arm: mvebu: add button for OpenBlocks AX3-4

The OpenBlocks AX3-4 board has one software-controlled button on the
front side, labeled "INIT", so we add minimal support for this button
in the kernel.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

1 files changed, 12 insertions, 0 deletions

diff --git a/arch/arm/boot/dts/armada-xp-openblocks-ax3-4.dts b/arch/arm/boot/dts/armada-xp-openblocks-ax3-4.dts
index b42652fd3d8c..ec368643e478 100644
--- a/arch/arm/boot/dts/armada-xp-openblocks-ax3-4.dts
+++ b/arch/arm/boot/dts/armada-xp-openblocks-ax3-4.dts
@@ -66,6 +66,18 @@
                         };
                 };
 
+                gpio_keys {
+                        compatible = "gpio-keys";
+                        #address-cells = <1>;
+                        #size-cells = <0>;
+
+                        button@1 {
+                                label = "Init Button";
+                                linux,code = <116>;
+                                gpios = <&gpio1 28 0>;
+                        };
+                };
+
                 mdio {
                         phy0: ethernet-phy@0 {
                                 reg = <0>;