Re: [Linux-stm32] [PATCH 09/12] arm64: dts: st: add lvds support on stm32mp255

[Clement LE GOFFIC <clement.legoffic@foss.st.com>]

Hi Raphael,

On 7/25/25 12:04, Raphael Gallais-Pou wrote:
> The LVDS is used on STM32MP2 as a display interface.
> 
> Add the LVDS node.
> 
> Signed-off-by: Raphael Gallais-Pou <raphael.gallais-pou@foss.st.com>
> ---
>   arch/arm64/boot/dts/st/stm32mp255.dtsi | 12 ++++++++++++
>   1 file changed, 12 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/st/stm32mp255.dtsi b/arch/arm64/boot/dts/st/stm32mp255.dtsi
> index f689b47c5010033120146cf1954d6624c0270045..a4d965f785fa42c4597494010855aec7e1b9fdd1 100644
> --- a/arch/arm64/boot/dts/st/stm32mp255.dtsi
> +++ b/arch/arm64/boot/dts/st/stm32mp255.dtsi
> @@ -6,6 +6,18 @@
>   #include "stm32mp253.dtsi"
>   
>   &rifsc {
> +	lvds: lvds@48060000 {
> +		compatible = "st,stm32mp25-lvds";

For the compatible you now need one comaptible per SoC.
It means your compatible should look like : "st,stm32mp251-lvds".
This way, if on the 253 or 255 there is an issue you are able to easily 
add match data in the driver with compatible "st,stm32mp253-lvds" or 
"st,stm32mp255-lvds".
A prior discussion on this subject has been raised on my V1 of HDP 
involving Krzysztof and Alexandre :
https://lore.kernel.org/all/418a80a9-8c08-4dd1-bf49-1bd7378321aa@kernel.org/

> +		#clock-cells = <0>;
> +		reg = <0x48060000 0x2000>;
> +		clocks = <&rcc CK_BUS_LVDS>, <&rcc CK_KER_LVDSPHY>;
> +		clock-names = "pclk", "ref";
> +		resets = <&rcc LVDS_R>;
> +		access-controllers = <&rifsc 84>;
> +		power-domains = <&CLUSTER_PD>;
> +		status = "disabled";
> +	};
> +
>   	vdec: vdec@480d0000 {
>   		compatible = "st,stm32mp25-vdec";
>   		reg = <0x480d0000 0x3c8>;
> 

Best regards,
Clément