ARM: mach-shmobile: kzm9g: add PCF8757 gpio-key

This patch adds extra GPIO via PCF8757 chip,
and use it as gpio-key.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Tested-by: Simon Horman <horms@verge.net.au>
Acked-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

arch/arm/mach-shmobile/board-kzm9g.c

@@ -19,9 +19,12 @@
 
 #include <linux/delay.h>
 #include <linux/gpio.h>
+#include <linux/gpio_keys.h>
 #include <linux/io.h>
 #include <linux/irq.h>
 #include <linux/i2c.h>
+#include <linux/i2c/pcf857x.h>
+#include <linux/input.h>
 #include <linux/mmc/host.h>
 #include <linux/mmc/sh_mmcif.h>
 #include <linux/mmc/sh_mobile_sdhi.h>
@@ -39,6 +42,18 @@
 #include <asm/mach/arch.h>
 #include <video/sh_mobile_lcdc.h>
 
+/*
+ * external GPIO
+ */
+#define GPIO_PCF8575_BASE	(GPIO_NR)
+#define GPIO_PCF8575_PORT10	(GPIO_NR + 8)
+#define GPIO_PCF8575_PORT11	(GPIO_NR + 9)
+#define GPIO_PCF8575_PORT12	(GPIO_NR + 10)
+#define GPIO_PCF8575_PORT13	(GPIO_NR + 11)
+#define GPIO_PCF8575_PORT14	(GPIO_NR + 12)
+#define GPIO_PCF8575_PORT15	(GPIO_NR + 13)
+#define GPIO_PCF8575_PORT16	(GPIO_NR + 14)
+
 /* SMSC 9221 */
 static struct resource smsc9221_resources[] = {
 	[0] = {
@@ -225,20 +240,59 @@ static struct platform_device sdhi0_device = {
 	},
 };
 
+/* KEY */
+#define GPIO_KEY(c, g, d) { .code = c, .gpio = g, .desc = d, .active_low = 1 }
+
+static struct gpio_keys_button gpio_buttons[] = {
+	GPIO_KEY(KEY_BACK,	GPIO_PCF8575_PORT10,	"SW3"),
+	GPIO_KEY(KEY_RIGHT,	GPIO_PCF8575_PORT11,	"SW2-R"),
+	GPIO_KEY(KEY_LEFT,	GPIO_PCF8575_PORT12,	"SW2-L"),
+	GPIO_KEY(KEY_ENTER,	GPIO_PCF8575_PORT13,	"SW2-P"),
+	GPIO_KEY(KEY_UP,	GPIO_PCF8575_PORT14,	"SW2-U"),
+	GPIO_KEY(KEY_DOWN,	GPIO_PCF8575_PORT15,	"SW2-D"),
+	GPIO_KEY(KEY_HOME,	GPIO_PCF8575_PORT16,	"SW1"),
+};
+
+static struct gpio_keys_platform_data gpio_key_info = {
+	.buttons	= gpio_buttons,
+	.nbuttons	= ARRAY_SIZE(gpio_buttons),
+	.poll_interval	= 250, /* poling at this point */
+};
+
+static struct platform_device gpio_keys_device = {
+	/* gpio-pcf857x.c driver doesn't support gpio_to_irq() */
+	.name	= "gpio-keys-polled",
+	.dev	= {
+		.platform_data  = &gpio_key_info,
+	},
+};
+
 /* I2C */
+static struct pcf857x_platform_data pcf8575_pdata = {
+	.gpio_base	= GPIO_PCF8575_BASE,
+};
+
 static struct i2c_board_info i2c1_devices[] = {
 	{
 		I2C_BOARD_INFO("st1232-ts", 0x55),
 		.irq = intcs_evt2irq(0x300), /* IRQ8 */
 	},
 };
 
+static struct i2c_board_info i2c3_devices[] = {
+	{
+		I2C_BOARD_INFO("pcf8575", 0x20),
+		.platform_data = &pcf8575_pdata,
+	},
+};
+
 static struct platform_device *kzm_devices[] __initdata = {
 	&smsc_device,
 	&usb_host_device,
 	&lcdc_device,
 	&mmc_device,
 	&sdhi0_device,
+	&gpio_keys_device,
 };
 
 /*
@@ -373,12 +427,17 @@ static void __init kzm_init(void)
 	gpio_request(GPIO_PORT15, NULL);
 	gpio_direction_output(GPIO_PORT15, 1); /* power */
 
+	/* I2C 3 */
+	gpio_request(GPIO_FN_PORT27_I2C_SCL3, NULL);
+	gpio_request(GPIO_FN_PORT28_I2C_SDA3, NULL);
+
 #ifdef CONFIG_CACHE_L2X0
 	/* Early BRESP enable, Shared attribute override enable, 64K*8way */
 	l2x0_init(IOMEM(0xf0100000), 0x40460000, 0x82000fff);
 #endif
 
 	i2c_register_board_info(1, i2c1_devices, ARRAY_SIZE(i2c1_devices));
+	i2c_register_board_info(3, i2c3_devices, ARRAY_SIZE(i2c3_devices));
 
 	sh73a0_add_standard_devices();
 	platform_add_devices(kzm_devices, ARRAY_SIZE(kzm_devices));