linux-kernel - Re: [PATCH v5 3/5] arm64: dts: agilex: add dtsi for PCIe Root Port

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Message-ID: <22cb714e-db76-b07-8572-2f70f6848369@linux.intel.com>
Date: Wed, 29 Jan 2025 11:42:40 -0800 (PST)
From: matthew.gerlach@...ux.intel.com
To: Krzysztof Kozlowski <krzk@...nel.org>
cc: lpieralisi@...nel.org, kw@...ux.com, manivannan.sadhasivam@...aro.org, 
    robh@...nel.org, bhelgaas@...gle.com, krzk+dt@...nel.org, 
    conor+dt@...nel.org, dinguyen@...nel.org, joyce.ooi@...el.com, 
    linux-pci@...r.kernel.org, devicetree@...r.kernel.org, 
    linux-kernel@...r.kernel.org, matthew.gerlach@...era.com, 
    peter.colberg@...era.com
Subject: Re: [PATCH v5 3/5] arm64: dts: agilex: add dtsi for PCIe Root Port



On Wed, 29 Jan 2025, Krzysztof Kozlowski wrote:

> On 27/01/2025 18:35, Matthew Gerlach wrote:
>> Add the base device tree for support of the PCIe Root Port
>> for the Agilex family of chips.
>>
>> Signed-off-by: Matthew Gerlach <matthew.gerlach@...ux.intel.com>
>> ---
>> v3:
>>  - Remove accepted patches from patch set.
>>
>> v2:
>>  - Rename node to fix schema check error.
>> ---
>>  .../intel/socfpga_agilex_pcie_root_port.dtsi  | 55 +++++++++++++++++++
>>  1 file changed, 55 insertions(+)
>>  create mode 100644 arch/arm64/boot/dts/intel/socfpga_agilex_pcie_root_port.dtsi
>>
>> diff --git a/arch/arm64/boot/dts/intel/socfpga_agilex_pcie_root_port.dtsi b/arch/arm64/boot/dts/intel/socfpga_agilex_pcie_root_port.dtsi
>> new file mode 100644
>> index 000000000000..50f131f5791b
>> --- /dev/null
>> +++ b/arch/arm64/boot/dts/intel/socfpga_agilex_pcie_root_port.dtsi
>> @@ -0,0 +1,55 @@
>> +// SPDX-License-Identifier:     GPL-2.0
>
> Odd spaces in SPDX tag.

Yes, there should only be one space.

>
>> +/*
>> + * Copyright (C) 2024, Intel Corporation
>> + */
>> +&soc0 {
>> +	aglx_hps_bridges: fpga-bus@...00000 {
>> +		compatible = "simple-bus";
>> +		reg = <0x80000000 0x20200000>,
>> +		      <0xf9000000 0x00100000>;
>> +		reg-names = "axi_h2f", "axi_h2f_lw";
>
> Where is this binding defined?

The bindings for these reg-names are not currently defined anywhere, but 
they are also referenced in the following:
     Documentation/devicetree/bindings/soc/intel/intel,hps-copy-engine.yaml
     arch/arm64/boot/dts/intel/socfpga_agilex_n6000.dts
I am not exactly sure where the right place is to define them, maybe
Documentation/devicetree/bindings/arm/intel,socfpga.yaml. On the other 
hand, no code references these names; so it might make sense to just 
remove them.

>
>> +		#address-cells = <0x2>;
>> +		#size-cells = <0x1>;
>
> These two are not hex.

I will change all #address-cells and #size-cell to decimal.

>
>> +		ranges = <0x00000000 0x00000000 0x80000000 0x00040000>,
>> +			 <0x00000000 0x10000000 0x90100000 0x0ff00000>,
>> +			 <0x00000000 0x20000000 0xa0000000 0x00200000>,
>> +			 <0x00000001 0x00010000 0xf9010000 0x00008000>,
>> +			 <0x00000001 0x00018000 0xf9018000 0x00000080>,
>> +			 <0x00000001 0x00018080 0xf9018080 0x00000010>;
>> +
>> +		pcie_0_pcie_aglx: pcie@...000000 {
>> +			reg = <0x00000000 0x10000000 0x10000000>,
>> +			      <0x00000001 0x00010000 0x00008000>,
>> +			      <0x00000000 0x20000000 0x00200000>;
>> +			reg-names = "Txs", "Cra", "Hip";
>
> Where is this binding defined?

Documentation/devicetree/bindings/pci/altr,pcie-root-port.yaml

>
>
>> +			interrupt-parent = <&intc>;
>> +			interrupts = <GIC_SPI 0x14 IRQ_TYPE_LEVEL_HIGH>;
>> +			interrupt-controller;
>> +			#interrupt-cells = <0x1>;
>> +			device_type = "pci";
>> +			bus-range = <0x0000000 0x000000ff>;
>> +			ranges = <0x82000000 0x00000000 0x00100000 0x00000000 0x10000000 0x00000000 0x0ff00000>;
>> +			msi-parent = <&pcie_0_msi_irq>;
>> +			#address-cells = <0x3>;
>> +			#size-cells = <0x2>;
>
> Same problem for all cells.
>
>> +			interrupt-map-mask = <0x0 0x0 0x0 0x7>;
>> +			interrupt-map = <0x0 0x0 0x0 0x1 &pcie_0_pcie_aglx 0 0 0 0x1>,
>> +					<0x0 0x0 0x0 0x2 &pcie_0_pcie_aglx 0 0 0 0x2>,
>> +					<0x0 0x0 0x0 0x3 &pcie_0_pcie_aglx 0 0 0 0x3>,
>> +					<0x0 0x0 0x0 0x4 &pcie_0_pcie_aglx 0 0 0 0x4>;
>> +			status = "disabled";
>> +		};
>> +
>> +		pcie_0_msi_irq: msi@...08080 {
>> +			compatible = "altr,msi-1.0";
>> +			reg = <0x00000001 0x00018080 0x00000010>,
>> +			      <0x00000001 0x00018000 0x00000080>;
>> +			reg-names = "csr", "vector_slave";
>> +			interrupt-parent = <&intc>;
>> +			interrupts = <GIC_SPI 0x13 IRQ_TYPE_LEVEL_HIGH>;
>> +			msi-controller;
>> +			num-vectors = <0x20>;
>
> That's decimal. Value is for humans and we count numbers in decimal.

I will change num-vectors to decimal.

Thanks for the review,
Matthew Gerlach

>
>
>
> Best regards,
> Krzysztof
>