From: Magnus Damm <damm+rene...@opensource.se>

Extend the Silk board support to include SW3, SW4, SW6 and SW12. They
are all connected via GPIO lines and handled by the gpio-keys driver.

Signed-off-by: Magnus Damm <damm+rene...@opensource.se>
---

 arch/arm/boot/dts/r8a7794-silk.dts |   55 ++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)

--- 0002/arch/arm/boot/dts/r8a7794-silk.dts
+++ work/arch/arm/boot/dts/r8a7794-silk.dts     2018-02-19 20:24:48.960607110 
+0900
@@ -24,6 +24,7 @@
 /dts-v1/;
 #include "r8a7794.dtsi"
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
 
 / {
        model = "SILK";
@@ -45,6 +46,60 @@
                reg = <0 0x40000000 0 0x40000000>;
        };
 
+       gpio-keys {
+               compatible = "gpio-keys";
+
+               key-3 {
+                       gpios = <&gpio5 10 GPIO_ACTIVE_LOW>;
+                       linux,code = <KEY_3>;
+                       label = "SW3";
+                       wakeup-source;
+                       debounce-interval = <20>;
+               };
+               key-4 {
+                       gpios = <&gpio5 11 GPIO_ACTIVE_LOW>;
+                       linux,code = <KEY_4>;
+                       label = "SW4";
+                       wakeup-source;
+                       debounce-interval = <20>;
+               };
+               key-6 {
+                       gpios = <&gpio5 12 GPIO_ACTIVE_LOW>;
+                       linux,code = <KEY_6>;
+                       label = "SW6";
+                       wakeup-source;
+                       debounce-interval = <20>;
+               };
+               key-a {
+                       gpios = <&gpio3 9 GPIO_ACTIVE_LOW>;
+                       linux,code = <KEY_A>;
+                       label = "SW12-1";
+                       wakeup-source;
+                       debounce-interval = <20>;
+               };
+               key-b {
+                       gpios = <&gpio3 10 GPIO_ACTIVE_LOW>;
+                       linux,code = <KEY_B>;
+                       label = "SW12-2";
+                       wakeup-source;
+                       debounce-interval = <20>;
+               };
+               key-c {
+                       gpios = <&gpio3 11 GPIO_ACTIVE_LOW>;
+                       linux,code = <KEY_C>;
+                       label = "SW12-3";
+                       wakeup-source;
+                       debounce-interval = <20>;
+               };
+               key-d {
+                       gpios = <&gpio3 12 GPIO_ACTIVE_LOW>;
+                       linux,code = <KEY_D>;
+                       label = "SW12-4";
+                       wakeup-source;
+                       debounce-interval = <20>;
+               };
+       };
+
        d3_3v: regulator-d3-3v {
                compatible = "regulator-fixed";
                regulator-name = "D3.3V";

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