linux-kernel - Re: [PATCH v3 7/7] arm64: dts: qcom: ipq9574: add PCIe2 nodes

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Message-ID: <20240417073412.GD3894@thinkpad>
Date: Wed, 17 Apr 2024 13:04:12 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Alexandru Gagniuc <mr.nuke.me@...il.com>
Cc: Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>, linux-arm-msm@...r.kernel.org,
	linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org,
	linux-clk@...r.kernel.org
Subject: Re: [PATCH v3 7/7] arm64: dts: qcom: ipq9574: add PCIe2 nodes

On Mon, Apr 15, 2024 at 01:20:52PM -0500, Alexandru Gagniuc wrote:
> On ipq9574, there are 4 PCIe controllers. Describe the pcie2 node, and
> its PHY in devicetree.
> 
> Only pcie2 is described, because only hardware using that controller
> was available for testing.
> 

You should describe all the instances in DT. Since the unused ones will be
'disabled', it won't affect anyone.

> Signed-off-by: Alexandru Gagniuc <mr.nuke.me@...il.com>
> ---
>  arch/arm64/boot/dts/qcom/ipq9574.dtsi | 93 ++++++++++++++++++++++++++-
>  1 file changed, 92 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/ipq9574.dtsi b/arch/arm64/boot/dts/qcom/ipq9574.dtsi
> index 7f2e5cbf3bbb..f075e2715300 100644
> --- a/arch/arm64/boot/dts/qcom/ipq9574.dtsi
> +++ b/arch/arm64/boot/dts/qcom/ipq9574.dtsi
> @@ -300,7 +300,7 @@ gcc: clock-controller@...0000 {
>  				 <0>,
>  				 <0>,
>  				 <0>,
> -				 <0>,
> +				 <&pcie2_phy>,
>  				 <0>,
>  				 <0>;
>  			#clock-cells = <1>;
> @@ -745,6 +745,97 @@ frame@...8000 {
>  				status = "disabled";
>  			};
>  		};
> +
> +		pcie2_phy: phy@...00 {
> +			compatible = "qcom,ipq9574-qmp-gen3x2-pcie-phy";
> +			reg = <0x0008c000 0x14f4>;
> +
> +			clocks = <&gcc GCC_PCIE2_AUX_CLK>,
> +				 <&gcc GCC_PCIE2_AHB_CLK>,
> +				 <&gcc GCC_PCIE2_PIPE_CLK>,
> +				 <&gcc GCC_ANOC_PCIE2_2LANE_M_CLK>,
> +				 <&gcc GCC_SNOC_PCIE2_2LANE_S_CLK>;
> +			clock-names = "aux",
> +				      "cfg_ahb",
> +				      "pipe",
> +				      "anoc",
> +				      "snoc";
> +
> +			clock-output-names = "pcie_phy2_pipe_clk";
> +			#clock-cells = <0>;
> +			#phy-cells = <0>;
> +
> +			resets = <&gcc GCC_PCIE2_PHY_BCR>,
> +				 <&gcc GCC_PCIE2PHY_PHY_BCR>;
> +			reset-names = "phy",
> +				      "common";
> +			status = "disabled";
> +		};
> +
> +		pcie2: pcie@...00000 {
> +			compatible = "qcom,pcie-ipq9574";
> +			reg = <0x20000000 0xf1d>,
> +			      <0x20000f20 0xa8>,
> +			      <0x20001000 0x1000>,
> +			      <0x00088000 0x4000>,
> +			      <0x20100000 0x1000>;
> +			reg-names = "dbi", "elbi", "atu", "parf", "config";
> +
> +			ranges = <0x81000000 0x0 0x20200000 0x20200000 0x0 0x00100000>,	/* I/O */

Please use below range:

<0x01000000 0x0 0x00000000 0x20200000 0x0 0x00100000>
<0x02000000 0x0 0x20300000 0x20300000 0x0 0x07d00000>

> +				 <0x82000000 0x0 0x20300000 0x20300000 0x0 0x07d00000>;	/* MEM */
> +
> +			device_type = "pci";
> +			linux,pci-domain = <3>;
> +			bus-range = <0x00 0xff>;
> +			num-lanes = <2>;
> +			max-link-speed = <3>;
> +			#address-cells = <3>;
> +			#size-cells = <2>;
> +
> +			phys = <&pcie2_phy>;
> +			phy-names = "pciephy";
> +
> +			interrupts = <GIC_SPI 126 IRQ_TYPE_LEVEL_HIGH>;
> +			interrupt-names = "msi";
> +
> +			#interrupt-cells = <1>;
> +			interrupt-map-mask = <0 0 0 0x7>;
> +			interrupt-map = <0 0 0 1 &intc 0 0 164
> +					 IRQ_TYPE_LEVEL_HIGH>, /* int_a */
> +					<0 0 0 2 &intc 0 0 165
> +					 IRQ_TYPE_LEVEL_HIGH>, /* int_b */
> +					<0 0 0 3 &intc 0 0 186
> +					 IRQ_TYPE_LEVEL_HIGH>, /* int_c */
> +					<0 0 0 4 &intc 0 0 187
> +					 IRQ_TYPE_LEVEL_HIGH>; /* int_d */

Use a single line for each INTX entry even if it exceeds 80 column width.

- Mani

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