arm64: dts: rockchip: Add PCIe endpoint mode support

Add a device tree node representing PCIe endpoint mode.

The controller can either be configured to run in Root Complex or Endpoint
mode.

If a user wants to run the controller in endpoint mode, the user has to
disable the pcie3x4 node and enable the pcie3x4_ep node.
Signed-off-by: Niklas Cassel <cassel@kernel.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20240607-rockchip-pcie-ep-v1-v5-12-0a042d6b0049@kernel.orgSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3588-extra.dtsi

@@ -186,6 +186,41 @@ pcie3x4_intc: legacy-interrupt-controller {
 		};
 	};
 
+	pcie3x4_ep: pcie-ep@fe150000 {
+		compatible = "rockchip,rk3588-pcie-ep";
+		reg = <0xa 0x40000000 0x0 0x00100000>,
+		      <0xa 0x40100000 0x0 0x00100000>,
+		      <0x0 0xfe150000 0x0 0x00010000>,
+		      <0x9 0x00000000 0x0 0x40000000>,
+		      <0xa 0x40300000 0x0 0x00100000>;
+		reg-names = "dbi", "dbi2", "apb", "addr_space", "atu";
+		clocks = <&cru ACLK_PCIE_4L_MSTR>, <&cru ACLK_PCIE_4L_SLV>,
+			 <&cru ACLK_PCIE_4L_DBI>, <&cru PCLK_PCIE_4L>,
+			 <&cru CLK_PCIE_AUX0>, <&cru CLK_PCIE4L_PIPE>;
+		clock-names = "aclk_mst", "aclk_slv",
+			      "aclk_dbi", "pclk",
+			      "aux", "pipe";
+		interrupts = <GIC_SPI 263 IRQ_TYPE_LEVEL_HIGH 0>,
+			     <GIC_SPI 262 IRQ_TYPE_LEVEL_HIGH 0>,
+			     <GIC_SPI 261 IRQ_TYPE_LEVEL_HIGH 0>,
+			     <GIC_SPI 260 IRQ_TYPE_LEVEL_HIGH 0>,
+			     <GIC_SPI 259 IRQ_TYPE_LEVEL_HIGH 0>,
+			     <GIC_SPI 271 IRQ_TYPE_LEVEL_HIGH 0>,
+			     <GIC_SPI 272 IRQ_TYPE_LEVEL_HIGH 0>,
+			     <GIC_SPI 269 IRQ_TYPE_LEVEL_HIGH 0>,
+			     <GIC_SPI 270 IRQ_TYPE_LEVEL_HIGH 0>;
+		interrupt-names = "sys", "pmc", "msg", "legacy", "err",
+				  "dma0", "dma1", "dma2", "dma3";
+		max-link-speed = <3>;
+		num-lanes = <4>;
+		phys = <&pcie30phy>;
+		phy-names = "pcie-phy";
+		power-domains = <&power RK3588_PD_PCIE>;
+		resets = <&cru SRST_PCIE0_POWER_UP>, <&cru SRST_P_PCIE0>;
+		reset-names = "pwr", "pipe";
+		status = "disabled";
+	};
+
 	pcie3x2: pcie@fe160000 {
 		compatible = "rockchip,rk3588-pcie", "rockchip,rk3568-pcie";
 		#address-cells = <3>;