Can RockPRO64 support PCIe Endpoint?

[andrewg132]

I managed to figure it out! The issue was with the starting address for 'mem-base' in the device tree. Setting the starting address to a valid range (0x0000_0000 in my case) enables the driver to be properly loaded and the controller is now present. Below is the device tree overlay I used in Armbian in case anyone else would like to attempt this. 

Code:

/dts-v1/;
/plugin/;
/ {

    fragment@0 {
        target-path = "/pcie@f8000000";
        __overlay__ {
               status = "disabled";
        };
    };

    fragment@1 {
                target-path = "/";
                __overlay__ {
                        pcie_ep0: pcie_ep@f8000000 {
                                compatible = "rockchip,rk3399-pcie-ep";
                                #address-cells = <0x03>;
                                #size-cells = <0x02>;
                                rockchip,max-outbound-regions = <0x10>;
                                max-functions = [08];
                                num-lanes = <0x04>;
                                reg = <0x00 0xfd000000 0x00 0x1000000 0x00 0x00000000 0x00 0x20000>;
                                reg-names = "apb-base\0mem-base";
                                pinctrl-names = "default";
                                pinctrl-0 = <0x17>;
                                phys = <0x15 0x00 0x15 0x01 0x15 0x02 0x15 0x03>;
                                phy-names = "pcie-phy-0\0pcie-phy-1\0pcie-phy-2\0pcie-phy-3";
                                resets = <0x08 0x82 0x08 0x83 0x08 0x84 0x08 0x85 0x08 0x86 0x08 0x81 0x08 0x80>;
                                reset-names = "core\0mgmt\0mgmt-sticky\0pipe\0pm\0pclk\0aclk";
                                clocks = <0x08 0xc5 0x08 0xc4 0x08 0x147 0x08 0xa0>;
                                clock-names = "aclk\0aclk-perf\0hclk\0pm";
                                status = "okay";
                         };
                };
    };
};