[PATCH v6 11/12] riscv: add DT binding for BOOT button on Maix board

[Sean Anderson]

From: Heinrich Schuchardt <xypron.glpk at gmx.de>

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

Signed-off-by: Heinrich Schuchardt <xypron.glpk at gmx.de>
Reviewed-by: Sean Anderson <seanga2 at gmail.com>
Signed-off-by: Sean Anderson <seanga2 at gmail.com>
---
This commit was previously submitted on its own as
https://patchwork.ozlabs.org/project/uboot/patch/20200902201159.98034-1-xypron.glpk@gmx.de/

The following is the original commit note:

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.

Changes in v6:
- New

 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