linux-kernel - Re: [PATCH 5/9] dt-bindings: mmc: mmci: add delay block base register for sdmmc

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Date:   Wed, 15 Jan 2020 08:56:45 -0600
From:   Rob Herring <robh@...nel.org>
To:     Ludovic Barre <ludovic.barre@...com>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        srinivas.kandagatla@...aro.org,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-mmc@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com
Subject: Re: [PATCH 5/9] dt-bindings: mmc: mmci: add delay block base
 register for sdmmc

On Fri, Jan 10, 2020 at 02:48:19PM +0100, Ludovic Barre wrote:
> To support the sdr104 mode, the sdmmc variant has a
> hardware delay block to manage the clock phase when sampling
> data received by the card.
> 
> This patch adds a second base register (optional) for
> sdmmc delay block.
> 
> Signed-off-by: Ludovic Barre <ludovic.barre@...com>
> ---
>  Documentation/devicetree/bindings/mmc/mmci.txt | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/mmc/mmci.txt b/Documentation/devicetree/bindings/mmc/mmci.txt
> index 6d3c626e017d..4ec921e4bf34 100644
> --- a/Documentation/devicetree/bindings/mmc/mmci.txt
> +++ b/Documentation/devicetree/bindings/mmc/mmci.txt
> @@ -28,6 +28,8 @@ specific for ux500 variant:
>  - st,sig-pin-fbclk       : feedback clock signal pin used.
>  
>  specific for sdmmc variant:
> +- reg			 : a second base register may be defined if a delay
> +                           block is present and used for tuning.

Which compatibles have a 2nd reg entry?

>  - st,sig-dir             : signal direction polarity used for cmd, dat0 dat123.
>  - st,neg-edge            : data & command phase relation, generated on
>                             sd clock falling edge.
> -- 
> 2.17.1
>