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

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

Add pmx_ts_* gpio configurations and reference them in the touchscreen
node.
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@protonmail.com>
Signed-off-by: Kamil Gołda <kamil.golda@protonmail.com>
Signed-off-by: Yedaya Katsman <yedaya.ka@gmail.com>
---
 .../boot/dts/qcom/sm6125-xiaomi-laurel-sprout.dts  | 113 +++++++++++++++++++++
 1 file changed, 113 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..5e55acacee9585f34eead20661268103f0b7889c 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 +140,28 @@ &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 = "pmx_ts_active","pmx_ts_suspend","pmx_ts_release";
+		pinctrl-0 = <&ts_int_active &ts_reset_active>;
+		pinctrl-1 = <&ts_int_suspend &ts_reset_suspend>;
+		pinctrl-2 = <&ts_release>;
+
+		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 +425,81 @@ &sdhc_2 {
 
 &tlmm {
 	gpio-reserved-ranges = <22 2>, <28 6>;
+
+	pmx_ts_reset_active {
+		ts_reset_active: ts_reset_active {
+			mux {
+				pins = "gpio87";
+				function = "gpio";
+			};
+
+			config {
+				pins = "gpio87";
+				drive-strength = <8>;
+				bias-pull-up;
+			};
+		};
+	};
+
+	pmx_ts_reset_suspend {
+		ts_reset_suspend: ts_reset_suspend {
+			mux {
+				pins = "gpio87";
+				function = "gpio";
+			};
+
+			config {
+				pins = "gpio87";
+				drive-strength = <2>;
+				bias-pull-down;
+			};
+		};
+	};
+
+	pmx_ts_int_active {
+		ts_int_active: ts_int_active {
+			mux {
+				pins = "gpio88";
+				function = "gpio";
+			};
+
+			config {
+				pins = "gpio88";
+				drive-strength = <8>;
+				bias-pull-up;
+			};
+		};
+	};
+
+	pmx_ts_int_suspend {
+		ts_int_suspend: ts_int_suspend {
+			mux {
+				pins = "gpio88";
+				function = "gpio";
+			};
+
+			config {
+				pins = "gpio88";
+				drive-strength = <2>;
+				bias-pull-down;
+			};
+		};
+	};
+
+	pmx_ts_release {
+		ts_release: ts_release {
+			mux {
+				pins = "gpio87", "gpio88";
+				function = "gpio";
+			};
+
+			config {
+				pins = "gpio87", "gpio88";
+				drive-strength = <2>;
+				bias-pull-down;
+			};
+		};
+	};
 };
 
 &ufs_mem_hc {

-- 
2.52.0

On 1/18/26 9:29 PM, Yedaya Katsman via B4 Relay wrote:
> From: Yedaya Katsman <yedaya.ka@gmail.com>
> 
> Add device tree node for the Focaltech FT3518 touchscreen on
> Xiaomi Mi A3 (laurel-sprout).
> 
> Add pmx_ts_* gpio configurations and reference them in the touchscreen
> node.
> 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@protonmail.com>
> Signed-off-by: Kamil Gołda <kamil.golda@protonmail.com>
> Signed-off-by: Yedaya Katsman <yedaya.ka@gmail.com>
> ---

[...]

>  &tlmm {
>  	gpio-reserved-ranges = <22 2>, <28 6>;
> +
> +	pmx_ts_reset_active {

Node names must end in -state and you should use dashes instead of
underscores in node names ('make dtbs_check' would tell you at least
one of these things)

> +		ts_reset_active: ts_reset_active {
> +			mux {

Please drop the intermediate nodes and put the properties directly
under the foo-state {} node. The indirection is useful when we're
defining multiple pins with the exact same settings (e.g. 4 lanes
of SDIO)

Konrad

On 18/01/2026 21:29, Yedaya Katsman via B4 Relay wrote:
> +
>  &rpm_requests {
>  	regulators-0 {
>  		compatible = "qcom,rpm-pm6125-regulators";
> @@ -387,6 +425,81 @@ &sdhc_2 {
>  
>  &tlmm {
>  	gpio-reserved-ranges = <22 2>, <28 6>;
> +
> +	pmx_ts_reset_active {

You must follow DTS coding style. Do not copy here code from downstream,
ever.

Best regards,
Krzysztof