linux-kernel - Re: [PATCH v6 5/6] arm64: dts: qcom: ipq5018: Add PCIe related nodes

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Message-ID: <a4n3w62bg6x2iux4z7enu3po56hr5pcavjfmvtzdcwv2w4ptrr@ssvfdrltfg5y>
Date: Mon, 24 Mar 2025 13:26:36 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: george.moussalem@...look.com
Cc: Vinod Koul <vkoul@...nel.org>, 
	Kishon Vijay Abraham I <kishon@...nel.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Nitheesh Sekar <quic_nsekar@...cinc.com>, Varadarajan Narayanan <quic_varada@...cinc.com>, 
	Bjorn Helgaas <bhelgaas@...gle.com>, Lorenzo Pieralisi <lpieralisi@...nel.org>, 
	Krzysztof Wilczyński <kw@...ux.com>, Bjorn Andersson <andersson@...nel.org>, 
	Konrad Dybcio <konradybcio@...nel.org>, linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org, 
	20250317100029.881286-2-quic_varada@...cinc.com, Sricharan R <quic_srichara@...cinc.com>
Subject: Re: [PATCH v6 5/6] arm64: dts: qcom: ipq5018: Add PCIe related nodes

On Fri, Mar 21, 2025 at 04:14:43PM +0400, George Moussalem via B4 Relay wrote:
> From: Nitheesh Sekar <quic_nsekar@...cinc.com>
> 
> Add phy and controller nodes for a 2-lane Gen2 and

Controller is Gen 3 capable but you are limiting it to Gen 2.

> a 1-lane Gen2 PCIe bus. IPQ5018 has 8 MSI SPI interrupts and
> one global interrupt.
> 
> Signed-off-by: Nitheesh Sekar <quic_nsekar@...cinc.com>
> Signed-off-by: Sricharan R <quic_srichara@...cinc.com>
> Signed-off-by: George Moussalem <george.moussalem@...look.com>

One comment below. With that addressed,

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

> ---
>  arch/arm64/boot/dts/qcom/ipq5018.dtsi | 234 +++++++++++++++++++++++++++++++++-
>  1 file changed, 232 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/ipq5018.dtsi b/arch/arm64/boot/dts/qcom/ipq5018.dtsi
> index 8914f2ef0bc4..d08034b57e80 100644
> --- a/arch/arm64/boot/dts/qcom/ipq5018.dtsi
> +++ b/arch/arm64/boot/dts/qcom/ipq5018.dtsi
> @@ -147,6 +147,40 @@ usbphy0: phy@...00 {
>  			status = "disabled";
>  		};
>  
> +		pcie1_phy: phy@...00{
> +			compatible = "qcom,ipq5018-uniphy-pcie-phy";
> +			reg = <0x0007e000 0x800>;
> +
> +			clocks = <&gcc GCC_PCIE1_PIPE_CLK>;
> +
> +			resets = <&gcc GCC_PCIE1_PHY_BCR>,
> +				 <&gcc GCC_PCIE1PHY_PHY_BCR>;
> +
> +			#clock-cells = <0>;
> +			#phy-cells = <0>;
> +
> +			num-lanes = <1>;
> +
> +			status = "disabled";
> +		};
> +
> +		pcie0_phy: phy@...00{
> +			compatible = "qcom,ipq5018-uniphy-pcie-phy";
> +			reg = <0x00086000 0x800>;
> +
> +			clocks = <&gcc GCC_PCIE0_PIPE_CLK>;
> +
> +			resets = <&gcc GCC_PCIE0_PHY_BCR>,
> +				 <&gcc GCC_PCIE0PHY_PHY_BCR>;
> +
> +			#clock-cells = <0>;
> +			#phy-cells = <0>;
> +
> +			num-lanes = <2>;
> +
> +			status = "disabled";
> +		};
> +
>  		tlmm: pinctrl@...0000 {
>  			compatible = "qcom,ipq5018-tlmm";
>  			reg = <0x01000000 0x300000>;
> @@ -170,8 +204,8 @@ gcc: clock-controller@...0000 {
>  			reg = <0x01800000 0x80000>;
>  			clocks = <&xo_board_clk>,
>  				 <&sleep_clk>,
> -				 <0>,
> -				 <0>,
> +				 <&pcie0_phy>,
> +				 <&pcie1_phy>,
>  				 <0>,
>  				 <0>,
>  				 <0>,
> @@ -387,6 +421,202 @@ frame@...8000 {
>  				status = "disabled";
>  			};
>  		};
> +
> +		pcie1: pcie@...00000 {
> +			compatible = "qcom,pcie-ipq5018";
> +			reg = <0x80000000 0xf1d>,
> +			      <0x80000f20 0xa8>,
> +			      <0x80001000 0x1000>,
> +			      <0x00078000 0x3000>,
> +			      <0x80100000 0x1000>,
> +			      <0x0007b000 0x1000>;
> +			reg-names = "dbi",
> +				    "elbi",
> +				    "atu",
> +				    "parf",
> +				    "config",
> +				    "mhi";
> +			device_type = "pci";
> +			linux,pci-domain = <0>;
> +			bus-range = <0x00 0xff>;
> +			num-lanes = <1>;
> +			max-link-speed = <2>;

This still needs some justification. If Qcom folks didn't reply, atleast move
this to board dts with a comment saying that the link is not coming up with
Gen3.

- Mani

-- 
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