linux-kernel - Re: [PATCH v1 2/2] arm64: dts: qcom: sa8775p: Add ep pcie1 controller node

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Message-ID: <i3yum3wbko33jwn7tfbcflpcxe5k5j5ituhyxtucx6gk2bs3gz@7ncewfmepnai>
Date:   Tue, 7 Nov 2023 12:37:58 -0600
From:   Andrew Halaney <ahalaney@...hat.com>
To:     Mrinmay Sarkar <quic_msarkar@...cinc.com>
Cc:     agross@...nel.org, andersson@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        konrad.dybcio@...aro.org, mani@...nel.org, robh+dt@...nel.org,
        quic_shazhuss@...cinc.com, quic_nitegupt@...cinc.com,
        quic_ramkri@...cinc.com, quic_nayiluri@...cinc.com,
        dmitry.baryshkov@...aro.org, robh@...nel.org,
        quic_krichai@...cinc.com, quic_vbadigan@...cinc.com,
        quic_parass@...cinc.com, quic_schintav@...cinc.com,
        quic_shijjose@...cinc.com, Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org
Subject: Re: [PATCH v1 2/2] arm64: dts: qcom: sa8775p: Add ep pcie1
 controller node

On Tue, Nov 07, 2023 at 06:34:53PM +0530, Mrinmay Sarkar wrote:
> Add ep pcie dtsi node for pcie1 controller found on sa8775p platform.
> It supports gen4 and x4 link width. Limiting the speed to Gen3 due to
> stability issues.

I wouldn't mind a bit more information on what "stability" issues
entails! I'm a sucker for details in a commit message.

> 
> Signed-off-by: Mrinmay Sarkar <quic_msarkar@...cinc.com>
> ---
>  arch/arm64/boot/dts/qcom/sa8775p.dtsi | 48 +++++++++++++++++++++++++++++++++++
>  1 file changed, 48 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sa8775p.dtsi b/arch/arm64/boot/dts/qcom/sa8775p.dtsi
> index 7eab458..acd7bd8 100644
> --- a/arch/arm64/boot/dts/qcom/sa8775p.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sa8775p.dtsi
> @@ -3732,6 +3732,54 @@
>  		status = "disabled";
>  	};
>  
> +	pcie1_ep: pcie-ep@...0000 {
> +		compatible = "qcom,sa8775p-pcie-ep";
> +		reg = <0x0 0x01c10000 0x0 0x3000>,
> +		      <0x0 0x60000000 0x0 0xf20>,
> +		      <0x0 0x60000f20 0x0 0xa8>,
> +		      <0x0 0x60001000 0x0 0x4000>,
> +		      <0x0 0x60200000 0x0 0x100000>,
> +		      <0x0 0x01c13000 0x0 0x1000>,
> +			  <0x0 0x60005000 0x0 0x2000>;
> +		reg-names = "parf", "dbi", "elbi", "atu", "addr_space",
> +			    "mmio", "dma";
> +
> +		clocks = <&gcc GCC_PCIE_1_AUX_CLK>,
> +			 <&gcc GCC_PCIE_1_CFG_AHB_CLK>,
> +			 <&gcc GCC_PCIE_1_MSTR_AXI_CLK>,
> +			 <&gcc GCC_PCIE_1_SLV_AXI_CLK>,
> +			 <&gcc GCC_PCIE_1_SLV_Q2A_AXI_CLK>;
> +
> +		clock-names = "aux",
> +			      "cfg",
> +			      "bus_master",
> +			      "bus_slave",
> +			      "slave_q2a";
> +
> +		interrupts = <GIC_SPI 518 IRQ_TYPE_LEVEL_HIGH>,
> +					 <GIC_SPI 152 IRQ_TYPE_LEVEL_HIGH>,
> +					 <GIC_SPI 474 IRQ_TYPE_LEVEL_HIGH>;
> +
> +		interrupt-names = "global", "doorbell", "dma";
> +
> +		interconnects = <&pcie_anoc MASTER_PCIE_1 0 &mc_virt SLAVE_EBI1 0>,
> +				<&gem_noc MASTER_APPSS_PROC 0 &config_noc SLAVE_PCIE_1 0>;

I keep seeing Konrad requesting that we use the #define instead of a raw
number 0, i.e. something like QCOM_ICC_TAG_ALWAYS (although if I'm
reading that correctly QCOM_ICC_TAG_ALWAYS doesn't evaluate to 0, so
make sure you pick the appropriate one).

> +		interconnect-names = "pcie-mem", "cpu-pcie";

This is nitpicky, but unless someone told you to do the whitespace
between some of these properties I'd get more consistent. i.e. reg and
reg-names has no newline between them, but clocks and clock-names does,
and then interconnects/interconnect-names does not.

> +
> +		dma-coherent;
> +
> +		iommus = <&pcie_smmu 0x80 0x7f>;
> +		resets = <&gcc GCC_PCIE_1_BCR>;
> +		reset-names = "core";
> +		power-domains = <&gcc PCIE_1_GDSC>;
> +		phys = <&pcie1_phy>;
> +		phy-names = "pciephy";
> +		max-link-speed = <3>; /* FIXME: Limiting the Gen speed due to stability issues */
> +		num-lanes = <4>;
> +
> +		status = "disabled";
> +	};
> +
>  	pcie1_phy: phy@...4000 {
>  		compatible = "qcom,sa8775p-qmp-gen4x4-pcie-phy";
>  		reg = <0x0 0x1c14000 0x0 0x4000>;
> -- 
> 2.7.4
> 
>