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

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Date:   Fri, 04 Jun 2021 16:56:57 +0530
From:   Prasad Malisetty <pmaliset@...eaurora.org>
To:     Stephen Boyd <swboyd@...omium.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

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.
> 
>> +                       - "pipe_ext"    PIPE output clock
> 
> Is pipe output different from pipe?
> 
Yes, pipe_ext clock will generate after PHY init.
>> +                       - "ref"         REFERENCE clock
>> +
>>