linux-kernel - Re: [PATCH 5/8] arm64: dts: tegra186: Add SDMMC4 DQS trim value

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Message-ID: <20180809114922.GN21639@ulmo>
Date:   Thu, 9 Aug 2018 13:49:22 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Aapo Vienamo <avienamo@...dia.com>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Mikko Perttunen <mperttunen@...dia.com>,
        linux-mmc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/8] arm64: dts: tegra186: Add SDMMC4 DQS trim value

On Tue, Aug 07, 2018 at 05:00:01PM +0300, Aapo Vienamo wrote:
> Add the HS400 DQS trim value for Tegra186 SDMMC4.
> 
> Signed-off-by: Aapo Vienamo <avienamo@...dia.com>
> ---
>  arch/arm64/boot/dts/nvidia/tegra186.dtsi | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm64/boot/dts/nvidia/tegra186.dtsi b/arch/arm64/boot/dts/nvidia/tegra186.dtsi
> index 6e9ef26..9e07bc6 100644
> --- a/arch/arm64/boot/dts/nvidia/tegra186.dtsi
> +++ b/arch/arm64/boot/dts/nvidia/tegra186.dtsi
> @@ -313,6 +313,7 @@
>  		nvidia,pad-autocal-pull-down-offset-1v8-timeout = <0x0a>;
>  		nvidia,default-tap = <0x5>;
>  		nvidia,default-trim = <0x9>;
> +		nvidia,dqs-trim = <63>;
>  		status = "disabled";
>  	};
>  

Isn't this technically dependent on the board layout and as such would
belong in the board DTS file? Or does this value work on all existing
Tegra186 platforms?

Thierry

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