linux-kernel - Re: [PATCH V3 1/4] ufs: dt-bindings: Document gear and rate limit properties

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Message-ID: <1824553d-a038-4ba8-941e-cad64875cb92@acm.org>
Date: Thu, 28 Aug 2025 11:27:25 -0700
From: Bart Van Assche <bvanassche@....org>
To: Krzysztof Kozlowski <krzk@...nel.org>,
 Ram Kumar Dwivedi <quic_rdwivedi@...cinc.com>, alim.akhtar@...sung.com,
 avri.altman@....com, 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 V3 1/4] ufs: dt-bindings: Document gear and rate limit
 properties

On 8/28/25 10:40 AM, Krzysztof Kozlowski wrote:
> On 26/08/2025 17:35, Bart Van Assche wrote:
>>
>>> +  limit-rate:
>>> +    $ref: /schemas/types.yaml#/definitions/uint32
>>> +    enum: [1, 2]
>>> +    default: 2
>>> +    description:
>>> +      Restricts the UFS controller to Rate A (1) or Rate B (2) for both
>>> +      TX and RX directions, often required in automotive environments due
>>> +      to hardware limitations.
>>
>> As far as I know no numeric values are associated with these rates in
>> the UFSHCI 4.1 standard nor in any of the previous versions of this
>> standard. Does the .yaml syntax support something like "enum: [A, B]"?
> 
> That's what I also requested and answer was "1" and "2" are coming from
> the spec. So now I am confused.

Ram quoted from the MIPI spec. That's another standard than what I
referred to (UFSHCI).

Bart.