ARM: mx5: Add gpio-keys to mx51 babbage board

Add functionality for the power button on MX51 Babbage board.
Signed-off-by: Dinh Nguyen <Dinh.Nguyen@freescale.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

arch/arm/configs/mx51_defconfig

@@ -82,6 +82,7 @@ CONFIG_FEC=y
 CONFIG_INPUT_FF_MEMLESS=m
 # CONFIG_INPUT_MOUSEDEV_PSAUX is not set
 CONFIG_INPUT_EVDEV=y
+CONFIG_KEYBOARD_GPIO=y
 CONFIG_INPUT_EVBUG=m
 CONFIG_MOUSE_PS2=m
 CONFIG_MOUSE_PS2_ELANTECH=y

arch/arm/mach-mx5/board-mx51_babbage.c

@@ -18,6 +18,8 @@
 #include <linux/io.h>
 #include <linux/fsl_devices.h>
 #include <linux/fec.h>
+#include <linux/gpio_keys.h>
+#include <linux/input.h>
 
 #include <mach/common.h>
 #include <mach/hardware.h>
@@ -38,6 +40,7 @@
 #define BABBAGE_USBH1_STP	(0*32 + 27)	/* GPIO_1_27 */
 #define BABBAGE_PHY_RESET	(1*32 + 5)	/* GPIO_2_5 */
 #define BABBAGE_FEC_PHY_RESET	(1*32 + 14)	/* GPIO_2_14 */
+#define BABBAGE_POWER_KEY	(1*32 + 21)	/* GPIO_2_21 */
 
 /* USB_CTRL_1 */
 #define MX51_USB_CTRL_1_OFFSET			0x10
@@ -47,6 +50,21 @@
 #define	MX51_USB_PLL_DIV_19_2_MHZ	0x01
 #define	MX51_USB_PLL_DIV_24_MHZ	0x02
 
+static struct gpio_keys_button babbage_buttons[] = {
+	{
+		.gpio		= BABBAGE_POWER_KEY,
+		.code		= BTN_0,
+		.desc		= "PWR",
+		.active_low	= 1,
+		.wakeup		= 1,
+	},
+};
+
+static const struct gpio_keys_platform_data imx_button_data __initconst = {
+	.buttons	= babbage_buttons,
+	.nbuttons	= ARRAY_SIZE(babbage_buttons),
+};
+
 static struct pad_desc mx51babbage_pads[] = {
 	/* UART1 */
 	MX51_PAD_UART1_RXD__UART1_RXD,
@@ -298,6 +316,7 @@ __setup("otg_mode=", babbage_otg_mode);
 static void __init mxc_board_init(void)
 {
 	struct pad_desc usbh1stp = MX51_PAD_USBH1_STP__USBH1_STP;
+	struct pad_desc power_key = MX51_PAD_EIM_A27__GPIO_2_21;
 
 #if defined(CONFIG_CPU_FREQ_IMX)
 	get_cpu_op = mx51_get_cpu_op;
@@ -308,6 +327,11 @@ static void __init mxc_board_init(void)
 	babbage_fec_reset();
 	imx51_add_fec(NULL);
 
+	/* Set the PAD settings for the pwr key. */
+	power_key.pad_ctrl = MX51_GPIO_PAD_CTRL_2;
+	mxc_iomux_v3_setup_pad(&power_key);
+	imx51_add_gpio_keys(&imx_button_data);
+
 	imx51_add_imx_i2c(0, &babbage_i2c_data);
 	imx51_add_imx_i2c(1, &babbage_i2c_data);
 	mxc_register_device(&mxc_hsi2c_device, &babbage_hsi2c_data);

arch/arm/mach-mx5/devices-imx51.h

@@ -13,6 +13,8 @@ extern const struct imx_fec_data imx51_fec_data __initconst;
 #define imx51_add_fec(pdata)	\
 	imx_add_fec(&imx51_fec_data, pdata)
 
+#define imx51_add_gpio_keys(pdata) imx_add_gpio_keys(pdata)
+
 extern const struct imx_imx_i2c_data imx51_imx_i2c_data[] __initconst;
 #define imx51_add_imx_i2c(id, pdata)	\
 	imx_add_imx_i2c(&imx51_imx_i2c_data[id], pdata)