[PATCH v5] arm64: dts: qcom: sm6125-xiaomi-laurel-sprout: Add Focaltech FT3518 touchscreen

Yedaya Katsman via B4 Relay
2026-02-08T21:24:27Z

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

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

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@protonmail.com>
Signed-off-by: Kamil Gołda <kamil.golda@protonmail.com>
Signed-off-by: Yedaya Katsman <yedaya.ka@gmail.com>
---
Adds support for the touchscreen in the Xiaomi Mi A3 (xiaomi-laurel)
smartphone, FocalTech FT3518

Original tree was here:
Link: https://gitlab.postmarketos.org/SzczurekYT/linux/-/commits/laurel
---
Changes in v5:
- Add pin config for ts vdd
- Reorder some properties
- Drop applied patches
- Link to v4: https://lore.kernel.org/r/20260120-touchscreen-patches-v4-0-30145da9d6d3@gmail.com

Changes in v4:
- Follow dts coding style for pinctrl nodes
- Don't refrence touchscreen "release" gpio config
- Link to v3: https://lore.kernel.org/r/20260118-touchscreen-patches-v3-0-1c6a729c5eb4@gmail.com

Changes in v3:
- Rename regulator node and reorder nodes
- Add gpio pin configuration for pmx_ts_* in sm6125, and reference in the
touchscreen configuration as pinctrl-*. Doesn't have configuration for
the gpio 83 pin since it isn't documented downstream.
- Link to v2: https://lore.kernel.org/r/20260114-touchscreen-patches-v2-0-4215f94c8aba@gmail.com

Changes in v2:
- Fixed name and email in signoffs
- Link to v1: https://lore.kernel.org/r/20260113-touchscreen-patches-v1-0-a10957f32dd8@gmail.com
---
.../boot/dts/qcom/sm6125-xiaomi-laurel-sprout.dts | 73 ++++++++++++++++++++++
1 file changed, 73 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..97f64cb5d570e018ef666612f3839c4e6759ac7b 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 +82,19 @@ 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>;
+ startup-delay-us = <70000>;
+
+ enable-active-high;
+ gpio = <&tlmm 83 GPIO_ACTIVE_HIGH>;
+ pinctrl-0 = <&ts_vdd_en>;
+ pinctrl-names = "default";
+ };
+
thermal-zones {
rf-pa0-thermal {
thermal-sensors = <&pm6125_adc_tm 0>;
@@ -128,6 +141,27 @@ &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-0 = <&ts_int_active &ts_reset_active>;
+ pinctrl-1 = <&ts_int_suspend &ts_reset_suspend>;
+ pinctrl-names = "default","sleep";
+
+ 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 +254,10 @@ &pon_resin {
status = "okay";
};

+&qupv3_id_0 {
+ status = "okay";
+};
+
&rpm_requests {
regulators-0 {
compatible = "qcom,rpm-pm6125-regulators";
@@ -387,6 +425,41 @@ &sdhc_2 {

&tlmm {
gpio-reserved-ranges = <22 2>, <28 6>;
+
+ ts_vdd_en: ts-vdd-default-state {
+ pins = "gpio83";
+ function = "gpio";
+ drive-strength = <2>;
+ bias-disable;
+ };
+
+ 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 {

---
base-commit: 9845cf73f7db6094c0d8419d6adb848028f4a921
change-id: 20260113-touchscreen-patches-beb2526bd5fb

Best regards,
--
Yedaya Katsman <yedaya.ka@gmail.com>