Re: [PATCH 5/7] ARM: dts: aspeed-g6: Add PCIe RC node

[Bjorn Helgaas]

On Fri, Jun 13, 2025 at 11:29:59AM +0800, Jacky Chou wrote:
> The AST2600 has one PCIe RC, and add the relative configure regmap.

> +			pcie0: pcie@1e7700c0 {
> +				compatible = "aspeed,ast2600-pcie";
> +				device_type = "pci";
> +				reg = <0x1e7700c0 0x40>;
> +				linux,pci-domain = <0>;
> +				#address-cells = <3>;
> +				#size-cells = <2>;
> +				interrupts = <GIC_SPI 168 IRQ_TYPE_LEVEL_HIGH>;
> +				bus-range = <0x80 0xff>;
> +
> +				ranges = <0x01000000 0x0 0x00018000 0x00018000 0x0 0x00008000
> +					  0x02000000 0x0 0x70000000 0x70000000 0x0 0x10000000>;
> +
> +				status = "disabled";
> +
> +				resets = <&syscon ASPEED_RESET_H2X>,
> +					 <&syscon ASPEED_RESET_PCIE_RC_O>;
> +				reset-names = "h2x", "perst";

PERST# is clearly a per-Root Port item since it's a signal on the PCIe
connector.  Can you separate this and any other per-Root Port things
into a Root Port stanza to leave open the possibility of future
hardware that supports multiple Root Ports in the RC?

> +				clocks = <&syscon ASPEED_CLK_GATE_BCLK>;
> +				pinctrl-names = "default";
> +				pinctrl-0 = <&pinctrl_pcierc1_default>;
> +
> +				#interrupt-cells = <1>;
> +				msi-parent = <&pcie0>;
> +				msi-controller;
> +				msi_address = <0x1e77005c>;
> +
> +				aspeed,ahbc = <&ahbc>;
> +				aspeed,pciecfg = <&pcie_cfg>;
> +				aspeed,pciephy = <&pcie_phy1>;
> +
> +				interrupt-map-mask = <0 0 0 7>;
> +				interrupt-map = <0 0 0 1 &pcie_intc0 0>,
> +						<0 0 0 2 &pcie_intc0 1>,
> +						<0 0 0 3 &pcie_intc0 2>,
> +						<0 0 0 4 &pcie_intc0 3>;
> +				pcie_intc0: interrupt-controller {
> +					interrupt-controller;
> +					#address-cells = <0>;
> +					#interrupt-cells = <1>;
> +				};
> +			};
> +
>  			gfx: display@1e6e6000 {
>  				compatible = "aspeed,ast2600-gfx", "syscon";
>  				reg = <0x1e6e6000 0x1000>;
> -- 
> 2.43.0
>