Re: [PATCH 1/3] arm64: dts: imx8mm-tqma8mqml-mba8mx: Add DSI-LVDS bridge node

[Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>]

On 21/08/2023 15:40, Alexander Stein wrote:
> This adds the DSI-LVDS bridge including the regulator, backlight and
> an unspecified panel. It is expected to set the compatible when the
> display chain is enabled.
> 
> Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
> ---
>  .../dts/freescale/imx8mm-tqma8mqml-mba8mx.dts | 29 ++++++++
>  .../boot/dts/freescale/imx8mm-tqma8mqml.dtsi  |  5 ++
>  arch/arm64/boot/dts/freescale/mba8mx.dtsi     | 68 +++++++++++++++++++
>  3 files changed, 102 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8mm-tqma8mqml-mba8mx.dts b/arch/arm64/boot/dts/freescale/imx8mm-tqma8mqml-mba8mx.dts
> index 156d793a0c972..b2b825d990a62 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mm-tqma8mqml-mba8mx.dts
> +++ b/arch/arm64/boot/dts/freescale/imx8mm-tqma8mqml-mba8mx.dts
> @@ -56,6 +56,19 @@ usb_dr_connector: endpoint {
>  	};
>  };
>  
> +&dsi_lvds_bridge {
> +	ports {
> +		port@0 {
> +			reg = <0>;
> +
> +			lvds_bridge_in: endpoint {
> +				data-lanes = <1 2 3 4>;
> +				remote-endpoint = <&mipi_dsi_out>;
> +			};
> +		};
> +	};
> +};
> +
>  &i2c1 {
>  	expander2: gpio@27 {
>  		compatible = "nxp,pca9555";
> @@ -72,6 +85,22 @@ expander2: gpio@27 {
>  	};
>  };
>  
> +&mipi_dsi {
> +	samsung,burst-clock-frequency = <891000000>;
> +	samsung,esc-clock-frequency = <20000000>;
> +
> +	ports {
> +		port@1 {
> +			reg = <1>;
> +
> +			mipi_dsi_out: endpoint {
> +				data-lanes = <1 2 3 4>;
> +				remote-endpoint = <&lvds_bridge_in>;
> +			};
> +		};
> +	};
> +};
> +
>  &pcie_phy {
>  	clocks = <&pcie0_refclk>;
>  	status = "okay";
> diff --git a/arch/arm64/boot/dts/freescale/imx8mm-tqma8mqml.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-tqma8mqml.dtsi
> index b4466a26d838a..8c0c6e7159247 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mm-tqma8mqml.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mm-tqma8mqml.dtsi
> @@ -230,6 +230,11 @@ eeprom0: eeprom@57 {
>  	};
>  };
>  
> +&mipi_dsi {
> +	vddcore-supply = <&ldo4_reg>;
> +	vddio-supply = <&ldo3_reg>;
> +};
> +
>  &pcie_phy {
>  	fsl,refclk-pad-mode = <IMX8_PCIE_REFCLK_PAD_INPUT>;
>  	fsl,clkreq-unsupported;
> diff --git a/arch/arm64/boot/dts/freescale/mba8mx.dtsi b/arch/arm64/boot/dts/freescale/mba8mx.dtsi
> index 8a9fe5cdcc98a..269e604cb1574 100644
> --- a/arch/arm64/boot/dts/freescale/mba8mx.dtsi
> +++ b/arch/arm64/boot/dts/freescale/mba8mx.dtsi
> @@ -8,6 +8,16 @@
>  /* TQ-Systems GmbH MBa8Mx baseboard */
>  
>  / {
> +	backlight_lvds0: backlight0 {

Why 0?

> +		compatible = "pwm-backlight";
> +		pwms = <&pwm3 0 5000000 0>;
> +		brightness-levels = <0 4 8 16 32 64 128 255>;
> +		default-brightness-level = <7>;
> +		power-supply = <&reg_12v>;
> +		enable-gpios = <&expander2 2 GPIO_ACTIVE_HIGH>;
> +		status = "disabled";
> +	};
> +
>  	beeper {
>  		compatible = "pwm-beeper";
>  		pwms = <&pwm4 0 250000 0>;
> @@ -65,12 +75,45 @@ led2: led2 {
>  		};
>  	};
>  
> +	gpio_delays: gpio-delays {
> +		compatible = "gpio-delay";
> +		#gpio-cells = <3>;
> +		gpio-controller;
> +		gpios = <&expander0 6 GPIO_ACTIVE_HIGH>;
> +		gpio-line-names = "LVDS_BRIDGE_EN_1V8";
> +	};
> +
> +	panel0: panel_lvds0 {

No underscores in node names. Why 0?



Best regards,
Krzysztof