linux-kernel - Re: [PATCH 11/13] ARM: dts: stm32: fix LTDC port node on STM32 MCU ad MPU

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Date:   Thu, 15 Apr 2021 15:21:26 +0200
From:   Marek Vasut <marex@...x.de>
To:     Alexandre Torgue <alexandre.torgue@...s.st.com>, arnd@...db.de,
        robh+dt@...nel.org, jagan@...rulasolutions.com,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Marcin Sloniewski <marcin.sloniewski@...il.com>,
        Ahmad Fatoum <a.fatoum@...gutronix.de>
Cc:     linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-kernel@...r.kernel.org, Lee Jones <lee.jones@...aro.org>,
        kuba@...nel.org
Subject: Re: [PATCH 11/13] ARM: dts: stm32: fix LTDC port node on STM32 MCU ad
 MPU

On 4/15/21 12:10 PM, Alexandre Torgue wrote:
> Running "make dtbs_check W=1", some warnings are reported concerning
> LTDC port subnode:
> 
> /soc/display-controller@...01000/port:
> unnecessary #address-cells/#size-cells without "ranges" or child "reg"
> property
> /soc/display-controller@...01000/port: graph node has single child node
> 'endpoint', #address-cells/#size-cells are not necessary

btw could you retain diffstat on your patches ? It's useful to see which 
files changed right away.

[...]

> diff --git a/arch/arm/boot/dts/stm32mp157c-dk2.dts b/arch/arm/boot/dts/stm32mp157c-dk2.dts
> index 2bc92ef3aeb9..19ef475a48fc 100644
> --- a/arch/arm/boot/dts/stm32mp157c-dk2.dts
> +++ b/arch/arm/boot/dts/stm32mp157c-dk2.dts
> @@ -82,9 +82,15 @@
>   };
>   
>   &ltdc {
> -	status = "okay";
> -
>   	port {
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +
> +		ltdc_ep0_out: endpoint@0 {
> +			reg = <0>;
> +			remote-endpoint = <&sii9022_in>;
> +		};
> +
>   		ltdc_ep1_out: endpoint@1 {
>   			reg = <1>;
>   			remote-endpoint = <&dsi_in>;

[...]

> diff --git a/arch/arm/boot/dts/stm32mp15xx-dhcor-avenger96.dtsi b/arch/arm/boot/dts/stm32mp15xx-dhcor-avenger96.dtsi
> index 64dca5b7f748..e7f10975cacf 100644
> --- a/arch/arm/boot/dts/stm32mp15xx-dhcor-avenger96.dtsi
> +++ b/arch/arm/boot/dts/stm32mp15xx-dhcor-avenger96.dtsi
> @@ -277,11 +277,7 @@
>   	status = "okay";
>   
>   	port {
> -		#address-cells = <1>;
> -		#size-cells = <0>;
> -
> -		ltdc_ep0_out: endpoint@0 {
> -			reg = <0>;
> +		ltdc_ep0_out: endpoint {
>   			remote-endpoint = <&adv7513_in>;
>   		};
>   	};

I think this is wrong, the AV96 can have two displays connected to two 
ports of the LTDC, just like DK2 for example.