linux-kernel - Re: [PATCH V1 1/3] dt-bindings: ufs: qcom: Add reg and reg-names

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Message-ID: <466a42c4-54f5-45b2-b7f0-2d51695eac8e@kernel.org>
Date: Wed, 30 Jul 2025 11:11:00 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Ram Kumar Dwivedi <quic_rdwivedi@...cinc.com>, mani@...nel.org,
 alim.akhtar@...sung.com, avri.altman@....com, bvanassche@....org,
 robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
 andersson@...nel.org, konradybcio@...nel.org, agross@...nel.org
Cc: linux-arm-msm@...r.kernel.org, linux-scsi@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V1 1/3] dt-bindings: ufs: qcom: Add reg and reg-names

On 30/07/2025 10:22, Ram Kumar Dwivedi wrote:
> Update the Qualcomm UFS device tree bindings to support Multi-Circular
> Queue (MCQ) operation. This includes increasing the maximum number of
> register entries from 2 to 3 and extending the accepted values for
> reg-names to include "mcq_sqd" and "mcq_vs".
> 
> These changes are required to enable MCQ support via Device Tree for
> platforms such as SM8650 and SM8750.
> 
> Signed-off-by: Ram Kumar Dwivedi <quic_rdwivedi@...cinc.com>
> ---
>  .../devicetree/bindings/ufs/qcom,ufs.yaml     | 21 ++++++++++++-------
>  1 file changed, 13 insertions(+), 8 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/ufs/qcom,ufs.yaml b/Documentation/devicetree/bindings/ufs/qcom,ufs.yaml
> index 6c6043d9809e..de263118b552 100644
> --- a/Documentation/devicetree/bindings/ufs/qcom,ufs.yaml
> +++ b/Documentation/devicetree/bindings/ufs/qcom,ufs.yaml
> @@ -86,12 +86,17 @@ properties:
>  
>    reg:
>      minItems: 1
> -    maxItems: 2
> +    maxItems: 3
>  
>    reg-names:
> -    items:
> -      - const: std
> -      - const: ice
> +    oneOf:
> +      - items:
> +          - const: std
> +          - const: ice
> +      - items:
> +          - const: ufs_mem
> +          - const: mcq_sqd
> +          - const: mcq_vs

This is incompatible change and commit msg is inaccurate here. It says
"extending" but you are not extending at all.

Recent qcom patches love to break ABI and impact users. No.

Best regards,
Krzysztof