linux-kernel - [PATCH 2/3] arm64: dts: mediatek: mt8395-nio-12l: add PMIC and GPIO keys support

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Message-Id: <20250801-radxa-nio-12-l-gpio-v1-2-d0840f85d2c8@collabora.com>
Date: Fri, 01 Aug 2025 15:16:50 +0200
From: Julien Massot <julien.massot@...labora.com>
To: kernel@...labora.com, Dmitry Torokhov <dmitry.torokhov@...il.com>, 
 Matthias Brugger <matthias.bgg@...il.com>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: linux-input@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org, 
 devicetree@...r.kernel.org, Julien Massot <julien.massot@...labora.com>
Subject: [PATCH 2/3] arm64: dts: mediatek: mt8395-nio-12l: add PMIC and
 GPIO keys support

Add support for PMIC and GPIO keys on the Radxa NIO 12L board:
Declare a gpio-keys node for the Volume Up button using GPIO106.
Add the corresponding pin configuration in the pinctrl node.
Add a mediatek,mt6359-keys subnode under the PMIC to handle the
power and home buttons exposed by the MT6359.

Signed-off-by: Julien Massot <julien.massot@...labora.com>
---
 .../boot/dts/mediatek/mt8395-radxa-nio-12l.dts     | 36 ++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt8395-radxa-nio-12l.dts b/arch/arm64/boot/dts/mediatek/mt8395-radxa-nio-12l.dts
index 329c60cc6a6be0b4be8c0b8bb033b32d35302804..fd596e2298285361ad7c2fb828feec598d75a73e 100644
--- a/arch/arm64/boot/dts/mediatek/mt8395-radxa-nio-12l.dts
+++ b/arch/arm64/boot/dts/mediatek/mt8395-radxa-nio-12l.dts
@@ -8,6 +8,7 @@
 #include "mt8195.dtsi"
 #include "mt6359.dtsi"
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
 #include <dt-bindings/interrupt-controller/irq.h>
 #include <dt-bindings/pinctrl/mt8195-pinfunc.h>
 #include <dt-bindings/regulator/mediatek,mt6360-regulator.h>
@@ -60,6 +61,18 @@ backlight: backlight {
 		status = "disabled";
 	};
 
+	keys: gpio-keys {
+		compatible = "gpio-keys";
+
+		button-volume-up {
+			wakeup-source;
+			debounce-interval = <100>;
+			gpios = <&pio 106 GPIO_ACTIVE_LOW>;
+			label = "volume_up";
+			linux,code = <KEY_VOLUMEUP>;
+		};
+	};
+
 	wifi_vreg: regulator-wifi-3v3-en {
 		compatible = "regulator-fixed";
 		regulator-name = "wifi_3v3_en";
@@ -626,6 +639,14 @@ pins-txd {
 		};
 	};
 
+	gpio_key_pins: gpio-keys-pins {
+		pins {
+			pinmux = <PINMUX_GPIO106__FUNC_GPIO106>;
+			bias-pull-up;
+			input-enable;
+		};
+	};
+
 	i2c2_pins: i2c2-pins {
 		pins-bus {
 			pinmux = <PINMUX_GPIO12__FUNC_SDA2>,
@@ -880,6 +901,21 @@ &pciephy {
 
 &pmic {
 	interrupts-extended = <&pio 222 IRQ_TYPE_LEVEL_HIGH>;
+
+	mt6359keys: keys {
+		compatible = "mediatek,mt6359-keys";
+		mediatek,long-press-mode = <1>;
+		power-off-time-sec = <0>;
+
+		power-key {
+			linux,keycodes = <KEY_POWER>;
+			wakeup-source;
+		};
+
+		home {
+			linux,keycodes = <KEY_HOME>;
+		};
+	};
 };
 
 &scp {

-- 
2.50.1