linux-kernel - [PATCH] ARM: dts: stm32: add goodix touchscreen on stm32mp135f-dk

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Date: Mon, 6 May 2024 16:49:45 +0200
From: Yannick Fertre <yannick.fertre@...s.st.com>
To: Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski
	<krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue
	<alexandre.torgue@...s.st.com>,
        Philippe Cornu <philippe.cornu@...s.st.com>,
        <devicetree@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] ARM: dts: stm32: add goodix touchscreen on stm32mp135f-dk

Touchscreen reset needs to be configured
via the pinctrl not the driver (a pull-down resistor
has been soldered onto the reset line which forces
the touchscreen to reset state).
Interrupt line must have a pull-down resistor
in order to freeze the i2c address at 0x5D.

Signed-off-by: Yannick Fertre <yannick.fertre@...s.st.com>
---
 arch/arm/boot/dts/st/stm32mp13-pinctrl.dtsi | 22 +++++++++++++++++++++
 arch/arm/boot/dts/st/stm32mp135f-dk.dts     | 14 +++++++++++++
 2 files changed, 36 insertions(+)

diff --git a/arch/arm/boot/dts/st/stm32mp13-pinctrl.dtsi b/arch/arm/boot/dts/st/stm32mp13-pinctrl.dtsi
index 32c5d8a1e06a..21861cae21d9 100644
--- a/arch/arm/boot/dts/st/stm32mp13-pinctrl.dtsi
+++ b/arch/arm/boot/dts/st/stm32mp13-pinctrl.dtsi
@@ -13,6 +13,28 @@ pins {
 		};
 	};
 
+	goodix_pins_a: goodix-0 {
+		/*
+		 * touchscreen reset needs to be configured
+		 * via the pinctrl not the driver (a pull-down resistor
+		 * has been soldered onto the reset line which forces
+		 * the touchscreen to reset state).
+		 */
+		pins1 {
+			pinmux = <STM32_PINMUX('H', 2, GPIO)>;
+			output-high;
+			bias-pull-up;
+		};
+		/*
+		 * Interrupt line must have a pull-down resistor
+		 * in order to freeze the i2c address at 0x5D
+		 */
+		pins2 {
+			pinmux = <STM32_PINMUX('F', 5, GPIO)>;
+			bias-pull-down;
+		};
+	};
+
 	i2c1_pins_a: i2c1-0 {
 		pins {
 			pinmux = <STM32_PINMUX('D', 12, AF5)>, /* I2C1_SCL */
diff --git a/arch/arm/boot/dts/st/stm32mp135f-dk.dts b/arch/arm/boot/dts/st/stm32mp135f-dk.dts
index 567e53ad285f..5e8ee2d4648a 100644
--- a/arch/arm/boot/dts/st/stm32mp135f-dk.dts
+++ b/arch/arm/boot/dts/st/stm32mp135f-dk.dts
@@ -201,6 +201,20 @@ &i2c5 {
 	/* spare dmas for other usage */
 	/delete-property/dmas;
 	/delete-property/dma-names;
+
+	goodix: goodix-ts@5d {
+		compatible = "goodix,gt911";
+		reg = <0x5d>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&goodix_pins_a>;
+		interrupt-parent = <&gpiof>;
+		interrupts = <5 IRQ_TYPE_EDGE_FALLING>;
+		AVDD28-supply = <&scmi_v3v3_sw>;
+		VDDIO-supply = <&scmi_v3v3_sw>;
+		touchscreen-size-x = <480>;
+		touchscreen-size-y = <272>;
+		status = "okay" ;
+	};
 };
 
 &iwdg2 {
-- 
2.34.1