linux-kernel - Re: [PATCH v4 8/8] arm64: dts: qcom: ipq9574: add PCIe2 and PCIe3 nodes

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Date: Fri, 28 Jun 2024 15:07:14 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: "Alex G." <mr.nuke.me@...il.com>
Cc: Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, linux-kernel@...r.kernel.org,
	quic_kathirav@...cinc.com, linux-arm-msm@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH v4 8/8] arm64: dts: qcom: ipq9574: add PCIe2 and PCIe3
 nodes

On Thu, Jun 27, 2024 at 11:39:10PM -0500, Alex G. wrote:
> 
> 
> On 6/23/24 23:18, Manivannan Sadhasivam wrote:
> > On Tue, Apr 30, 2024 at 11:07:50PM -0500, Alexandru Gagniuc wrote:
> > > On ipq9574, there are 4 PCIe controllers. Describe the pcie2 and pcie3
> > > nodes, and their PHYs in devicetree.
> > > 
> > > The pcie0 and pcie1 controllers use a gen3x1 PHY, which is not
> > > currently supported. Hence, only pcie2 and pcie3 are described. Only
> > > pcie2 was tested because my devboard only has conenctions to pcie2.
> > > 
> > > Signed-off-by: Alexandru Gagniuc <mr.nuke.me@...il.com>
> > > ---
> > >   arch/arm64/boot/dts/qcom/ipq9574.dtsi | 178 +++++++++++++++++++++++++-
> > >   1 file changed, 176 insertions(+), 2 deletions(-)
> > > 
> > > diff --git a/arch/arm64/boot/dts/qcom/ipq9574.dtsi b/arch/arm64/boot/dts/qcom/ipq9574.dtsi
> > > index 7f2e5cbf3bbb..c391886cf9ab 100644
> > > --- a/arch/arm64/boot/dts/qcom/ipq9574.dtsi
> > > +++ b/arch/arm64/boot/dts/qcom/ipq9574.dtsi
> > > @@ -300,8 +300,8 @@ gcc: clock-controller@...0000 {
> > >   				 <0>,
> > >   				 <0>,
> > >   				 <0>,
> > > -				 <0>,
> > > -				 <0>,
> > > +				 <&pcie2_phy>,
> > > +				 <&pcie3_phy>,
> > >   				 <0>;
> > >   			#clock-cells = <1>;
> > >   			#reset-cells = <1>;
> > > @@ -745,6 +745,180 @@ 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>;
> > > +			clock-names = "aux",
> > > +				      "cfg_ahb",
> > > +				      "pipe";
> > > +
> > > +			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";
> > > +		};
> > > +
> > > +		pcie3_phy: phy@...00 {
> > > +			compatible = "qcom,ipq9574-qmp-gen3x2-pcie-phy";
> > > +			reg = <0x000f4000 0x14f4>;
> > > +
> > > +			clocks = <&gcc GCC_PCIE3_AUX_CLK>,
> > > +				 <&gcc GCC_PCIE3_AHB_CLK>,
> > > +				 <&gcc GCC_PCIE3_PIPE_CLK>;
> > > +			clock-names = "aux",
> > > +				      "cfg_ahb",
> > > +				      "pipe";
> > > +
> > > +			clock-output-names = "pcie_phy3_pipe_clk";
> > > +			#clock-cells = <0>;
> > > +			#phy-cells = <0>;
> > > +
> > > +			resets = <&gcc GCC_PCIE3_PHY_BCR>,
> > > +				 <&gcc GCC_PCIE3PHY_PHY_BCR>;
> > > +			reset-names = "phy",
> > > +				      "common";
> > > +			status = "disabled";
> > > +		};
> > > +
> > > +		/* TODO: Populate pcie0/pcie1 when gen3x1 phy support is added. */
> > > +
> > > +		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>,
> > > +				 <0x82000000 0x0 0x20300000 0x20300000 0x0 0x07d00000>;
> > 
> > Please cross check 'ranges' property with other platforms.
> > 
> <snip>
> > 
> > Cross check 'interrupt-map' as well.
> 
> I'm not seeing the smoking gun. What am I looking for?
> 

Ah, nvm. I misread the '#address-cells' property of the GIC. This is fine.

- Mani

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