[PATCH 1/1] riscv: add DT binding for BOOT button on Maix board

[Heinrich Schuchardt]

Add a device tree binding for the BOOT button on the Maix board.

Signed-off-by: Heinrich Schuchardt <xypron.g...@gmx.de>
---
Together with
[PATCH 1/1] cmd/button: return button status
https://lists.denx.de/pipermail/u-boot/2020-September/425221.html
we can use the button status to decide which program to boot.
---
 arch/riscv/dts/k210-maix-bit.dts | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/riscv/dts/k210-maix-bit.dts b/arch/riscv/dts/k210-maix-bit.dts
index e840e04ada..c2beec602c 100644
--- a/arch/riscv/dts/k210-maix-bit.dts
+++ b/arch/riscv/dts/k210-maix-bit.dts
@@ -8,6 +8,7 @@
 #include "k210.dtsi"

 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>

 / {
        model = "Sipeed Maix Bit 2.0";
@@ -33,6 +34,16 @@
                };
        };

+       gpio-keys {
+               compatible = "gpio-keys";
+
+               boot {
+                       label = "BOOT";
+                       linux,code = <BTN_0>;
+                       gpios = <&gpio0 0 GPIO_ACTIVE_LOW>;
+               };
+       };
+
        sound {
                compatible = "simple-audio-card";
                simple-audio-card,format = "i2s";
--
2.28.0