[PATCH] ARM: dts: add support for gpio buttons for exynos5422-odroidxu3

[Anand Moon <linux.amoon@gmail.com>]

Add support for gpio-based button on Odroid-XU3 boards
for reboot/poweroff feature.

Signed-off-by: Anand Moon <linux.amoon@gmail.com>
---
changes rebase based on linux next-20160222.

Tested on Odroid-XU4

dmesg output.
[    3.286068] of_get_named_gpiod_flags: parsed 'gpios' property of node '/gpio_keys/power_key[0]' - status (0)
[    3.286206] gpio-11 (power key): gpiod_set_debounce: missing set() or set_debounce() operations
[    3.286600] input: gpio_keys as /devices/platform/gpio_keys/input/input0
---
 arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi b/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
index 1bd507b..db9770b 100644
--- a/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
+++ b/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
@@ -11,6 +11,7 @@
 */
 
 #include <dt-bindings/clock/samsung,s2mps11.h>
+#include <dt-bindings/input/input.h>
 #include <dt-bindings/interrupt-controller/irq.h>
 #include <dt-bindings/gpio/gpio.h>
 #include <dt-bindings/sound/samsung-i2s.h>
@@ -54,6 +55,22 @@
 		#cooling-cells = <2>;
 		cooling-levels = <0 130 170 230>;
 	};
+
+	gpio_keys {
+		compatible = "gpio-keys";
+		pinctrl-names = "default";
+		pinctrl-0 = <&gpio_power_key>;
+
+		power_key {
+			interrupt-parent = <&gpx0>;
+			interrupts = <3 IRQ_TYPE_NONE>;
+			gpios = <&gpx0 3 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_POWER>;
+			label = "power key";
+			debounce-interval = <10>;
+			wakeup-source;
+		};
+	};
 };
 
 &clock_audss {
@@ -362,6 +379,11 @@
 };
 
 &pinctrl_0 {
+	gpio_power_key: power_key {
+		samsung,pins = "gpx0-3";
+		samsung,pin-pud = <0>;
+	};
+
 	hdmi_hpd_irq: hdmi-hpd-irq {
 		samsung,pins = "gpx3-7";
 		samsung,pin-function = <0>;
-- 
2.1.4