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

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Message-Id: <20180619072652eucas1p1943deb1b158eda52980448e41f83e5e9~5fwX6lI2o2633926339eucas1p1Q@eucas1p1.samsung.com>
Date:   Tue, 19 Jun 2018 09:26:50 +0200
From:   Marek Szyprowski <m.szyprowski@...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>, 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

Hi Krzysztof,

On 2018-06-18 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
>
> Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>

Works fine with current Exynos DRM Decon/MIC/DSI drivers.

Tested-by: Marek Szyprowski <m.szyprowski@...sung.com>

> ---
>   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>;
>   					};

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland