linux-kernel - Re: [PATCH v2 4/4] dt-bindings: pci: qcom: Document PCIe bindings for SC720

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Date:   Sat, 5 Jun 2021 21:19:07 -0500
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Prasad Malisetty <pmaliset@...eaurora.org>
Cc:     agross@...nel.org, bhelgaas@...gle.com, robh+dt@...nel.org,
        swboyd@...omium.org, lorenzo.pieralisi@....com,
        svarbanov@...sol.com, devicetree@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, mgautam@...eaurora.org,
        dianders@...omium.org, mka@...omium.org, sanm@...eaurora.org
Subject: Re: [PATCH v2 4/4] dt-bindings: pci: qcom: Document PCIe bindings
 for SC720

On Sat 05 Jun 09:40 CDT 2021, Prasad Malisetty wrote:

> 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>
> Acked-by: Rob Herring <robh@...nel.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 25f4def..9c0908f 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
>  			- "qcom,pcie-ipq6018" for ipq6018
> @@ -144,6 +145,22 @@
>  			- "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

If you describe it as pipe _mux_, then name it pipe_mux.

> +			- "pipe_ext"    PIPE output clock

Better to name this in a way that indicates that it is the pipe clock
coming out of the phy, perhaps "phy_pipe".

But that said, as Stephen points out ensuring that the pipe_clk_src's
parent is the phy's clock can be done in DT directly.

Regards,
Bjorn

> +			- "ref"         REFERENCE clock
> +
> +- clock-names:
>  	Usage: required for sdm845
>  	Value type: <stringlist>
>  	Definition: Should contain the following entries
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>