linux-kernel - Re: [PATCH V9 1/3] dt-bindings: mmc: tegra: Add supports-cqe property

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Date:   Mon, 21 Jan 2019 11:43:33 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Sowjanya Komatineni <skomatineni@...dia.com>,
        Rob Herring <robh+dt@...nel.org>
Cc:     robh+dt@...nel.org, mark.rutland@....com, mperttunen@...dia.com,
        chunyan.zhang@...soc.com, jonathanh@...dia.com,
        adrian.hunter@...el.com, ulf.hansson@...aro.org, anrao@...dia.com,
        devicetree@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org
Subject: Re: [PATCH V9 1/3] dt-bindings: mmc: tegra: Add supports-cqe property

On Tue, Jan 15, 2019 at 11:03:50AM -0800, Sowjanya Komatineni wrote:
> Add supports-cqe optional property for Tegra SDMMC.
> 
> Tegra186 and Tegra194 supports HW Command queue only
> on SDMMC4 controller. This property is used to identify
> command queue support controller in the tegra sdhci driver.
> 
> Signed-off-by: Sowjanya Komatineni <skomatineni@...dia.com>
> ---
>  Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt b/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt
> index 32b4b4e41923..fb14c2c8d7ee 100644
> --- a/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt
> +++ b/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt
> @@ -72,6 +72,10 @@ Optional properties for Tegra210 and Tegra186:
>  - nvidia,default-trim : Specify the default outbound clock trimmer
>    value.
>  - nvidia,dqs-trim : Specify DQS trim value for HS400 timing
> +- supports-cqe : The presence of this property indicates that the
> +  corresponding controller supports HW command queue feature.
> +  Tegra186 and Tegra194 has 4 SDMMC Controllers and only SDMMC4
> +  controller supports HW Command Queue with eMMC device.

Hi Rob,

are you okay with the property name for this. I'm wondering if it should
have a vendor prefix or not, but I suspect that something like this may
be needed for other vendors as well, so not having a vendor prefix could
be warranted in this case.

Thierry

>  
>    Notes on the pad calibration pull up and pulldown offset values:
>      - The property values are drive codes which are programmed into the
> -- 
> 2.7.4
> 

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