linux-kernel - [PATCH v2 1/2] arm64: dts: mediatek: mt8395-nio-12l: Prepare MIPI DSI port

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Message-Id: <20250304-radxa-panel-overlay-v2-1-3ee6797d3f86@collabora.com>
Date: Tue, 04 Mar 2025 15:01:55 +0100
From: Julien Massot <julien.massot@...labora.com>
To: kernel@...labora.com, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Matthias Brugger <matthias.bgg@...il.com>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org, 
 kernel@...labora.com, Julien Massot <julien.massot@...labora.com>
Subject: [PATCH v2 1/2] arm64: dts: mediatek: mt8395-nio-12l: Prepare MIPI
 DSI port

This board can use a MIPI-DSI panel on the DSI0 connector: in
preparation for adding an overlay for the Radxa Display 8HD,
add the backlight, and some definitions for pins available
through the DSI0 port.

Signed-off-by: Julien Massot <julien.massot@...labora.com>
---
 .../boot/dts/mediatek/mt8395-radxa-nio-12l.dts     | 45 ++++++++++++++++++++++
 1 file changed, 45 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 7184dc99296c7f5d749c7e6d378722677970b3b7..1c922e98441a1aadf0aa3cdd76583a70401a1fa3 100644
--- a/arch/arm64/boot/dts/mediatek/mt8395-radxa-nio-12l.dts
+++ b/arch/arm64/boot/dts/mediatek/mt8395-radxa-nio-12l.dts
@@ -48,6 +48,18 @@ memory@...00000 {
 		reg = <0 0x40000000 0x1 0x0>;
 	};
 
+	backlight: backlight {
+		compatible = "pwm-backlight";
+		brightness-levels = <0 1023>;
+		default-brightness-level = <576>;
+		enable-gpios = <&pio 107 GPIO_ACTIVE_HIGH>;
+		num-interpolated-steps = <1023>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&dsi0_backlight_pins>;
+		pwms = <&disp_pwm0 0 500000>;
+		status = "disabled";
+	};
+
 	wifi_vreg: regulator-wifi-3v3-en {
 		compatible = "regulator-fixed";
 		regulator-name = "wifi_3v3_en";
@@ -502,6 +514,13 @@ &mt6359_vsram_others_ldo_reg {
 &pio {
 	mediatek,rsel-resistance-in-si-unit;
 
+	dsi0_backlight_pins: dsi0-backlight-pins {
+		pins-backlight-en {
+			pinmux = <PINMUX_GPIO107__FUNC_GPIO107>;
+			output-high;
+		};
+	};
+
 	eth_default_pins: eth-default-pins {
 		pins-cc {
 			pinmux = <PINMUX_GPIO85__FUNC_GBE_TXC>,
@@ -699,6 +718,13 @@ pins-irq {
 		};
 	};
 
+	panel_default_pins: panel-pins {
+		pins-rst {
+			pinmux = <PINMUX_GPIO108__FUNC_GPIO108>;
+			bias-pull-up;
+		};
+	};
+
 	pcie0_default_pins: pcie0-default-pins {
 		pins-bus {
 			pinmux = <PINMUX_GPIO19__FUNC_WAKEN>,
@@ -717,6 +743,12 @@ pins-bus {
 		};
 	};
 
+	pwm0_default_pins: pwm0-pins {
+		pins-disp-pwm {
+			pinmux = <PINMUX_GPIO97__FUNC_DISP_PWM0>;
+		};
+	};
+
 	spi1_pins: spi1-default-pins {
 		pins-bus {
 			pinmux = <PINMUX_GPIO136__FUNC_SPIM1_CSB>,
@@ -737,6 +769,19 @@ pins-bus {
 		};
 	};
 
+	touch_pins: touch-pins {
+		pins-touch-int {
+			pinmux = <PINMUX_GPIO132__FUNC_GPIO132>;
+			input-enable;
+			bias-disable;
+		};
+
+		pins-touch-rst {
+			pinmux = <PINMUX_GPIO133__FUNC_GPIO133>;
+			output-high;
+		};
+	};
+
 	uart0_pins: uart0-pins {
 		pins-bus {
 			pinmux = <PINMUX_GPIO98__FUNC_UTXD0>,

-- 
2.48.1