[ARM PATCH] 2358/1: Add IXP46x I2C platform device

Patch from Deepak Saxena

The IXP46x chips from Intel include the same I2C controller as found
on the IOP3xx.  This patch adds a hook to the platform-level init code
to add that device to the device tree if running on a 46x CPU. A
separate patch has been sent upstream via Greg KH for the changes to the
I2C driver to support both IOP and IXP systems.

While at it, we fix a minor issue with the code where we were sending 
the wrong ptr to platform_add_devices(). I am not sure how it ever 
worked...

Signed-off-by: Deepak Saxena
Signed-off-by: Russell King

arch/arm/mach-ixp4xx/common.c

@@ -279,3 +279,40 @@ struct sys_timer ixp4xx_timer = {
 	.init		= ixp4xx_timer_init,
 	.offset		= ixp4xx_gettimeoffset,
 };
+
+static struct resource ixp46x_i2c_resources[] = {
+	[0] = {
+		.start 	= 0xc8011000,
+		.end	= 0xc801101c,
+		.flags	= IORESOURCE_MEM,
+	},
+	[1] = {
+		.start 	= IRQ_IXP4XX_I2C,
+		.end	= IRQ_IXP4XX_I2C,
+		.flags	= IORESOURCE_IRQ
+	}
+};
+
+/*
+ * I2C controller. The IXP46x uses the same block as the IOP3xx, so
+ * we just use the same device name.
+ */
+static struct platform_device ixp46x_i2c_controller = {
+	.name		= "IOP3xx-I2C",
+	.id		= 0,
+	.num_resources	= 2,
+	.resource	= &ixp46x_i2c_resources
+};
+
+static struct platform_device *ixp46x_devices[] __initdata = {
+	&ixp46x_i2c_controller
+};
+
+void __init ixp4xx_sys_init(void)
+{
+	if (cpu_is_ixp46x()) {
+		platform_add_devices(ixp46x_devices,
+				ARRAY_SIZE(ixp46x_devices));
+	}
+}
+

arch/arm/mach-ixp4xx/coyote-setup.c

@@ -89,7 +89,8 @@ static void __init coyote_init(void)
 	*IXP4XX_EXP_CS0 |= IXP4XX_FLASH_WRITABLE;
 	*IXP4XX_EXP_CS1 = *IXP4XX_EXP_CS0;
 
-	platform_add_devices(&coyote_devices, ARRAY_SIZE(coyote_devices));
+	ixp4xx_sys_init();
+	platform_add_devices(coyote_devices, ARRAY_SIZE(coyote_devices));
 }
 
 #ifdef CONFIG_ARCH_ADI_COYOTE

arch/arm/mach-ixp4xx/ixdp425-setup.c

@@ -108,6 +108,8 @@ static struct platform_device *ixdp425_devices[] __initdata = {
 
 static void __init ixdp425_init(void)
 {
+	ixp4xx_sys_init();
+
 	/*
 	 * IXP465 has 32MB window
 	 */
@@ -115,7 +117,7 @@ static void __init ixdp425_init(void)
 		ixdp425_flash_resource.end += IXDP425_FLASH_SIZE;
 	}
 
-	platform_add_devices(&ixdp425_devices, ARRAY_SIZE(ixdp425_devices));
+	platform_add_devices(ixdp425_devices, ARRAY_SIZE(ixdp425_devices));
 }
 
 MACHINE_START(IXDP425, "Intel IXDP425 Development Platform")

arch/arm/mach-ixp4xx/prpmc1100-setup.c

@@ -79,7 +79,9 @@ static struct platform_device *prpmc1100_devices[] __initdata = {
 
 static void __init prpmc1100_init(void)
 {
-	platform_add_devices(&prpmc1100_devices, ARRAY_SIZE(prpmc1100_devices));
+	ixp4xx_sys_init();
+
+	platform_add_devices(prpmc1100_devices, ARRAY_SIZE(prpmc1100_devices));
 }
 
 MACHINE_START(PRPMC1100, "Motorola PrPMC1100")

include/asm-arm/arch-ixp4xx/irqs.h

@@ -48,14 +48,6 @@
 #define IRQ_IXP4XX_GPIO12	29
 #define IRQ_IXP4XX_SW_INT1	30
 #define IRQ_IXP4XX_SW_INT2	31
-
-#ifndef	CONFIG_CPU_IXP46X
-#define NR_IRQS			32
-#else
-
-/*
- * IXP465 adds new sources
- */
 #define IRQ_IXP4XX_USB_HOST	32
 #define IRQ_IXP4XX_I2C		33
 #define IRQ_IXP4XX_SSP		34
@@ -67,6 +59,12 @@
 #define IRQ_IXP4XX_MCU_ECC	61
 #define IRQ_IXP4XX_EXP_PE	62
 
+/*
+ * Only first 32 sources are valid if running on IXP42x systems
+ */
+#ifndef	CONFIG_CPU_IXP46X
+#define NR_IRQS			32
+#else
 #define NR_IRQS			64
 #endif
 

include/asm-arm/arch-ixp4xx/platform.h

@@ -60,6 +60,7 @@ struct sys_timer;
  */
 extern void ixp4xx_map_io(void);
 extern void ixp4xx_init_irq(void);
+extern void ixp4xx_sys_init(void);
 extern struct sys_timer ixp4xx_timer;
 extern void ixp4xx_pci_preinit(void);
 struct pci_sys_data;