unsigned long flags;
@@ -83,8 +97,26 @@
.ngpio = IOP3XX_N_GPIOS,
};
-static int __init iop3xx_gpio_setup(void)
+static int iop3xx_gpio_probe(struct platform_device *pdev)
{
+ struct resource *res;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ base = (void *) res->start;
+
return gpiochip_add(&iop3xx_chip);
}
-arch_initcall(iop3xx_gpio_setup);
+
+static struct platform_driver iop3xx_gpio_driver = {
+ .driver = {
+ .name = "gpio-iop",
+ .owner = THIS_MODULE,
+ },
+ .probe = iop3xx_gpio_probe,
+};
+
+static int __init iop3xx_gpio_init(void)
+{
+ return platform_driver_register(&iop3xx_gpio_driver);
+}
+arch_initcall(iop3xx_gpio_init);