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Fri, 08 Dec 2023 04:21:00 -0800 (PST) Received: from [192.168.1.20] ([178.197.218.27]) by smtp.gmail.com with ESMTPSA id he43-20020a1709073dab00b00a1e21893a26sm936349ejc.222.2023.12.08.04.20.58 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 08 Dec 2023 04:20:59 -0800 (PST) Message-ID: Date: Fri, 8 Dec 2023 13:20:58 +0100 Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 2/3] dt-bindings: phy: qcom-edp: Add X1E80100 PHY compatibles Content-Language: en-US To: Dmitry Baryshkov Cc: Konrad Dybcio , Abel Vesa , Andy Gross , Bjorn Andersson , Vinod Koul , Kishon Vijay Abraham I , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Abhinav Kumar , Johan Hovold , 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> <545d3ace-66e5-4470-b3a4-cbdac5ae473d@linaro.org> From: Krzysztof Kozlowski Autocrypt: addr=krzysztof.kozlowski@linaro.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit 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 ; >>>>> }; >>>>> >>>>> &dp_phy1 { >>>>> phy-type = ; >>>>> }; >>>>> ------------------ >>>> >>>> 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