arm64: dts: rockchip: Add dtsi entry for RK3399 PCIe endpoint core

Add dtsi entry for RK3399 PCIe endpoint core in the device tree.
The status is "disabled" by default, so it will not be loaded unless
explicitly chosen to. The RK3399 PCIe endpoit core should be enabled
with the RK3399 PCIe root complex disabled because the RK3399 PCIe
controller can only work one mode at the time, either in "root complex"
mode or in "endpoint" mode.
Tested-by: Damien Le Moal <dlemoal@kernel.org>
Signed-off-by: Rick Wertenbroek <rick.wertenbroek@gmail.com>
Link: https://lore.kernel.org/r/20230418074700.1083505-6-rick.wertenbroek@gmail.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3399.dtsi

@@ -265,6 +265,33 @@ pcie0_intc: interrupt-controller {
 		};
 	};
 
+	pcie0_ep: pcie-ep@f8000000 {
+		compatible = "rockchip,rk3399-pcie-ep";
+		reg = <0x0 0xfd000000 0x0 0x1000000>,
+		      <0x0 0xfa000000 0x0 0x2000000>;
+		reg-names = "apb-base", "mem-base";
+		clocks = <&cru ACLK_PCIE>, <&cru ACLK_PERF_PCIE>,
+			 <&cru PCLK_PCIE>, <&cru SCLK_PCIE_PM>;
+		clock-names = "aclk", "aclk-perf",
+			      "hclk", "pm";
+		max-functions = /bits/ 8 <8>;
+		num-lanes = <4>;
+		resets = <&cru SRST_PCIE_CORE>, <&cru SRST_PCIE_MGMT>,
+			 <&cru SRST_PCIE_MGMT_STICKY>, <&cru SRST_PCIE_PIPE>,
+			 <&cru SRST_PCIE_PM>, <&cru SRST_P_PCIE>,
+			 <&cru SRST_A_PCIE>;
+		reset-names = "core", "mgmt", "mgmt-sticky", "pipe",
+			      "pm", "pclk", "aclk";
+		phys = <&pcie_phy 0>, <&pcie_phy 1>,
+		       <&pcie_phy 2>, <&pcie_phy 3>;
+		phy-names = "pcie-phy-0", "pcie-phy-1",
+			    "pcie-phy-2", "pcie-phy-3";
+		rockchip,max-outbound-regions = <32>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&pcie_clkreqnb_cpm>;
+		status = "disabled";
+	};
+
 	gmac: ethernet@fe300000 {
 		compatible = "rockchip,rk3399-gmac";
 		reg = <0x0 0xfe300000 0x0 0x10000>;