[PATCH 13/14] ARM: s3c: crag6410: use software nodes/properties to set up GPIO keys

[Dmitry Torokhov <dmitry.torokhov@gmail.com>]

Switch the gpio-keys device to use software inodes/properties to
describe the buttons and switches. This will allow dropping support
for platform data from the gpio-keys driver in the future.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---
 arch/arm/mach-s3c/gpio-samsung-s3c64xx.h |  5 ++
 arch/arm/mach-s3c/gpio-samsung.c         | 35 +++++++++++
 arch/arm/mach-s3c/mach-crag6410.c        | 80 +++++++++++++++++-------
 3 files changed, 99 insertions(+), 21 deletions(-)

diff --git a/arch/arm/mach-s3c/gpio-samsung-s3c64xx.h b/arch/arm/mach-s3c/gpio-samsung-s3c64xx.h
index 8ed144a0d474..7cf16cc085ea 100644
--- a/arch/arm/mach-s3c/gpio-samsung-s3c64xx.h
+++ b/arch/arm/mach-s3c/gpio-samsung-s3c64xx.h
@@ -13,6 +13,8 @@
 
 #ifdef CONFIG_GPIO_SAMSUNG
 
+#include <linux/property.h>
+
 /* GPIO bank sizes */
 #define S3C64XX_GPIO_A_NR	(8)
 #define S3C64XX_GPIO_B_NR	(7)
@@ -89,6 +91,9 @@ enum s3c_gpio_number {
 /* define the number of gpios we need to the one after the GPQ() range */
 #define GPIO_BOARD_START (S3C64XX_GPQ(S3C64XX_GPIO_Q_NR) + 1)
 
+extern const struct software_node samsung_gpiochip_nodes[];
+#define SAMSUNG_GPIO_NODE(node)	&samsung_gpiochip_nodes[(node) - 'A']
+
 #endif /* GPIO_SAMSUNG */
 #endif /* GPIO_SAMSUNG_S3C64XX_H */
 
diff --git a/arch/arm/mach-s3c/gpio-samsung.c b/arch/arm/mach-s3c/gpio-samsung.c
index 87daaa09e2c3..82f325112d30 100644
--- a/arch/arm/mach-s3c/gpio-samsung.c
+++ b/arch/arm/mach-s3c/gpio-samsung.c
@@ -21,6 +21,7 @@
 #include <linux/device.h>
 #include <linux/ioport.h>
 #include <linux/of.h>
+#include <linux/property.h>
 #include <linux/slab.h>
 #include <linux/of_address.h>
 
@@ -788,6 +789,38 @@ static struct samsung_gpio_chip s3c64xx_gpios_2bit[] = {
 	},
 };
 
+const struct software_node samsung_gpiochip_nodes[] = {
+	SOFTWARE_NODE("GPA", NULL, NULL),
+	SOFTWARE_NODE("GPB", NULL, NULL),
+	SOFTWARE_NODE("GPC", NULL, NULL),
+	SOFTWARE_NODE("GPD", NULL, NULL),
+	SOFTWARE_NODE("GPE", NULL, NULL),
+	SOFTWARE_NODE("GPF", NULL, NULL),
+	SOFTWARE_NODE("GPG", NULL, NULL),
+	SOFTWARE_NODE("GPH", NULL, NULL),
+	SOFTWARE_NODE("GPI", NULL, NULL),
+	SOFTWARE_NODE("GPJ", NULL, NULL),
+	SOFTWARE_NODE("GPK", NULL, NULL),
+	SOFTWARE_NODE("GPL", NULL, NULL),
+	SOFTWARE_NODE("GPM", NULL, NULL),
+	SOFTWARE_NODE("GPN", NULL, NULL),
+	SOFTWARE_NODE("GPO", NULL, NULL),
+	SOFTWARE_NODE("GPP", NULL, NULL),
+	SOFTWARE_NODE("GPQ", NULL, NULL),
+};
+#define NUM_SAMSUNG_GPIOCHIPS ARRAY_SIZE(samsung_gpiochip_nodes)
+
+static void __init samsung_setup_gpiochip_nodes(void)
+{
+	const struct software_node *group[NUM_SAMSUNG_GPIOCHIPS + 1] = { 0 };
+	int i;
+
+	for (i = 0; i < NUM_SAMSUNG_GPIOCHIPS; i++)
+		group[i] = &samsung_gpiochip_nodes[i];
+
+	software_node_register_node_group(group);
+}
+
 /* TODO: cleanup soc_is_* */
 static __init int samsung_gpiolib_init(void)
 {
@@ -811,6 +844,8 @@ static __init int samsung_gpiolib_init(void)
 				S3C64XX_VA_GPIO);
 		samsung_gpiolib_add_4bit2_chips(s3c64xx_gpios_4bit2,
 				ARRAY_SIZE(s3c64xx_gpios_4bit2));
+
+		samsung_setup_gpiochip_nodes();
 	}
 
 	return 0;
diff --git a/arch/arm/mach-s3c/mach-crag6410.c b/arch/arm/mach-s3c/mach-crag6410.c
index 16b6ef312aaf..6aa74db08af9 100644
--- a/arch/arm/mach-s3c/mach-crag6410.c
+++ b/arch/arm/mach-s3c/mach-crag6410.c
@@ -18,11 +18,13 @@
 #include <linux/input/matrix_keypad.h>
 #include <linux/gpio.h>
 #include <linux/gpio/machine.h>
+#include <linux/gpio/property.h>
 #include <linux/leds.h>
 #include <linux/delay.h>
 #include <linux/mmc/host.h>
 #include <linux/regulator/machine.h>
 #include <linux/regulator/fixed.h>
+#include <linux/property.h>
 #include <linux/pwm.h>
 #include <linux/pwm_backlight.h>
 #include <linux/dm9000.h>
@@ -227,32 +229,68 @@ static void __init crag6410_setup_keypad(void)
 		pr_err("failed to instantiate keypad device");
 }
 
-static struct gpio_keys_button crag6410_gpio_keys[] = {
-	[0] = {
-		.code	= KEY_SUSPEND,
-		.gpio	= S3C64XX_GPL(10),	/* EINT 18 */
-		.type	= EV_KEY,
-		.wakeup	= 1,
-		.active_low = 1,
-	},
-	[1] = {
-		.code	= SW_FRONT_PROXIMITY,
-		.gpio	= S3C64XX_GPN(11),	/* EINT 11 */
-		.type	= EV_SW,
-	},
+static const struct software_node crag6410_gpio_keys_node = {
+	.name = "crag6410-gpio-keys",
 };
 
-static struct gpio_keys_platform_data crag6410_gpio_keydata = {
-	.buttons	= crag6410_gpio_keys,
-	.nbuttons	= ARRAY_SIZE(crag6410_gpio_keys),
+static const struct property_entry crag6410_suspend_key_props[] = {
+	PROPERTY_ENTRY_U32("linux,code", KEY_SUSPEND),
+	PROPERTY_ENTRY_GPIO("gpios",
+			    SAMSUNG_GPIO_NODE('L'), 10,	/* EINT 18 */
+			    GPIO_ACTIVE_LOW),
+	PROPERTY_ENTRY_BOOL("wakeup-source"),
+	{ }
 };
 
-static struct platform_device crag6410_gpio_keydev = {
-	.name		= "gpio-keys",
-	.id		= 0,
-	.dev.platform_data = &crag6410_gpio_keydata,
+static const struct software_node crag6410_suspend_key_node = {
+	.parent = &crag6410_gpio_keys_node,
+	.properties = crag6410_suspend_key_props,
+};
+
+static const struct property_entry crag6410_prox_sw_props[] = {
+	PROPERTY_ENTRY_U32("linux,type", EV_SW),
+	PROPERTY_ENTRY_U32("linux,code", SW_FRONT_PROXIMITY),
+	PROPERTY_ENTRY_GPIO("gpios",
+			    SAMSUNG_GPIO_NODE('N'), 11,	/* EINT 11 */
+			    GPIO_ACTIVE_HIGH),
+	{ }
+};
+
+static const struct software_node crag6410_prox_sw_node = {
+	.parent = &crag6410_gpio_keys_node,
+	.properties = crag6410_prox_sw_props,
 };
 
+static const struct software_node *crag6410_gpio_keys_swnodes[] = {
+	&crag6410_gpio_keys_node,
+	&crag6410_suspend_key_node,
+	&crag6410_prox_sw_node,
+	NULL
+};
+
+static void __init crag6410_setup_gpio_keys(void)
+{
+	struct platform_device_info keys_info = {
+		.name	= "gpio-keys",
+		.id	= 0,
+	};
+	struct platform_device *pd;
+	int err;
+
+	err = software_node_register_node_group(crag6410_gpio_keys_swnodes);
+	if (err) {
+		pr_err("failed to register gpio-keys software nodes: %d\n", err);
+		return;
+	}
+
+	keys_info.fwnode = software_node_fwnode(&crag6410_gpio_keys_node);
+
+	pd = platform_device_register_full(&keys_info);
+	err = PTR_ERR_OR_ZERO(pd);
+	if (err)
+		pr_err("failed to create gpio-keys device: %d\n", err);
+}
+
 static struct resource crag6410_dm9k_resource[] = {
 	[0] = DEFINE_RES_MEM(S3C64XX_PA_XM0CSN5, 2),
 	[1] = DEFINE_RES_MEM(S3C64XX_PA_XM0CSN5 + (1 << 8), 2),
@@ -393,7 +431,6 @@ static struct platform_device *crag6410_devs0[] __initdata = {
 	&samsung_device_pwm,
 	&s3c64xx_device_iis0,
 	&s3c64xx_device_iis1,
-	&crag6410_gpio_keydev,
 };
 
 static struct platform_device *crag6410_devs1[] __initdata = {
@@ -897,6 +934,7 @@ static void __init crag6410_machine_init(void)
 	platform_add_devices(crag6410_devs0, ARRAY_SIZE(crag6410_devs0));
 
 	crag6410_setup_keypad();
+	crag6410_setup_gpio_keys();
 
 	platform_add_devices(crag6410_devs1, ARRAY_SIZE(crag6410_devs1));
 
-- 
2.46.0.184.g6999bdac58-goog