linux-kernel - Re: [PATCH v4 4/8] dt-bindings: mmc: arasan: Add optional properties for Arasan SDHCI

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Date:   Wed, 30 Oct 2019 15:57:29 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Manish Narani <manish.narani@...inx.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Michal Simek <michal.simek@...inx.com>, jolly.shah@...inx.com,
        nava.manne@...inx.com, rajan.vaja@...inx.com,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        git@...inx.com
Subject: Re: [PATCH v4 4/8] dt-bindings: mmc: arasan: Add optional properties
 for Arasan SDHCI

On Tue, 29 Oct 2019 at 11:30, Manish Narani <manish.narani@...inx.com> wrote:
>
> Add optional properties for Arasan SDHCI which are used to set clk delays
> for different speed modes in the controller.
>
> Signed-off-by: Manish Narani <manish.narani@...inx.com>
> ---
>  .../devicetree/bindings/mmc/arasan,sdhci.txt     | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
> index b51e40b2e0c5..c0f505b6cab5 100644
> --- a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
> +++ b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
> @@ -46,6 +46,22 @@ Optional Properties:
>      properly. Test mode can be used to force the controller to function.
>    - xlnx,int-clock-stable-broken: when present, the controller always reports
>      that the internal clock is stable even when it is not.
> +  - arasan-clk-phase-legacy: Input/Output Clock Delay pair in degrees for Legacy Mode.
> +  - arasan-clk-phase-mmc-hs: Input/Output Clock Delay pair degrees for MMC HS.
> +  - arasan-clk-phase-sd-hs: Input/Output Clock Delay pair in degrees for SD HS.
> +  - arasan-clk-phase-uhs-sdr12: Input/Output Clock Delay pair in degrees for SDR12.
> +  - arasan-clk-phase-uhs-sdr25: Input/Output Clock Delay pair in degrees for SDR25.
> +  - arasan-clk-phase-uhs-sdr50: Input/Output Clock Delay pair in degrees for SDR50.
> +  - arasan-clk-phase-uhs-sdr104: Input/Output Clock Delay pair in degrees for SDR104.
> +  - arasan-clk-phase-uhs-ddr50: Input/Output Clock Delay pair in degrees for SD DDR50.
> +  - arasan-clk-phase-mmc-ddr52: Input/Output Clock Delay pair in degrees for MMC DDR52.
> +  - arasan-clk-phase-mmc-hs200: Input/Output Clock Delay pair in degrees for MMC HS200.
> +  - arasan-clk-phase-mmc-hs400: Input/Output Clock Delay pair in degrees for MMC HS400.

I don't mind if you convert these to common mmc bindings.

I think other controllers/platforms may find them useful, at least at
some point, if not already.

> +
> +  Above mentioned are the clock (phase) delays which are to be configured in the
> +  controller while switching to particular speed mode. The range of values are
> +  0 to 359 degrees. If not specified, driver will configure the default value
> +  defined for particular mode in it.
>
>  Example:
>         sdhci@...00000 {
> --
> 2.17.1
>

Kind regards
Uffe