linux-kernel - Re: [PATCH v3 3/6] dt-bindings: phy-qcom-qmp: Update bindings for sdm845

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Date:   Wed, 28 Mar 2018 12:56:21 +0530
From:   Manu Gautam <mgautam@...eaurora.org>
To:     Doug Anderson <dianders@...omium.org>,
        Rob Herring <robh+dt@...nel.org>
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        LKML <linux-kernel@...r.kernel.org>, devicetree@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, Mark Rutland <mark.rutland@....com>,
        Vivek Gautam <vivek.gautam@...eaurora.org>,
        Varadarajan Narayanan <varada@...eaurora.org>
Subject: Re: [PATCH v3 3/6] dt-bindings: phy-qcom-qmp: Update bindings for
 sdm845

Hi,


On 3/28/2018 3:07 AM, Doug Anderson wrote:
> Hi,
>
> On Thu, Mar 22, 2018 at 11:11 PM, Manu Gautam <mgautam@...eaurora.org> wrote:
>> Update compatible strings for USB3 PHYs on SDM845.
>> One is QMPv3 DisplayPort-USB combo PHY and other one
>> is USB UNI PHY which is single lane USB3 PHY without
>> DP capability.
>>
>> Reviewed-by: Rob Herring <robh@...nel.org>
>> Signed-off-by: Manu Gautam <mgautam@...eaurora.org>
>> ---
>>  Documentation/devicetree/bindings/phy/qcom-qmp-phy.txt | 4 +++-
>>  1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/devicetree/bindings/phy/qcom-qmp-phy.txt b/Documentation/devicetree/bindings/phy/qcom-qmp-phy.txt
>> index dcf1b8f..cef8765 100644
>> --- a/Documentation/devicetree/bindings/phy/qcom-qmp-phy.txt
>> +++ b/Documentation/devicetree/bindings/phy/qcom-qmp-phy.txt
>> @@ -9,7 +9,9 @@ Required properties:
>>                "qcom,ipq8074-qmp-pcie-phy" for PCIe phy on IPQ8074
>>                "qcom,msm8996-qmp-pcie-phy" for 14nm PCIe phy on msm8996,
>>                "qcom,msm8996-qmp-usb3-phy" for 14nm USB3 phy on msm8996,
>> -              "qcom,qmp-v3-usb3-phy" for USB3 QMP V3 phy.
>> +              "qcom,qmp-v3-usb3-phy" for USB3 QMP V3 phy,
>> +              "qcom,sdm845-qmp-usb3-phy" for USB3 QMP V3 phy on sdm845,
>> +              "qcom,sdm845-qmp-usb3-uni-phy" for USB3 QMP V3 UNI phy on sdm845.
> I'm confused.  What value does "qcom,qmp-v3-usb3-phy" have as a
> separate entry from "qcom,sdm845-qmp-usb3-phy"?  Is
> "qcom,qmp-v3-usb3-phy" expected to work on some non-SDM845 based
> device?
>
> Personally I think you should remove "qcom,qmp-v3-usb3-phy" from the
> bindings as part of this patch (replacing it with the new string
> qcom,sdm845-qmp-usb3-phy)".  Yeah, yeah bindings are forever.  ...but
> that particular string was added about a month ago and (I believe) it
> was intended for SDM845 anyway.  As per
> <https://patchwork.kernel.org/patch/10302759/> match to the exact same
> PHY data which leads extra credence to my belief.
>
> If later on you find that some future chip can use the exact same
> driver / settings as the SDM845 you can always list the
> "qcom,sdm845-qmp-usb3-phy" string as a secondary compatible anyway.
>

I agree. Will just remove "qcom,sdm845-qmp-usb3-phy"

> -Doug

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