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

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Date:   Mon, 25 Apr 2022 11:49:02 +0530
From:   Aswath Govindraju <a-govindraju@...com>
To:     Ulf Hansson <ulf.hansson@...aro.org>
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

Hi Uffe,

On 21/04/22 17:40, Ulf Hansson wrote:
> 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.
> 

Sure, will rephrase it in the respin to remove the aspects that indicate
the sw support added.

> Otherwise, this looks good to me.
> 

Thank you for the review.

Regards,
Aswath

> 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
>>