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Fri, 01 Dec 2023 00:01:47 -0800 (PST) Received: from [192.168.1.20] ([178.197.223.109]) by smtp.gmail.com with ESMTPSA id f15-20020a05600c4e8f00b0040b3632e993sm8204509wmq.46.2023.12.01.00.01.44 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 01 Dec 2023 00:01:46 -0800 (PST) Message-ID: <166d307e-7d1b-48b5-90db-9b6df01d87c2@linaro.org> Date: Fri, 1 Dec 2023 09:01:43 +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 1/3] dt-bindings: phy: qcom,qmp: Add PCIe qcom,refclk-always-on property To: Manivannan Sadhasivam , Krishna Chaitanya Chundru Cc: Andy Gross , Bjorn Andersson , Konrad Dybcio , Vinod Koul , Kishon Vijay Abraham I , Rob Herring , Krzysztof Kozlowski , Conor Dooley , linux-arm-msm@vger.kernel.org, linux-phy@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, quic_vbadigan@quicinc.com, quic_ramkri@quicinc.com, quic_nitegupt@quicinc.com, quic_skananth@quicinc.com, quic_vpernami@quicinc.com, quic_parass@quicinc.com References: <20231127-refclk_always_on-v3-0-26d969fa8f1d@quicinc.com> <20231127-refclk_always_on-v3-1-26d969fa8f1d@quicinc.com> <78815f1b-7390-40de-8afd-ac71806f4051@linaro.org> <24fae40a-453b-b14c-923f-88758a246aa7@quicinc.com> <20231201060716.GJ4009@thinkpad> Content-Language: en-US From: Krzysztof Kozlowski Autocrypt: addr=krzysztof.kozlowski@linaro.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 01/12/2023 07:07, Manivannan Sadhasivam wrote: > On Tue, Nov 28, 2023 at 02:49:18PM +0530, Krishna Chaitanya Chundru wrote: >> >> On 11/28/2023 2:26 PM, Krzysztof Kozlowski wrote: >>> On 27/11/2023 13:13, Krishna chaitanya chundru wrote: >>>> Document qcom,refclk-always-on property which is needed in some platforms >>>> to supply refclk even in PCIe low power states. >>>> >>>> Signed-off-by: Krishna chaitanya chundru >>>> --- >>>> .../devicetree/bindings/phy/qcom,sc8280xp-qmp-pcie-phy.yaml | 7 +++++++ >>>> 1 file changed, 7 insertions(+) >>>> >>>> diff --git a/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-pcie-phy.yaml b/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-pcie-phy.yaml >>>> index 2c3d6553a7ba..c747c9f35795 100644 >>>> --- a/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-pcie-phy.yaml >>>> +++ b/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-pcie-phy.yaml >>>> @@ -93,6 +93,13 @@ properties: >>>> "#phy-cells": >>>> const: 0 >>>> + qcom,refclk-always-on: >>>> + type: boolean >>>> + description: In some platform where PCIe switch is connected, pcie switch due to some design >>> You received a comment to use proper wrapping: 80. Please implement it. >> I will update this. >>>> + limitation fails to propage clkreq signal to the host and due to that host will not send >>>> + refclk, which results in linkdown in L1.2 or L1.1 exit initiated by EP. >>>> + This property if set keeps refclk always on even in Low power states. >>> The property name suggests that's the state of hardware - refclk is >>> always on. Description suggests you want to instruct OS to do something. >>> >>> Again, third time (once from Bjorn, once from Dmitry), rephrase property >>> name and description to describe the hardware issue. I see description >>> improved, but not the property name. Again in the end of description you >> >> Both bjorn and Dmitry gave comments to change the description only, and not >> the property name, >> >> correct if I am wrong. >> >>> say what Linux should do. Bindings do not describe Linux OS. >> >> I will remove the last line in the next patch. >> > > You should name the property as, "qcom,keep-refclk-always-on" Keep the clock by who? By driver? Then not, property should describe physical phenomena or hardware issue being fixed here, not what driver should do. Best regards, Krzysztof