arm64: dts: amlogic: meson-s4-s905y4-khadas-vim1s: add Function key support

Enable the SARADC controller and add the adc-keys node to support
the Function key found on the Khadas VIM1S board.

Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Nick Xie <nick@khadas.com>
Link: https://patch.msgid.link/20260325070618.81955-5-nick@khadas.com
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>

diff --git a/arch/arm64/boot/dts/amlogic/meson-s4-s905y4-khadas-vim1s.dts b/arch/arm64/boot/dts/amlogic/meson-s4-s905y4-khadas-vim1s.dts
index 664d64a267f2d2712fa1a43ad0b58bf9afe8a7c3..792ab45c4c94446a7641349a9c11c494f2b1f095 100644 (file)
--- a/arch/arm64/boot/dts/amlogic/meson-s4-s905y4-khadas-vim1s.dts
+++ b/arch/arm64/boot/dts/amlogic/meson-s4-s905y4-khadas-vim1s.dts
@@ -40,6 +40,20 @@
                };
        };
 
+       adc-keys {
+               compatible = "adc-keys";
+               io-channels = <&saradc 0>;
+               io-channel-names = "buttons";
+               keyup-threshold-microvolt = <1710000>;
+               poll-interval = <100>;
+
+               button-function {
+                       label = "Function";
+                       linux,code = <KEY_FN>;
+                       press-threshold-microvolt = <10000>;
+               };
+       };
+
        emmc_pwrseq: emmc-pwrseq {
                compatible = "mmc-pwrseq-emmc";
                reset-gpios = <&gpio GPIOB_9 GPIO_ACTIVE_LOW>;
@@ -278,6 +292,11 @@
        };
 };
 
+&saradc {
+       status = "okay";
+       vref-supply = <&vddio_ao1v8>;
+};
+
 &spicc0 {
        status = "okay";
        pinctrl-names = "default";