arm64: dts: rockchip: add ADC buttons to rk3588-evb1

The Rockchip EVB1 has a couple of buttons connected via an ADC
line. Let's add them to its devicetree.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Link: https://lore.kernel.org/r/20231005134357.37171-1-sebastian.reichel@collabora.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

diff --git a/arch/arm64/boot/dts/rockchip/rk3588-evb1-v10.dts b/arch/arm64/boot/dts/rockchip/rk3588-evb1-v10.dts
index c3fe58e39e99f1d84904e2f7f47ab08d66dd517e..b9d789d57862c2def973671cb4de41ea91b0bba5 100644 (file)
--- a/arch/arm64/boot/dts/rockchip/rk3588-evb1-v10.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3588-evb1-v10.dts
@@ -7,6 +7,7 @@
 /dts-v1/;
 
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
 #include <dt-bindings/pinctrl/rockchip.h>
 #include "rk3588.dtsi"
 
@@ -23,6 +24,38 @@
                stdout-path = "serial2:1500000n8";
        };
 
+       adc-keys {
+               compatible = "adc-keys";
+               io-channels = <&saradc 1>;
+               io-channel-names = "buttons";
+               keyup-threshold-microvolt = <1800000>;
+               poll-interval = <100>;
+
+               button-vol-up {
+                       label = "Volume Up";
+                       linux,code = <KEY_VOLUMEUP>;
+                       press-threshold-microvolt = <17000>;
+               };
+
+               button-vol-down {
+                       label = "Volume Down";
+                       linux,code = <KEY_VOLUMEDOWN>;
+                       press-threshold-microvolt = <417000>;
+               };
+
+               button-menu {
+                       label = "Menu";
+                       linux,code = <KEY_MENU>;
+                       press-threshold-microvolt = <890000>;
+               };
+
+               button-escape {
+                       label = "Escape";
+                       linux,code = <KEY_ESC>;
+                       press-threshold-microvolt = <1235000>;
+               };
+       };
+
        backlight: backlight {
                compatible = "pwm-backlight";
                power-supply = <&vcc12v_dcin>;
@@ -286,6 +319,11 @@
        status = "okay";
 };
 
+&saradc {
+       vref-supply = <&vcc_1v8_s0>;
+       status = "okay";
+};
+
 &sdhci {
        bus-width = <8>;
        no-sdio;