linux-kernel - Re: [PATCH V1 0/3] Add DT-based gear and rate limiting support

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Message-ID: <tc57sqskjmjloocxzvhay2i5q6xdjjsaia566tmi2yknp5kwx5@3ae2gm3mgzgg>
Date: Wed, 23 Jul 2025 20:11:03 +0530
From: Manivannan Sadhasivam <mani@...nel.org>
To: Ram Kumar Dwivedi <quic_rdwivedi@...cinc.com>
Cc: 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, James.Bottomley@...senpartnership.com, 
	martin.petersen@...cle.com, agross@...nel.org, linux-arm-msm@...r.kernel.org, 
	linux-scsi@...r.kernel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V1 0/3] Add DT-based gear and rate limiting support

On Tue, Jul 22, 2025 at 09:41:00PM GMT, Ram Kumar Dwivedi wrote:
> This patch series adds support for limiting the maximum high-speed
> gear and rate used by the UFS controller on Qualcomm platforms via
> device tree.
> 
> Some automotive platforms, such as SA8155, require restricting the
> maximum gear or rate due to hardware limitations. To support this,

What do you mean by 'hardware limitation'? Please explain.

- Mani

> the driver is extended to parse two new optional DT properties and
> apply them during initialization. The default behavior remains
> unchanged if these properties are not specified.
> 
> Ram Kumar Dwivedi (3):
>   scsi: ufs: qcom: Add support for DT-based gear and rate limiting
>   arm64: dts: qcom: sa8155: Add gear and rate limit properties to UFS
>   dt-bindings: ufs: qcom: Document HS gear and rate limit properties
> 
>  .../devicetree/bindings/ufs/qcom,ufs.yaml     | 10 +++++++
>  arch/arm64/boot/dts/qcom/sm8150.dtsi          |  3 ++
>  drivers/ufs/host/ufs-qcom.c                   | 29 +++++++++++++++----
>  3 files changed, 36 insertions(+), 6 deletions(-)
> 
> -- 
> 2.50.1
> 

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