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Fri, 08 Dec 2023 04:46:59 -0800 (PST) Received: from [192.168.1.20] ([178.197.218.27]) by smtp.gmail.com with ESMTPSA id tj7-20020a170907c24700b00a1c522990ccsm978114ejc.85.2023.12.08.04.46.57 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 08 Dec 2023 04:46:59 -0800 (PST) Message-ID: <29d7c97f-cc98-4f67-9bdc-3005796180c9@linaro.org> Date: Fri, 8 Dec 2023 13:46:57 +0100 Precedence: bulk X-Mailing-List: devicetree@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 13:35, Dmitry Baryshkov wrote: >>>>> 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. > > I always had an impression that #foo-cells means that there are > different units within the major handler. I.e. #clock-cells mean that > there are several different clocks, #reset-cells mean that there are > several resets, etc. > Ok, maybe this is not a perfect description. We need cells to identify > a particular instance within the major block. Maybe that sounds more > correct. No, the cells have also meaning of additional arguments. See usage of phy-type (not the one here, but the correct one) and PWMs. > > For the USB+DP PHY we use #phy-cells to select between USB3 and DP > PHYs. But for these PHYs we do not have sub-devices, sub-blocks, etc. > There is a single PHY which works in either of the modes. Is it different than case here? > > Last, but not least, using #phy-cells in this way would create > asymmetry with all the other PHYs (and especially other QMP PHYs) > present on these platforms. OK. Is phy-type not something different? > > If you feel that phy-type is not an appropriate solution, I'd vote for > not having the type in DT at all, letting the DP controller determine > the proper mode on its own. Can we do it? That's BTW the best option. Best regards, Krzysztof