linux-kernel - Re: [PATCH] ARM: dts: exynos: Add the OF graph between fimd and dsi

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Message-ID: <20170609072754.GB4018@kozik-book>
Date:   Fri, 9 Jun 2017 09:27:54 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Hoegeun Kwon <hoegeun.kwon@...sung.com>
Cc:     inki.dae@...sung.com, jy0922.shim@...sung.com,
        sw0312.kim@...sung.com, airlied@...ux.ie, kgene@...nel.org,
        robh+dt@...nel.org, mark.rutland@....com, catalin.marinas@....com,
        will.deacon@....com, javier@....samsung.com,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, a.hajda@...sung.com
Subject: Re: [PATCH] ARM: dts: exynos: Add the OF graph between fimd and dsi

On Fri, Jun 09, 2017 at 11:59:33AM +0900, Hoegeun Kwon wrote:
> It should be connected to OF graph between fimd and dsi.
> Add the OF graph between fimd and dsi.

I need more explanation why this is needed. What happens without this?
What issue is fixed here?

What about Exynos5250 and Exynos5420? I think we do not have a board in
mainline using FIMD but maybe this should be added just for correct
hardware description?


Best regards,
Krzysztof

> 
> Signed-off-by: Hoegeun Kwon <hoegeun.kwon@...sung.com>
> ---
>  arch/arm/boot/dts/exynos3250.dtsi | 26 ++++++++++++++++++++++++++
>  arch/arm/boot/dts/exynos4.dtsi    | 26 ++++++++++++++++++++++++++
>  2 files changed, 52 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/exynos3250.dtsi b/arch/arm/boot/dts/exynos3250.dtsi
> index 590ee44..22d523f 100644
> --- a/arch/arm/boot/dts/exynos3250.dtsi
> +++ b/arch/arm/boot/dts/exynos3250.dtsi
> @@ -311,6 +311,19 @@
>  			iommus = <&sysmmu_fimd0>;
>  			samsung,sysreg = <&sys_reg>;
>  			status = "disabled";
> +
> +			ports {
> +				#address-cells = <1>;
> +				#size-cells = <0>;
> +
> +				port@0 {
> +					reg = <0>;
> +					fimd_to_dsi: endpoint {
> +						remote-endpoint =
> +							<&dsi_to_fimd>;
> +					};
> +				};
> +			};
>  		};
>  
>  		dsi_0: dsi@...80000 {
> @@ -326,6 +339,19 @@
>  			#address-cells = <1>;
>  			#size-cells = <0>;
>  			status = "disabled";
> +
> +			ports {
> +				#address-cells = <1>;
> +				#size-cells = <0>;
> +
> +				port@0 {
> +					reg = <0>;
> +					dsi_to_fimd: endpoint {
> +						remote-endpoint =
> +							<&fimd_to_dsi>;
> +					};
> +				};
> +			};
>  		};
>  
>  		sysmmu_fimd0: sysmmu@...20000 {
> diff --git a/arch/arm/boot/dts/exynos4.dtsi b/arch/arm/boot/dts/exynos4.dtsi
> index 497a947..773d392 100644
> --- a/arch/arm/boot/dts/exynos4.dtsi
> +++ b/arch/arm/boot/dts/exynos4.dtsi
> @@ -193,6 +193,19 @@
>  		status = "disabled";
>  		#address-cells = <1>;
>  		#size-cells = <0>;
> +
> +		ports {
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +
> +			port@0 {
> +				reg = <0>;
> +				dsi_to_fimd: endpoint {
> +					remote-endpoint =
> +						<&fimd_to_dsi>;
> +				};
> +			};
> +		};
>  	};
>  
>  	camera {
> @@ -715,6 +728,19 @@
>  		iommus = <&sysmmu_fimd0>;
>  		samsung,sysreg = <&sys_reg>;
>  		status = "disabled";
> +
> +		ports {
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +
> +			port@0 {
> +				reg = <0>;
> +				fimd_to_dsi: endpoint {
> +					remote-endpoint =
> +						<&dsi_to_fimd>;
> +				};
> +			};
> +		};
>  	};
>  
>  	tmu: tmu@...C0000 {
> -- 
> 1.9.1
>