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

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Message-ID: <5cbfa653-03c3-41dd-a309-406eaf3b6033@kernel.org>
Date: Tue, 2 Sep 2025 08:12:03 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Ram Kumar Dwivedi <quic_rdwivedi@...cinc.com>, alim.akhtar@...sung.com,
 avri.altman@....com, bvanassche@....org, robh@...nel.org,
 krzk+dt@...nel.org, conor+dt@...nel.org, mani@...nel.org,
 James.Bottomley@...senPartnership.com, martin.petersen@...cle.com
Cc: linux-scsi@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH V4 1/4] ufs: dt-bindings: Document gear and rate limit
 properties

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@...cinc.com>
> ---
>  .../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