arm/mx2: define seperate imx_nand devices for imx21 and imx27

As the NFC controller has different addresses on imx21 and imx27 there
are two different devices needed if not relying on the overloaded cpp
macro NFC_BASE_ADDR.  So some cpp magic is added to minimize code
duplication.

As obviously these two defines need different names, the name of the old
device is #defined to the new one when building for only one of imx21 or
imx27.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

arch/arm/mach-mx2/devices.c

@@ -144,24 +144,33 @@ struct platform_device mxc_w1_master_device = {
 	.resource = mxc_w1_master_resources,
 };
 
-static struct resource mxc_nand_resources[] = {
-	{
-		.start = NFC_BASE_ADDR,
-		.end = NFC_BASE_ADDR + SZ_4K - 1,
-		.flags = IORESOURCE_MEM,
-	}, {
-		.start = MX2x_INT_NANDFC,
-		.end = MX2x_INT_NANDFC,
-		.flags = IORESOURCE_IRQ,
-	},
-};
+#define DEFINE_MXC_NAND_DEVICE(pfx, baseaddr, irq)			\
+	static struct resource pfx ## _nand_resources[] = {		\
+		{							\
+			.start = baseaddr,				\
+			.end = baseaddr + SZ_4K - 1,			\
+			.flags = IORESOURCE_MEM,			\
+		}, {							\
+			.start = irq,					\
+			.end = irq,					\
+			.flags = IORESOURCE_IRQ,			\
+		},							\
+	};								\
+									\
+	struct platform_device pfx ## _nand_device = {			\
+		.name = "mxc_nand",					\
+		.id = 0,						\
+		.num_resources = ARRAY_SIZE(pfx ## _nand_resources),	\
+		.resource = pfx ## _nand_resources,			\
+	}
 
-struct platform_device mxc_nand_device = {
-	.name = "mxc_nand",
-	.id = 0,
-	.num_resources = ARRAY_SIZE(mxc_nand_resources),
-	.resource = mxc_nand_resources,
-};
+#ifdef CONFIG_MACH_MX21
+DEFINE_MXC_NAND_DEVICE(imx21, MX21_NFC_BASE_ADDR, MX21_INT_NANDFC);
+#endif
+
+#ifdef CONFIG_MACH_MX27
+DEFINE_MXC_NAND_DEVICE(imx27, MX27_NFC_BASE_ADDR, MX27_INT_NANDFC);
+#endif
 
 /*
  * lcdc:

arch/arm/mach-mx2/devices.h

@@ -13,7 +13,16 @@ extern struct platform_device mxc_uart_device3;
 extern struct platform_device mxc_uart_device4;
 extern struct platform_device mxc_uart_device5;
 extern struct platform_device mxc_w1_master_device;
-extern struct platform_device mxc_nand_device;
+#ifdef CONFIG_MACH_MX21
+extern struct platform_device imx21_nand_device;
+#define mxc_nand_device imx21_nand_device
+#endif
+#ifdef CONFIG_MACH_MX27
+extern struct platform_device imx27_nand_device;
+#ifndef CONFIG_MACH_MX21
+#define mxc_nand_device imx27_nand_device
+#endif
+#endif
 extern struct platform_device mxc_fb_device;
 extern struct platform_device mxc_fec_device;
 extern struct platform_device mxc_pwm_device;