linux-kernel - [PATCH v2 3/6] arm64: dts: qcom: r0q: add touchscreen support

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Message-ID: <20251014044135.177210-4-ghatto404@gmail.com>
Date: Tue, 14 Oct 2025 00:41:32 -0400
From: Eric Gonçalves <ghatto404@...il.com>
To: Krzysztof Kozlowski <krzk@...nel.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konradybcio@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>
Cc: linux-arm-msm@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 3/6] arm64: dts: qcom: r0q: add touchscreen support

Enable the ST-Microelectronics FTS2BA61Y touchscreen. This patch
depends on "Input: add support for the STM FTS2BA61Y touchscreen".

The device has an issue where SPI 8 (the bus which the touchscreen is
connected to) is not working properly right now, so
spi-gpio is used instead.

Signed-off-by: Eric Gonçalves <ghatto404@...il.com>
---
 .../boot/dts/qcom/sm8450-samsung-r0q.dts      | 134 ++++++++++++++++++
 1 file changed, 134 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sm8450-samsung-r0q.dts b/arch/arm64/boot/dts/qcom/sm8450-samsung-r0q.dts
index 5ca45b040a99..96a8a0e69681 100644
--- a/arch/arm64/boot/dts/qcom/sm8450-samsung-r0q.dts
+++ b/arch/arm64/boot/dts/qcom/sm8450-samsung-r0q.dts
@@ -56,6 +56,50 @@ splash-region@...00000 {
 		};
 	};
 
+	/*
+	 * The device has an issue where SPI 8 (the bus which the touchscreen is
+	 * connected to) is not working properly right now, so spi-gpio
+	 * is used instead.
+	 */
+
+	spi8 {
+		compatible = "spi-gpio";
+		pinctrl-names = "default", "sleep";
+		pinctrl-0 = <&spi_clk_tsp_active &spi_mosi_tsp_active &spi_miso_tsp_active>;
+		pinctrl-1 = <&spi_clk_tsp_sleep &spi_mosi_tsp_sleep &spi_miso_tsp_sleep>;
+
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		sck-gpios = <&tlmm 30 GPIO_ACTIVE_HIGH>;
+		mosi-gpios = <&tlmm 29 GPIO_ACTIVE_HIGH>;
+		miso-gpios = <&tlmm 28 GPIO_ACTIVE_HIGH>;
+		cs-gpios = <&tlmm 31 GPIO_ACTIVE_LOW>;
+
+		num-chipselects = <1>;
+
+		spi-max-frequency = <5000000>;
+
+		touchscreen@0 {
+			compatible = "st,fts2ba61y";
+			reg = <0>;
+			spi-max-frequency = <5000000>;
+
+			vdd-supply = <&vreg_l8c_1p8>;
+			avdd-supply = <&vreg_l11c_3p0>;
+
+			interrupt-parent = <&tlmm>;
+			interrupts = <46 IRQ_TYPE_LEVEL_LOW>;
+
+			pinctrl-names = "default", "sleep";
+			pinctrl-0 = <&tsp_int_active>;
+			pinctrl-1 = <&tsp_int_sleep>;
+
+			status = "okay";
+		};
+	};
+
 	vph_pwr: regulator-vph-pwr {
 		compatible = "regulator-fixed";
 		regulator-name = "vph_pwr";
@@ -138,6 +182,20 @@ vreg_l1c_1p8: ldo1 {
 			regulator-max-microvolt = <1800000>;
 			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
 		};
+
+		vreg_l8c_1p8: ldo8 {
+			regulator-name = "vreg_l8c_1p8";
+			regulator-min-microvolt = <1800000>;
+			regulator-max-microvolt = <1800000>;
+			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
+		};
+
+		vreg_l11c_3p0: ldo11 {
+			regulator-name = "vreg_l11c_3p0";
+			regulator-min-microvolt = <3000000>;
+			regulator-max-microvolt = <3000000>;
+			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
+		};
 	};
 };
 
@@ -162,6 +220,82 @@ &pon_resin {
 
 &tlmm {
 	gpio-reserved-ranges = <36 4>; /* SPI (Unused) */
+
+	spi_clk_tsp_active: spi-clk-tsp-active {
+		pins = "gpio30";
+		function = "gpio";
+		drive-strength = <6>;
+		bias-disable;
+	};
+
+	spi_clk_tsp_sleep: spi-clk-tsp-sleep {
+		pins = "gpio30";
+		function = "gpio";
+		drive-strength = <6>;
+		input-enable;
+		bias-pull-down;
+	};
+
+	spi_cs_tsp_active: spi-cs-tsp-active {
+		pins = "gpio31";
+		function = "gpio";
+		drive-strength = <6>;
+		bias-disable;
+	};
+
+	spi_cs_tsp_sleep: spi-cs-tsp-sleep {
+		pins = "gpio31";
+		function = "gpio";
+		drive-strength = <6>;
+		input-enable;
+		bias-pull-down;
+	};
+
+	spi_miso_tsp_active: spi-miso-tsp-active {
+		pins = "gpio28";
+		function = "gpio";
+		drive-strength = <6>;
+		bias-disable;
+	};
+
+	spi_miso_tsp_sleep: spi-miso-tsp-sleep {
+		pins = "gpio28";
+		function = "gpio";
+		drive-strength = <6>;
+		input-enable;
+		bias-pull-down;
+	};
+
+	spi_mosi_tsp_active: spi-mosi-tsp-active {
+		pins = "gpio29";
+		function = "gpio";
+		drive-strength = <6>;
+		bias-disable;
+	};
+
+	spi_mosi_tsp_sleep: spi-mosi-tsp-sleep {
+		pins = "gpio29";
+		function = "gpio";
+		drive-strength = <6>;
+		input-enable;
+		bias-pull-down;
+	};
+
+	tsp_int_active: tsp-int-active {
+		pins = "gpio46";
+		function = "gpio";
+		drive-strength = <2>;
+		input-enable;
+		bias-disable;
+	};
+
+	tsp_int_sleep: tsp-int-sleep-state {
+		pins = "gpio46";
+		function = "gpio";
+		drive-strength = <2>;
+		input-enable;
+		bias-disable;
+	};
 };
 
 &usb_1 {
-- 
2.51.0