platform: Remove most references to platform_bus device

A number of board files in arch/arm and arch/unicore32
explicitly reference platform_bus device as a parent
for new platform devices.

This is unnecessary, as platform device API guarantees
that devices with NULL parent are going to by adopted
by the mentioned "root" device.

This patch removes or replaces with NULL such references.

Signed-off-by: Pawel Moll <pawel.moll@arm.com>
Acked-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/arch/arm/mach-shmobile/setup-r8a7778.c b/arch/arm/mach-shmobile/setup-r8a7778.c
index d311ef9..5de7b33 100644
--- a/arch/arm/mach-shmobile/setup-r8a7778.c
+++ b/arch/arm/mach-shmobile/setup-r8a7778.c
@@ -64,7 +64,7 @@
 R8A7778_SCIF(5, 0xffe45000, gic_iid(0x6b));
 
 #define r8a7778_register_scif(index)					       \
-	platform_device_register_resndata(&platform_bus, "sh-sci", index,      \
+	platform_device_register_resndata(NULL, "sh-sci", index,	       \
 					  scif##index##_resources,	       \
 					  ARRAY_SIZE(scif##index##_resources), \
 					  &scif##index##_platform_data,	       \
@@ -84,7 +84,7 @@
 
 #define r8a7778_register_tmu(idx)			\
 	platform_device_register_resndata(		\
-		&platform_bus, "sh-tmu", idx,		\
+		NULL, "sh-tmu", idx,			\
 		sh_tmu##idx##_resources,		\
 		ARRAY_SIZE(sh_tmu##idx##_resources),	\
 		&sh_tmu##idx##_platform_data,		\
@@ -173,7 +173,6 @@
 
 #define USB_PLATFORM_INFO(hci)					\
 static struct platform_device_info hci##_info __initdata = {	\
-	.parent		= &platform_bus,			\
 	.name		= #hci "-platform",			\
 	.id		= -1,					\
 	.res		= hci##_resources,			\
@@ -212,7 +211,7 @@
 
 #define r8a7778_register_gpio(idx)				\
 	platform_device_register_resndata(			\
-		&platform_bus, "gpio_rcar", idx,		\
+		NULL, "gpio_rcar", idx,				\
 		r8a7778_gpio##idx##_resources,			\
 		ARRAY_SIZE(r8a7778_gpio##idx##_resources),	\
 		&r8a7778_gpio##idx##_platform_data,		\
@@ -496,8 +495,8 @@
 
 static void __init r8a7778_register_hpb_dmae(void)
 {
-	platform_device_register_resndata(&platform_bus, "hpb-dma-engine", -1,
-					  hpb_dmae_resources,
+	platform_device_register_resndata(NULL, "hpb-dma-engine",
+					  -1, hpb_dmae_resources,
 					  ARRAY_SIZE(hpb_dmae_resources),
 					  &dma_platform_data,
 					  sizeof(dma_platform_data));
@@ -565,7 +564,7 @@
 	r8a7778_init_irq_extpin_dt(irlm);
 	if (irlm)
 		platform_device_register_resndata(
-			&platform_bus, "renesas_intc_irqpin", -1,
+			NULL, "renesas_intc_irqpin", -1,
 			irqpin_resources, ARRAY_SIZE(irqpin_resources),
 			&irqpin_platform_data, sizeof(irqpin_platform_data));
 }