linux-kernel - Re: [PATCH v7 2/3] arm64: dts: qcom: sa8775p: remove aux clock from pcie phy

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Message-ID: <8dca591d-0a4e-43ee-903a-7a6dccff9250@oss.qualcomm.com>
Date: Tue, 29 Jul 2025 15:32:03 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Ziyue Zhang <ziyue.zhang@....qualcomm.com>, andersson@...nel.org,
        konradybcio@...nel.org, robh@...nel.org, krzk+dt@...nel.org,
        conor+dt@...nel.org, jingoohan1@...il.com, mani@...nel.org,
        lpieralisi@...nel.org, kwilczynski@...nel.org, bhelgaas@...gle.com,
        johan+linaro@...nel.org, vkoul@...nel.org, kishon@...nel.org,
        neil.armstrong@...aro.org, abel.vesa@...aro.org, kw@...ux.com
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-phy@...ts.infradead.org, qiang.yu@....qualcomm.com,
        quic_krichai@...cinc.com, quic_vbadigan@...cinc.com
Subject: Re: [PATCH v7 2/3] arm64: dts: qcom: sa8775p: remove aux clock from
 pcie phy

On 7/25/25 12:22 PM, Ziyue Zhang wrote:
> The gcc_aux_clk is used by the PCIe Root Complex (RC) and is not required
> by the PHY. The correct clock for the PHY is gcc_phy_aux_clk, which this
> patch uses to replace the incorrect reference.
> 
> The distinction between AUX_CLK and PHY_AUX_CLK is important: AUX_CLK is
> typically used by the controller, while PHY_AUX_CLK is required by certain
> PHYs—particularly Gen4 QMP PHYs—for internal operations such as clock
> gating and power management. Some non-Gen4 Qualcomm PHYs also use
> PHY_AUX_CLK, but they do not require AUX_CLK.
> 
> This change ensures proper clock configuration and avoids unnecessary
> dependencies.
> 
> Signed-off-by: Ziyue Zhang <ziyue.zhang@....qualcomm.com>
> ---

Reviewed-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>

Konrad