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: <88220541-e344-443d-353c-be738437254e@quicinc.com>
Date: Mon, 13 Oct 2025 18:34:42 +0530
From: Ram Prakash Gupta <quic_rampraka@...cinc.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
        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 5:12 PM, Konrad Dybcio wrote:
> On 10/7/25 1:16 PM, Ram Prakash Gupta wrote:
>> 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
> Maybe "qcom,dll-presets" would be more clear?
>
> Konrad

sure, sounds good.