Re: [PATCH V4 1/4] ufs: dt-bindings: Document gear and rate limit properties

[Krzysztof Kozlowski]

On 01/09/2025 17:57, Ram Kumar Dwivedi wrote:
> Add optional "limit-hs-gear" and "limit-rate" properties to the
> UFS controller common binding. These properties allow limiting
> the maximum HS gear and rate.
> 
> This is useful in cases where the customer board may have signal
> integrity, clock configuration or layout issues that prevent reliable
> operation at higher gears. Such limitations are especially critical in
> those platforms, where stability is prioritized over peak performance.
> 
> Signed-off-by: Ram Kumar Dwivedi <quic_rdwivedi@xxxxxxxxxxx>
> ---
>  .../devicetree/bindings/ufs/ufs-common.yaml      | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/ufs/ufs-common.yaml b/Documentation/devicetree/bindings/ufs/ufs-common.yaml
> index 31fe7f30ff5b..b4c99fee552f 100644
> --- a/Documentation/devicetree/bindings/ufs/ufs-common.yaml
> +++ b/Documentation/devicetree/bindings/ufs/ufs-common.yaml
> @@ -89,6 +89,22 @@ properties:
>  
>    msi-parent: true
>  
> +  limit-hs-gear:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    minimum: 1
> +    maximum: 5

No improvements.

> +    default: 5
> +    description:
> +      Restricts the maximum HS gear used in both TX and RX directions.
> +
> +  limit-rate:
> +    $ref: /schemas/types.yaml#/definitions/string
> +    enum: [Rate-A, Rate-B]

lowercase

> +    default: Rate-B


Best regards,
Krzysztof