arm64: dts: qcom: sa8775p: Add ep pcie0 controller node

Add ep pcie dtsi node for pcie0 controller found on sa8775p platform.
It supports gen4 and x2 link width. Limiting the speed to Gen3 due to
stability issues.
Signed-off-by: Mrinmay Sarkar <quic_msarkar@quicinc.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/1714492540-15419-4-git-send-email-quic_msarkar@quicinc.comSigned-off-by: Bjorn Andersson <andersson@kernel.org>

arch/arm64/boot/dts/qcom/sa8775p.dtsi

@@ -3689,6 +3689,52 @@ pcie@0 {
 		};
 	};
 
+	pcie0_ep: pcie-ep@1c00000 {
+		compatible = "qcom,sa8775p-pcie-ep";
+		reg = <0x0 0x01c00000 0x0 0x3000>,
+		      <0x0 0x40000000 0x0 0xf20>,
+		      <0x0 0x40000f20 0x0 0xa8>,
+		      <0x0 0x40001000 0x0 0x4000>,
+		      <0x0 0x40200000 0x0 0x100000>,
+		      <0x0 0x01c03000 0x0 0x1000>,
+		      <0x0 0x40005000 0x0 0x2000>;
+		reg-names = "parf", "dbi", "elbi", "atu", "addr_space",
+			    "mmio", "dma";
+
+		clocks = <&gcc GCC_PCIE_0_AUX_CLK>,
+			<&gcc GCC_PCIE_0_CFG_AHB_CLK>,
+			<&gcc GCC_PCIE_0_MSTR_AXI_CLK>,
+			<&gcc GCC_PCIE_0_SLV_AXI_CLK>,
+			<&gcc GCC_PCIE_0_SLV_Q2A_AXI_CLK>;
+
+		clock-names = "aux",
+			      "cfg",
+			      "bus_master",
+			      "bus_slave",
+			      "slave_q2a";
+
+		interrupts = <GIC_SPI 306 IRQ_TYPE_LEVEL_HIGH>,
+			     <GIC_SPI 147 IRQ_TYPE_LEVEL_HIGH>,
+			     <GIC_SPI 630 IRQ_TYPE_LEVEL_HIGH>;
+
+		interrupt-names = "global", "doorbell", "dma";
+
+		interconnects = <&pcie_anoc MASTER_PCIE_0 0 &mc_virt SLAVE_EBI1 0>,
+				<&gem_noc MASTER_APPSS_PROC 0 &config_noc SLAVE_PCIE_0 0>;
+		interconnect-names = "pcie-mem", "cpu-pcie";
+
+		iommus = <&pcie_smmu 0x0000 0x7f>;
+		resets = <&gcc GCC_PCIE_0_BCR>;
+		reset-names = "core";
+		power-domains = <&gcc PCIE_0_GDSC>;
+		phys = <&pcie0_phy>;
+		phy-names = "pciephy";
+		max-link-speed = <3>; /* FIXME: Limiting the Gen speed due to stability issues */
+		num-lanes = <2>;
+
+		status = "disabled";
+	};
+
 	pcie0_phy: phy@1c04000 {
 		compatible = "qcom,sa8775p-qmp-gen4x2-pcie-phy";
 		reg = <0x0 0x1c04000 0x0 0x2000>;