[PATCH] arm64: dts: qcom: mahua-lenovo-thinkpad-t14s-gen7: Add touchscreen support

[PATCH] arm64: dts: qcom: mahua-lenovo-thinkpad-t14s-gen7: Add touchscreen support

[Abel Vesa]

The touch SKU of the ThinkPad T14s Gen 7 has a HID-over-I2C
touchscreen (Parade, HID 1da0:3009) at address 0x24 on QUP i2c8.
Its interrupt is GPIO 51 (level, active low) and GPIO 48 is the
active-low reset line, which is kept deasserted.

Describe it so the touchscreen works.

Signed-off-by: Abel Vesa <abel.vesa@oss.qualcomm.com>
---
 .../qcom/mahua-lenovo-thinkpad-t14s-gen7-lcd.dts   | 34 ++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/mahua-lenovo-thinkpad-t14s-gen7-lcd.dts b/arch/arm64/boot/dts/qcom/mahua-lenovo-thinkpad-t14s-gen7-lcd.dts
index 26d6d8285e04..f19ec3aa89a1 100644
--- a/arch/arm64/boot/dts/qcom/mahua-lenovo-thinkpad-t14s-gen7-lcd.dts
+++ b/arch/arm64/boot/dts/qcom/mahua-lenovo-thinkpad-t14s-gen7-lcd.dts
@@ -735,6 +735,23 @@ ptn3222_fpr: redriver@4f {
 	};
 };
 
+&i2c8 {
+	clock-frequency = <400000>;
+
+	status = "okay";
+
+	touchscreen@24 {
+		compatible = "hid-over-i2c";
+		reg = <0x24>;
+
+		hid-descr-addr = <0x1>;
+		interrupts-extended = <&tlmm 51 IRQ_TYPE_LEVEL_LOW>;
+
+		pinctrl-0 = <&ts0_default>;
+		pinctrl-names = "default";
+	};
+};
+
 &lpass_vamacro {
 	pinctrl-0 = <&dmic01_default>;
 	pinctrl-names = "default";
@@ -1101,6 +1118,23 @@ tpad_default: tpad-default-state {
 		bias-disable;
 	};
 
+	ts0_default: ts0-default-state {
+		int-n-pins {
+			pins = "gpio51";
+			function = "gpio";
+			drive-strength = <2>;
+			bias-pull-up;
+		};
+
+		reset-n-pins {
+			pins = "gpio48";
+			function = "gpio";
+			drive-strength = <2>;
+			bias-disable;
+			output-high;
+		};
+	};
+
 	wcn_wlan_bt_en: wcn-wlan-bt-en-state {
 		pins = "gpio116", "gpio117";
 		function = "gpio";

---
base-commit: ddfe51b0a0f5dc9e415cc2c8ad8db17532dd426b
change-id: 20261106-mahua-t14s-gen7-touchscreen-9f6356c88b96

Best regards,
--  

Abel

Re: [PATCH] arm64: dts: qcom: mahua-lenovo-thinkpad-t14s-gen7: Add touchscreen support

[Konrad Dybcio]

On 11/6/26 9:47 PM, Abel Vesa wrote:
> The touch SKU of the ThinkPad T14s Gen 7 has a HID-over-I2C
> touchscreen (Parade, HID 1da0:3009) at address 0x24 on QUP i2c8.
> Its interrupt is GPIO 51 (level, active low) and GPIO 48 is the
> active-low reset line, which is kept deasserted.
> 
> Describe it so the touchscreen works.
> 
> Signed-off-by: Abel Vesa <abel.vesa@oss.qualcomm.com>
> ---

[...]
> +	ts0_default: ts0-default-state {
> +		int-n-pins {
> +			pins = "gpio51";
> +			function = "gpio";
> +			drive-strength = <2>;
> +			bias-pull-up;
> +		};
> +
> +		reset-n-pins {
> +			pins = "gpio48";
> +			function = "gpio";
> +			drive-strength = <2>;
> +			bias-disable;
> +			output-high;

I'm afraid you'll need to add specific bindings for this touchscreen
instead, see:

https://lore.kernel.org/lkml/82a96d57-94fc-470a-b7eb-f0fde0c0dad6@oss.qualcomm.com/

Konrad