linux-kernel - Re: [PATCH v3 4/8] dt-bindings: mmc: arasan: Add optional properties for Arasan SDHCI

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Date:   Thu, 17 Oct 2019 13:22:55 -0500
From:   Rob Herring <robh@...nel.org>
To:     Manish Narani <manish.narani@...inx.com>
Cc:     ulf.hansson@...aro.org, mark.rutland@....com,
        adrian.hunter@...el.com, michal.simek@...inx.com,
        jolly.shah@...inx.com, rajan.vaja@...inx.com,
        nava.manne@...inx.com, mdf@...nel.org, linux-mmc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, git@...inx.com
Subject: Re: [PATCH v3 4/8] dt-bindings: mmc: arasan: Add optional properties
 for Arasan SDHCI

On Thu, Oct 17, 2019 at 11:51:46AM +0530, Manish Narani wrote:
> Add optional propeties for Arasan SDHCI which are used to set clk delays

properties

> for different speed modes in the controller.
> 
> Signed-off-by: Manish Narani <manish.narani@...inx.com>
> ---
>  .../devicetree/bindings/mmc/arasan,sdhci.txt      | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
> index b51e40b2e0c5..e0369dd7fb18 100644
> --- a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
> +++ b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
> @@ -46,6 +46,21 @@ 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.
> +  - clk-phase-legacy: Input/Output Clock Delay pair in degrees for Legacy Mode.
> +  - clk-phase-mmc-hs: Input/Output Clock Delay pair degrees for MMC HS.
> +  - clk-phase-sd-hs: Input/Output Clock Delay pair in degrees for SD HS.
> +  - clk-phase-uhs-sdr12: Input/Output Clock Delay pair in degrees for SDR12.
> +  - clk-phase-uhs-sdr25: Input/Output Clock Delay pair in degrees for SDR25.
> +  - clk-phase-uhs-sdr50: Input/Output Clock Delay pair in degrees for SDR50.
> +  - clk-phase-uhs-sdr104: Input/Output Clock Delay pair in degrees for SDR104.
> +  - clk-phase-uhs-ddr50: Input/Output Clock Delay pair in degrees for SD DDR50.
> +  - clk-phase-mmc-ddr52: Input/Output Clock Delay pair in degrees for MMC DDR52.
> +  - clk-phase-mmc-hs200: Input/Output Clock Delay pair in degrees for MMC HS200.
> +  - clk-phase-mmc-hs400: Input/Output Clock Delay pair in degrees for MMC HS400.

Should be common?

Range of values?

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