linux-kernel - Re: [PATCH v2 06/15] dt-bindings: ufs: Add "max-device-gear" property for UFS device

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Message-ID: <1fe8fd96-7770-0bda-c970-aa38d030ff3b@linaro.org>
Date:   Wed, 2 Nov 2022 15:09:50 -0400
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        martin.petersen@...cle.com, jejb@...ux.ibm.com,
        andersson@...nel.org, vkoul@...nel.org,
        krzysztof.kozlowski+dt@...aro.org
Cc:     konrad.dybcio@...ainline.org, robh+dt@...nel.org,
        quic_cang@...cinc.com, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-phy@...ts.infradead.org, linux-scsi@...r.kernel.org,
        dmitry.baryshkov@...aro.org, ahalaney@...hat.com
Subject: Re: [PATCH v2 06/15] dt-bindings: ufs: Add "max-device-gear" property
 for UFS device

On 31/10/2022 14:02, Manivannan Sadhasivam wrote:
> The maximum gear supported by the UFS device can be specified using the
> "max-device-gear" property. This allows the UFS controller to configure the
> TX/RX gear before starting communication with the UFS device.

This is confusing. The UFS PHY provides gear capability, so what is the
"device" here? The attached memory? How could it report something else
than phy?

The last sentence also suggests that you statically encode gear to avoid
runtime negotiation.

Best regards,
Krzysztof