linux-kernel - [PATCH v4 3/3] arm64: dts: qcom: sm6125-xiaomi-laurel-sprout: Add Focaltech FT3518 touchscreen

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Message-Id: <20260120-touchscreen-patches-v4-3-30145da9d6d3@gmail.com>
Date: Tue, 20 Jan 2026 23:40:56 +0200
From: Yedaya Katsman via B4 Relay <devnull+yedaya.ka.gmail.com@...nel.org>
To: Kamil Gołda <kamil.golda@...tonmail.com>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konradybcio@...nel.org>
Cc: linux-input@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org, 
 Yedaya Katsman <yedaya.ka@...il.com>
Subject: [PATCH v4 3/3] arm64: dts: qcom: sm6125-xiaomi-laurel-sprout: Add
 Focaltech FT3518 touchscreen

From: Yedaya Katsman <yedaya.ka@...il.com>

Add device tree node for the Focaltech FT3518 touchscreen on
Xiaomi Mi A3 (laurel-sprout).

Note that gpio pin 83 for the regulator isn't documented downstream
except in the touchscreen node so it's not defined in the tlmm.

Enable qupv3_id_0 and i2c2 bus that the touchscreen is on.

Downstream references:
Link: https://github.com/MiCode/Xiaomi_Kernel_OpenSource/blob/laurel-r-oss/arch/arm64/boot/dts/qcom/trinket-pinctrl.dtsi
Link: https://github.com/MiCode/Xiaomi_Kernel_OpenSource/blob/laurel-r-oss/arch/arm64/boot/dts/qcom/laurel_sprout-qrd.dtsi

Co-developed-by: Kamil Gołda <kamil.golda@...tonmail.com>
Signed-off-by: Kamil Gołda <kamil.golda@...tonmail.com>
Signed-off-by: Yedaya Katsman <yedaya.ka@...il.com>
---
 .../boot/dts/qcom/sm6125-xiaomi-laurel-sprout.dts  | 65 ++++++++++++++++++++++
 1 file changed, 65 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sm6125-xiaomi-laurel-sprout.dts b/arch/arm64/boot/dts/qcom/sm6125-xiaomi-laurel-sprout.dts
index 994fb0412fcbdf5466f87a325c48b697a37b514b..ea9dbc6927a14ca66da818b81aeb0c95ec3c2e7a 100644
--- a/arch/arm64/boot/dts/qcom/sm6125-xiaomi-laurel-sprout.dts
+++ b/arch/arm64/boot/dts/qcom/sm6125-xiaomi-laurel-sprout.dts
@@ -82,6 +82,18 @@ key-volume-up {
 		};
 	};
 
+	ts_vdd_supply: regulator-ts-vdd {
+		compatible = "regulator-fixed";
+		regulator-name = "ts_vdd_supply";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+
+		gpio = <&tlmm 83 GPIO_ACTIVE_HIGH>;
+		enable-active-high;
+
+		startup-delay-us = <70000>;
+	};
+
 	thermal-zones {
 		rf-pa0-thermal {
 			thermal-sensors = <&pm6125_adc_tm 0>;
@@ -128,6 +140,27 @@ &hsusb_phy1 {
 	status = "okay";
 };
 
+&i2c2 {
+	status = "okay";
+
+	touchscreen@38 {
+		compatible = "focaltech,ft3518";
+		reg = <0x38>;
+		interrupts-extended = <&tlmm 88 IRQ_TYPE_EDGE_FALLING>;
+
+		vcc-supply = <&ts_vdd_supply>;
+
+		pinctrl-names = "default","sleep";
+		pinctrl-0 = <&ts_int_active &ts_reset_active>;
+		pinctrl-1 = <&ts_int_suspend &ts_reset_suspend>;
+
+		reset-gpios = <&tlmm 87 GPIO_ACTIVE_LOW>;
+
+		touchscreen-size-x = <720>;
+		touchscreen-size-y = <1560>;
+	};
+};
+
 &pm6125_adc {
 	pinctrl-names = "default";
 	pinctrl-0 = <&camera_flash_therm &emmc_ufs_therm>;
@@ -220,6 +253,10 @@ &pon_resin {
 	status = "okay";
 };
 
+&qupv3_id_0 {
+	status = "okay";
+};
+
 &rpm_requests {
 	regulators-0 {
 		compatible = "qcom,rpm-pm6125-regulators";
@@ -387,6 +424,34 @@ &sdhc_2 {
 
 &tlmm {
 	gpio-reserved-ranges = <22 2>, <28 6>;
+
+	ts_reset_active: pmx-ts-reset-active-state {
+		pins = "gpio87";
+		function = "gpio";
+		drive-strength = <8>;
+		bias-pull-up;
+	};
+
+	ts_reset_suspend: pmx-ts-reset-suspend-state {
+		pins = "gpio87";
+		function = "gpio";
+		drive-strength = <2>;
+		bias-pull-down;
+	};
+
+	ts_int_active: pmx-ts-int-active-state {
+		pins = "gpio88";
+		function = "gpio";
+		drive-strength = <8>;
+		bias-pull-up;
+	};
+
+	ts_int_suspend: pmx-ts-int-suspend-state {
+		pins = "gpio88";
+		function = "gpio";
+		drive-strength = <2>;
+		bias-pull-down;
+	};
 };
 
 &ufs_mem_hc {

-- 
2.52.0