linux-kernel - Re: [PATCH 1/3] dt-bindings: pci: qcom: Document PCIe bindings for SC720

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Message-ID: <CAE-0n52y3yuyOrexC+EsnsX6ULDwKDz1PczGwHB211hKu=uj1g@mail.gmail.com>
Date:   Fri, 4 Jun 2021 21:44:32 +0000
From:   Stephen Boyd <swboyd@...omium.org>
To:     Prasad Malisetty <pmaliset@...eaurora.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        mgautam@...eaurora.org, dianders@...omium.org, mka@...omium.org
Subject: Re: [PATCH 1/3] dt-bindings: pci: qcom: Document PCIe bindings for SC720

Quoting Prasad Malisetty (2021-06-04 04:26:57)
> On 2021-05-08 01:29, Stephen Boyd wrote:
> > Quoting Prasad Malisetty (2021-05-07 03:17:26)
> >> Document the PCIe DT bindings for SC7280 SoC.The PCIe IP is similar
> >> to the one used on SM8250. Add the compatible for SC7280.
> >>
> >> Signed-off-by: Prasad Malisetty <pmaliset@...eaurora.org>
> >> ---
> >>  Documentation/devicetree/bindings/pci/qcom,pcie.txt | 17
> >> +++++++++++++++++
> >>  1 file changed, 17 insertions(+)
> >>
> >> diff --git a/Documentation/devicetree/bindings/pci/qcom,pcie.txt
> >> b/Documentation/devicetree/bindings/pci/qcom,pcie.txt
> >> index 0da458a..e5245ed 100644
> >> --- a/Documentation/devicetree/bindings/pci/qcom,pcie.txt
> >> +++ b/Documentation/devicetree/bindings/pci/qcom,pcie.txt
> >> @@ -12,6 +12,7 @@
> >>                         - "qcom,pcie-ipq4019" for ipq4019
> >>                         - "qcom,pcie-ipq8074" for ipq8074
> >>                         - "qcom,pcie-qcs404" for qcs404
> >> +                       - "qcom,pcie-sc7280" for sc7280
> >>                         - "qcom,pcie-sdm845" for sdm845
> >>                         - "qcom,pcie-sm8250" for sm8250
> >>
> >> @@ -133,6 +134,22 @@
> >>                         - "slave_bus"   AXI Slave clock
> >>
> >>  - clock-names:
> >> +       Usage: required for sc7280
> >> +       Value type: <stringlist>
> >> +       Definition: Should contain the following entries
> >> +                       - "aux"         Auxiliary clock
> >> +                       - "cfg"         Configuration clock
> >> +                       - "bus_master"  Master AXI clock
> >> +                       - "bus_slave"   Slave AXI clock
> >> +                       - "slave_q2a"   Slave Q2A clock
> >> +                       - "tbu"         PCIe TBU clock
> >> +                       - "ddrss_sf_tbu" PCIe SF TBU clock
> >> +                       - "pipe"        PIPE clock
> >> +                       - "pipe_src"    PIPE MUX
> >
> > Is pipe_src necessary? Is it the parent of the pipe clk? If so, please
> > remove it and do whatever is necessary on the pipe clk instead of the
> > parent of the clk.
>
> Here pipe_src is MUX. Newer targets require changing pipe-clk mux to
> switch between pipe_clk and XO for GDSC enable.
> After PHY init, need to configure MUX.

Ok. I see, so we have to change the parent of the parent of the pipe
clk?