linux-kernel - Re: [PATCH v5 1/4] dt-bindings: mmc: Add dll-presets values for HS400 and HS200 modes

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Message-ID: <cb753c72-70ca-44b9-a33c-af2b1c7e69c8@kernel.org>
Date: Tue, 14 Oct 2025 02:06:46 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Ram Prakash Gupta <quic_rampraka@...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>,
 Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konradybcio@...nel.org>
Cc: 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 v5 1/4] dt-bindings: mmc: Add dll-presets values for HS400
 and HS200 modes

On 13/10/2025 16:53, Ram Prakash Gupta wrote:
> From: Sachin Gupta <quic_sachgupt@...cinc.com>
> 
> Document the 'dll-presets' property for MMC device tree bindings.
> The 'dll-presets' 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 594bd174ff21..f7b3b1ced3ce 100644
> --- a/Documentation/devicetree/bindings/mmc/sdhci-msm.yaml
> +++ b/Documentation/devicetree/bindings/mmc/sdhci-msm.yaml
> @@ -138,6 +138,11 @@ properties:
>      $ref: /schemas/types.yaml#/definitions/uint32
>      description: platform specific settings for DLL_CONFIG reg.
>  
> +  qcom,dll-presets:
> +    maxItems: 10
> +    $ref: /schemas/types.yaml#/definitions/uint32-array
> +    description: platform specific settings for DLL registers.

One of my questions, never answered in original submission and in your
versions, was to see the DTS user of it. I still do not see the DTS user.

Best regards,
Krzysztof