linux-kernel - Re: [PATCH V3 1/4] dt-bindings: mmc: Add dll-hsr-list for HS400 and HS200 modes

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Message-ID: <64e29442-04eb-cf55-15fd-ea1337d15eb6@quicinc.com>
Date: Thu, 26 Jun 2025 19:54:13 +0530
From: Ram Prakash Gupta <quic_rampraka@...cinc.com>
To: Krzysztof Kozlowski <krzk@...nel.org>,
        Sachin Gupta
	<quic_sachgupt@...cinc.com>,
        Ulf Hansson <ulf.hansson@...aro.org>, "Rob
 Herring" <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        "Conor
 Dooley" <conor+dt@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Bhupesh Sharma <bhupesh.sharma@...aro.org>
CC: <linux-mmc@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <quic_cang@...cinc.com>, <quic_nguyenb@...cinc.com>,
        <quic_bhaskarv@...cinc.com>, <quic_mapa@...cinc.com>,
        <quic_narepall@...cinc.com>, <quic_nitirawa@...cinc.com>,
        <quic_sartgarg@...cinc.com>
Subject: Re: [PATCH V3 1/4] dt-bindings: mmc: Add dll-hsr-list for HS400 and
 HS200 modes


On 6/26/2025 7:46 PM, Ram Prakash Gupta wrote:
> On 1/22/2025 3:56 PM, Krzysztof Kozlowski wrote:
>> On 22/01/2025 10:47, Sachin Gupta wrote:
>>> 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.
>>>
>>> Signed-off-by: Sachin Gupta <quic_sachgupt@...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 8b393e26e025..65dc3053df75 100644
>>> --- a/Documentation/devicetree/bindings/mmc/sdhci-msm.yaml
>>> +++ b/Documentation/devicetree/bindings/mmc/sdhci-msm.yaml
>>> @@ -133,6 +133,11 @@ properties:
>>>      $ref: /schemas/types.yaml#/definitions/uint32
>>>      description: platform specific settings for DLL_CONFIG reg.
>>>  
>>> +  qcom,dll-hsr-list:
>>> +    maxItems: 10
>>> +    $ref: /schemas/types.yaml#/definitions/uint32
>> uint32 has only one item. Anyway, there is already DLL there, so don't
>> duplicate or explain why this is different. Explain also why this is not
>> deducible from the compatible.
> I will change it to reflect array from uint32.
> There is change with artanis DLL hw addition where it need total of 5 entries
> (dll_config, dll_config_2, dll_config_3, dll_usr_ctl, ddr_config)
> for each HS400 and HS200 modes, hence the new addition in dt. And these values
> are not fixed and varies for every SoC, hence this needs to be passed through
> dt like it was passed earlier for qcom,dll-config & qcom,ddr-config.
>
> And backward compatibility would be taken care by check for qcom,dll-hsr-list,
> where new settings would apply for soc where qcom,dll-hsr-list is added into
> dt.
>
>> Please provide here link to DTS user so we can validate how you use it.
>>
>>
>> Best regards,
>> Krzysztof

sure, will provide with V4 patchset.