linux-kernel - Re: [PATCH v4 1/4] dt-bindings: mmc: Add dll-hsr-list for HS400 and HS200 modes

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Message-ID: <817f02aa-dfb8-a134-2fd4-fbdf8e8a714e@quicinc.com>
Date: Tue, 7 Oct 2025 16:46:52 +0530
From: Ram Prakash Gupta <quic_rampraka@...cinc.com>
To: Rob Herring <robh@...nel.org>
CC: Ulf Hansson <ulf.hansson@...aro.org>,
        Krzysztof Kozlowski
	<krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Adrian Hunter
	<adrian.hunter@...el.com>,
        Bjorn Andersson <andersson@...nel.org>,
        "Konrad
 Dybcio" <konradybcio@...nel.org>, <linux-mmc@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>, <dmitry.baryshkov@....qualcomm.com>,
        <quic_pragalla@...cinc.com>, <quic_sayalil@...cinc.com>,
        <quic_nitirawa@...cinc.com>, <quic_bhaskarv@...cinc.com>,
        <kernel@....qualcomm.com>, Sachin Gupta <quic_sachgupt@...cinc.com>
Subject: Re: [PATCH v4 1/4] dt-bindings: mmc: Add dll-hsr-list for HS400 and
 HS200 modes


On 10/7/2025 3:18 AM, Rob Herring wrote:
> On Mon, Sep 29, 2025 at 05:05:12PM +0530, Ram Prakash Gupta wrote:
>> From: Sachin Gupta <quic_sachgupt@...cinc.com>
>>
>> Document the 'dll-hsr-list' property for MMC device tree bindings.
>> The 'dll-hsr-list' property defines the DLL configurations for HS400
>> and HS200 modes.
>>
>> QC SoCs can have 0 to 4 SDHCI instances, and each one may need
>> different tuning.
>>
>> Signed-off-by: Sachin Gupta <quic_sachgupt@...cinc.com>
>> Signed-off-by: Ram Prakash Gupta <quic_rampraka@...cinc.com>
>> ---
>>  Documentation/devicetree/bindings/mmc/sdhci-msm.yaml | 5 +++++
>>  1 file changed, 5 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/mmc/sdhci-msm.yaml b/Documentation/devicetree/bindings/mmc/sdhci-msm.yaml
>> index 22d1f50c3fd1..a60222473990 100644
>> --- a/Documentation/devicetree/bindings/mmc/sdhci-msm.yaml
>> +++ b/Documentation/devicetree/bindings/mmc/sdhci-msm.yaml
>> @@ -137,6 +137,11 @@ properties:
>>      $ref: /schemas/types.yaml#/definitions/uint32
>>      description: platform specific settings for DLL_CONFIG reg.
>>  
>> +  qcom,dll-hsr-list:
> '-list' doesn't add anything.

list was used as there are 5 dll register, but '-list' can be
dropped, and it can be renamed to qcom,dll-hsr, I will update in
next patchset.

>
> What is 'hsr'?

Hardware Settings Reference

>
>> +    maxItems: 10
>> +    $ref: /schemas/types.yaml#/definitions/uint32-array
>> +    description: platform specific settings for DLL registers.
>> +
>>    iommus:
>>      minItems: 1
>>      maxItems: 8
>> -- 
>> 2.34.1
>>