mx51: add imx_keypad device definition for mx51 platforms

add imx_keypad platform device definition and clocks for mx51
platforms.

Signed-off-by: Jason Wang <jason77.wang@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
diff --git a/arch/arm/mach-mx5/devices.c b/arch/arm/mach-mx5/devices.c
index fa11864..aafa61c 100644
--- a/arch/arm/mach-mx5/devices.c
+++ b/arch/arm/mach-mx5/devices.c
@@ -226,6 +226,25 @@
 	.resource = mxc_wdt_resources,
 };
 
+static struct resource mxc_kpp_resources[] = {
+	{
+		.start = MX51_MXC_INT_KPP,
+		.end = MX51_MXC_INT_KPP,
+		.flags = IORESOURCE_IRQ,
+	} , {
+		.start = MX51_KPP_BASE_ADDR,
+		.end = MX51_KPP_BASE_ADDR + 0x8 - 1,
+		.flags = IORESOURCE_MEM,
+	},
+};
+
+struct platform_device mxc_keypad_device = {
+	.name = "imx-keypad",
+	.id = 0,
+	.num_resources = ARRAY_SIZE(mxc_kpp_resources),
+	.resource = mxc_kpp_resources,
+};
+
 static struct mxc_gpio_port mxc_gpio_ports[] = {
 	{
 		.chip.label = "gpio-0",