From: Nick Xie <nick@khadas.com>
Date: Wed, 25 Mar 2026 07:06:18 +0000 (+0800)
Subject: arm64: dts: amlogic: meson-s4-s905y4-khadas-vim1s: add Function key support
X-Git-Url: http://git.ipfire.org/gitweb/?a=commitdiff_plain;h=def2d2379668d5e80a41d6d2fb0972f8480d9c2f;p=thirdparty%2Flinux.git

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 664d64a267f2d..792ab45c4c944 100644
--- 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";