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Message-ID: <d885928d-035b-4abd-890b-c9626b925d76@linaro.org>
Date:   Fri, 8 Dec 2023 13:20:58 +0100
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Subject: Re: [PATCH v3 2/3] dt-bindings: phy: qcom-edp: Add X1E80100 PHY
 compatibles
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To:     Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Cc:     Konrad Dybcio <konrad.dybcio@linaro.org>,
        Abel Vesa <abel.vesa@linaro.org>,
        Andy Gross <agross@kernel.org>,
        Bjorn Andersson <andersson@kernel.org>,
        Vinod Koul <vkoul@kernel.org>,
        Kishon Vijay Abraham I <kishon@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>,
        Abhinav Kumar <quic_abhinavk@quicinc.com>,
        Johan Hovold <johan@kernel.org>, linux-arm-msm@vger.kernel.org,
        linux-phy@lists.infradead.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org
References: <20231122-phy-qualcomm-edp-x1e80100-v3-0-576fc4e9559d@linaro.org>
 <20231122-phy-qualcomm-edp-x1e80100-v3-2-576fc4e9559d@linaro.org>
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 <545d3ace-66e5-4470-b3a4-cbdac5ae473d@linaro.org>
 <ab7223a2-9f3f-4c9c-ab97-31512e7a0123@linaro.org>
 <CAA8EJpoboN85bLiayXJgn5iwh+Gn0OtK0aZ26ZJu9H3xkTT2Tw@mail.gmail.com>
 <d9d27fa4-6ede-4958-b717-db425be61068@linaro.org>
 <CAA8EJpq7dB+45fiq2WmkMmSO7KszY0Et_t1gZ9ZvfsSxftpm8g@mail.gmail.com>
From:   Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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On 08/12/2023 13:17, Dmitry Baryshkov wrote:
>>>>>> Anyway, I was thinking this should be rather argument to phy-cells.
>>>>> I'm not sure I'm for this, because the results would be:
>>>>>
>>>>> --- device.dts ---
>>>>> &dp_controller0 {
>>>>>      phys = <&dp_phy0 PHY_EDP>;
>>>>> };
>>>>>
>>>>> &dp_controller1 {
>>>>>      phys = <&dp_phy1 PHY_DP>;
>>>>> };
>>>>> ------------------
>>>>>
>>>>> as opposed to:
>>>>>
>>>>> --- device.dts ---
>>>>> &dp_phy0 {
>>>>>      phy-type <PHY_EDP>;
>>>>> };
>>>>>
>>>>> &dp_phy1 {
>>>>>      phy-type = <PHY_DP>;
>>>>> };
>>>>> ------------------
>>>>
>>>> Which is exactly what I proposed/wanted to see.
>>>>
>>>>>
>>>>> i.e., we would be saying "this board is connected to this phy
>>>>> instead" vs "this phy is of this type on this board".
>>>>>
>>>>> While none of them really fit the "same hw, different config"
>>>>> situation, I'd vote for the latter one being closer to the
>>>>> truth
>>>>
>>>> Then maybe I miss the bigger picture, but commit msg clearly says:
>>>> "multiple PHYs that can work in both eDP or DP mode"
>>>>
>>>> If this is not the case, describe the hardware correctly in the commit
>>>> msg, so people will not ask stupid questions...
>>>
>>> There are multiple PHYs (each of them at its own address space). Each
>>> of the PHYs in question can be used either for the DisplayPort output
>>> (directly or through the USB-C) or to drive the eDP panel.
>>>
>>> Same applies to the displayport-controller. It can either drive the DP
>>> or eDP output, hardware-wise it is the same.
>>
>> Therefore what I proposed was correct - the block which uses the phy
>> configures its mode. Because this part:
>>   "this phy is of this type on this board".
>> is not true. The phy is both types.
> 
> But hopefully you don't mean using #phy-cells here. There are no
> sub-PHYs or anything like that.

I am exactly talking about phy-cells. Look at first example from Abel's
code.

Best regards,
Krzysztof