Re: [PATCH v4 1/2] arm64: dts: qcom: shikra-iqs-evk: Add LT9611UXD HDMI bridge support

[Dmitry Baryshkov]

On Wed, Oct 07, 2026 at 06:21:06PM +0530, Mohit Dsor wrote:
> Enable the Shikra MDSS display subsystem on the Qualcomm Shikra IQS
> EVK board and add the Lontium LT9611UXD DSI-to-HDMI bridge node.
> 
> The LT9611UXD is connected via I2C (bus 4, address 0x41), powered by
> a GPIO-controlled 3.3V regulator (PM8150 GPIO4) and an always-on 1.8V
> rail. Reset is on GPIO76 and interrupt on GPIO85.
> 
> The bridge receives DSI output from MDSS and drives an HDMI-A
> connector, with the link wired as: DPU -> DSI0 -> LT9611UXD -> HDMI.
> 
> Regulator and pinctrl labels use generic board-level names
> (vreg_disp_3p3, bridge_irq_pin, bridge_rst_pin) to decouple them
> from the bridge chip.
> 
> Signed-off-by: Mohit Dsor <mohit.dsor@xxxxxxxxxxxxxxxx>
> ---
>  arch/arm64/boot/dts/qcom/shikra-iqs-evk.dts | 109 ++++++++++++++++++++++++++++
>  1 file changed, 109 insertions(+)
> 
> +
> +&i2c4 {
> +	status = "okay";
> +
> +	lt9611uxd: lt9611uxd@41 {

unused label. rename the node to hdmi-bridge

> +		compatible = "lontium,lt9611uxd";
> +		reg = <0x41>;
> +		interrupts-extended = <&tlmm 85 IRQ_TYPE_EDGE_FALLING>;
> +		reset-gpios = <&tlmm 76 GPIO_ACTIVE_LOW>;
> +		vcc-supply = <&vreg_disp_3p3>;
> +		vdd-supply = <&pm8150_s4>;
> +
> +		pinctrl-0 = <&bridge_irq_pin &bridge_rst_pin>;
> +		pinctrl-names = "default";
> +
> +		ports {
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +
> +			port@0 {
> +				reg = <0>;
> +
> +				lt9611_a: endpoint {
> +					remote-endpoint = <&mdss_dsi0_out>;
> +				};
> +			};
> +
> +			port@2 {
> +				reg = <2>;
> +
> +				lt9611_out: endpoint {
> +					remote-endpoint = <&hdmi_con>;

hdmi_connector_out

> +				};
> +			};
> +		};
> +	};
> +};
> +
> @@ -67,6 +160,22 @@ &sdhc_2 {
>  	status = "okay";
>  };
>  
> +&tlmm {
> +	bridge_irq_pin: bridge-irq-state {
> +		pins = "gpio85";
> +		function = "gpio";
> +		drive-strength = <2>;
> +		bias-disable;
> +	};
> +
> +	bridge_rst_pin: bridge-rst-state {

I think the current recommendation is to sort them by the pin number.

> +		pins = "gpio76";
> +		function = "gpio";
> +		drive-strength = <8>;
> +		bias-disable;
> +	};
> +};
> +
>  &usb_1_hsphy {
>  	vdd-supply = <&pm8150_l4>;
>  	vdda-pll-supply = <&pm8150_l12>;
> 
> -- 
> 2.34.1
> 

-- 
With best wishes
Dmitry