The board had 4 buttons connected to GPIOs, add a corresponding
gpio-keys device.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
                regulator-boot-on;
        };
 
+       gpio-keys {
+               compatible = "gpio-keys";
+
+               power-key {
+                       gpios = <&pfc 99 GPIO_ACTIVE_LOW>;
+                       linux,code = <116>;
+                       label = "SW3";
+                       gpio-key,wakeup;
+               };
+
+               back-key {
+                       gpios = <&pfc 100 GPIO_ACTIVE_LOW>;
+                       linux,code = <158>;
+                       label = "SW4";
+               };
+
+               menu-key {
+                       gpios = <&pfc 97 GPIO_ACTIVE_LOW>;
+                       linux,code = <139>;
+                       label = "SW5";
+               };
+
+               home-key {
+                       gpios = <&pfc 98 GPIO_ACTIVE_LOW>;
+                       linux,code = <102>;
+                       label = "SW6";
+               };
+       };
+
        leds {
                compatible = "gpio-leds";
                led1 {