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Message-ID: <83b4315c-f2d8-419d-9b16-36341764b797@linaro.org>
Date: Mon, 29 Jan 2024 11:54:28 +0100
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Subject: Re: [PATCH 04/14] dt-bindings: phy: qcom,sc8280xp-qmp-pcie-phy: Fix
 the usage of aux clk
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To: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>,
 Bjorn Andersson <andersson@kernel.org>,
 Konrad Dybcio <konrad.dybcio@linaro.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>,
 cros-qcom-dts-watchers@chromium.org
Cc: linux-arm-msm@vger.kernel.org, linux-phy@lists.infradead.org,
 devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
References: <20240124-pcie-aux-clk-fix-v1-0-d8a4852b6ba6@linaro.org>
 <20240124-pcie-aux-clk-fix-v1-4-d8a4852b6ba6@linaro.org>
From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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In-Reply-To: <20240124-pcie-aux-clk-fix-v1-4-d8a4852b6ba6@linaro.org>
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On 24/01/2024 08:36, Manivannan Sadhasivam wrote:
> On some platforms, PHY block requires PCIE_PHY_AUX_CLK to be used when the
> PCIe link enters L1SS state. On those platforms, a dedicated
> PCIE_PHY_AUX_CLK is available from GCC. Other than this, the PHY block
> doesn't require any other "aux" clock, including PCIE_AUX_CLK which only
> required by the PCIe controller.
> 
> Historically, the DTs of the platforms requiring "aux" clock passed
> PCIE_PHY_AUX_CLK as "aux" clock. But over the period of time, platforms
> that do not require this dedicated "aux" clock mistakenly started passing
> the PCIE_AUX_CLK as the "aux" clock. More recently, SA8775P platform passed
> both "aux" (PCIE_AUX_CLK) and "phy_aux" (PCIE_PHY_AUX_CLK) clocks.
> 
> So to clean up this mess, let's remove the newly introduced "phy_aux" clock
> and just use "aux" clock to supply PCIE_PHY_AUX_CLK for platforms that
> require it. For the platforms that do not require a dedicated "aux" clock,
> the clock is removed from DT.
> 
> While at it, let's also define "qcom,sc7280-qmp-pcie-phy" compatible for
> SC7280 SoC which was earlier using the compatible
> "qcom,sm8250-qmp-gen3x2-pcie-phy" as the clock requirement has changed and
> also restructure the "clock-names" property for the affected platforms.
> 
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>


Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

Best regards,
Krzysztof