linux-kernel - Re: [PATCH 2/2] arm64: dts: exynos: Remove unneeded DSI and DECON address/size cells in Exynos5433

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Date:   Tue, 19 Jun 2018 09:25:59 +0200
From:   Andrzej Hajda <a.hajda@...sung.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Kukjin Kim <kgene@...nel.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] arm64: dts: exynos: Remove unneeded DSI and DECON
 address/size cells in Exynos5433

On 18.06.2018 19:42, Krzysztof Kozlowski wrote:
> The decon, decon_tv and dsi nodes have only one child port so
> address/size mappings are not necessary.  This fixes DTC warnings like:
>
>     Warning (graph_child_address): /soc/decon@...00000/ports:
>         graph node has single child node 'port@0', #address-cells/#size-cells are not necessary

DECON nodes according to documentation have only one port so it is OK.
DSI has two ports, but since on all Exynos platforms DSI panels/bridges
are subnodes of ExynosDSI the 2nd port is not used.
So if there will be a platform with DSI panel/bridge controlled via I2C,
it should be reverted., but this is theoretical problem.



>
> Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>

Reviewed-by: Andrzej Hajda <a.hajda@...sung.com>

 --
Regards
Andrzej


> ---
>  arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi |  6 +-----
>  arch/arm64/boot/dts/exynos/exynos5433.dtsi            | 12 ++----------
>  2 files changed, 3 insertions(+), 15 deletions(-)
>
> diff --git a/arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi b/arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi
> index a1e3194b7483..0a15ee513f5c 100644
> --- a/arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi
> +++ b/arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi
> @@ -321,11 +321,7 @@
>  	status = "okay";
>  
>  	ports {
> -		#address-cells = <1>;
> -		#size-cells = <0>;
> -
> -		port@0 {
> -			reg = <0>;
> +		port {
>  			tv_to_hdmi: endpoint {
>  				remote-endpoint = <&hdmi_to_tv>;
>  			};
> diff --git a/arch/arm64/boot/dts/exynos/exynos5433.dtsi b/arch/arm64/boot/dts/exynos/exynos5433.dtsi
> index 3a9b4c4b9c63..e4367fd39120 100644
> --- a/arch/arm64/boot/dts/exynos/exynos5433.dtsi
> +++ b/arch/arm64/boot/dts/exynos/exynos5433.dtsi
> @@ -850,11 +850,7 @@
>  			iommu-names = "m0", "m1";
>  
>  			ports {
> -				#address-cells = <1>;
> -				#size-cells = <0>;
> -
> -				port@0 {
> -					reg = <0>;
> +				port {
>  					decon_to_mic: endpoint {
>  						remote-endpoint =
>  							<&mic_to_decon>;
> @@ -914,11 +910,7 @@
>  			#size-cells = <0>;
>  
>  			ports {
> -				#address-cells = <1>;
> -				#size-cells = <0>;
> -
> -				port@0 {
> -					reg = <0>;
> +				port {
>  					dsi_to_mic: endpoint {
>  						remote-endpoint = <&mic_to_dsi>;
>  					};