linux-kernel - Re: [PATCH 1/2] dt-bindings: mmc: sdhci-am654: Add flag to force setting to TESTCD bit

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Date:   Thu, 21 Apr 2022 14:10:27 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Aswath Govindraju <a-govindraju@...com>
Cc:     Vignesh Raghavendra <vigneshr@...com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-mmc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: mmc: sdhci-am654: Add flag to force
 setting to TESTCD bit

On Mon, 18 Apr 2022 at 12:21, Aswath Govindraju <a-govindraju@...com> wrote:
>
> The ARASAN MMC controller on Keystone 3 class of devices needs the SDCD
> line to be connected for proper functioning. Similar to the issue pointed
> out in sdhci-of-arasan.c driver, commit 3794c542641f ("mmc:
> sdhci-of-arasan: Set controller to test mode when no CD bit").
>
> In cases where SDCD line is not connected, driver support has been added to
> force the controller into test mode and set the TESTCD bit. In order to
> implement this quirk the driver uses "ti,fails-without-test-cd" flag from
> the device tree node. Therefore, update the bindings to document the above.

Would you mind rephrasing this a bit. DT bindings is about describing
the HW, not about what the software should do.

Otherwise, this looks good to me.

Kind regards
Uffe

>
> Signed-off-by: Aswath Govindraju <a-govindraju@...com>
> ---
>  Documentation/devicetree/bindings/mmc/sdhci-am654.yaml | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/mmc/sdhci-am654.yaml b/Documentation/devicetree/bindings/mmc/sdhci-am654.yaml
> index 0566493c4def..0ab07759b472 100644
> --- a/Documentation/devicetree/bindings/mmc/sdhci-am654.yaml
> +++ b/Documentation/devicetree/bindings/mmc/sdhci-am654.yaml
> @@ -186,6 +186,13 @@ properties:
>      description: Clock Delay Buffer Select
>      $ref: "/schemas/types.yaml#/definitions/uint32"
>
> +  ti,fails-without-test-cd:
> +    $ref: /schemas/types.yaml#/definitions/flag
> +    description:
> +      When present, indicates that the CD line is not connected
> +      and the controller is required to be forced into Test mode
> +      to set the TESTCD bit.
> +
>  required:
>    - compatible
>    - reg
> --
> 2.17.1
>