[PATCH 1/3] arm64: dts: ti: k3-j721e-evm: Add overlay for PCIe NTB functionality

[Siddharth Vadapalli]

PCIe NTB (Non-Transparent-Bridge) allows connecting the memory of
multiple PCIe Hosts (Root-Complex). The number of such hosts is
determined by the number of PCIe instances configured for NTB operation
on the device which intends to enable NTB functionality. Add a device-tree
overlay to configure PCIE0 and PCIE1 instances of PCIe on J721E EVM for NTB
operation. This shall allow connecting the memory of two PCIe Hosts via
PCIE0 and PCIE1 on J721E EVM.

Signed-off-by: Siddharth Vadapalli <s-vadapalli@xxxxxx>
---
 arch/arm64/boot/dts/ti/Makefile               |  4 +
 .../boot/dts/ti/k3-j721e-evm-pcie-ntb.dtso    | 91 +++++++++++++++++++
 2 files changed, 95 insertions(+)
 create mode 100644 arch/arm64/boot/dts/ti/k3-j721e-evm-pcie-ntb.dtso

diff --git a/arch/arm64/boot/dts/ti/Makefile b/arch/arm64/boot/dts/ti/Makefile
index 8a4bdf87e2d4..1097ab30f5a9 100644
--- a/arch/arm64/boot/dts/ti/Makefile
+++ b/arch/arm64/boot/dts/ti/Makefile
@@ -102,6 +102,7 @@ dtb-$(CONFIG_ARCH_K3) += k3-j721e-beagleboneai64.dtb
 dtb-$(CONFIG_ARCH_K3) += k3-j721e-common-proc-board-infotainment.dtbo
 dtb-$(CONFIG_ARCH_K3) += k3-j721e-evm.dtb
 dtb-$(CONFIG_ARCH_K3) += k3-j721e-evm-gesi-exp-board.dtbo
+dtb-$(CONFIG_ARCH_K3) += k3-j721e-evm-pcie-ntb.dtbo
 dtb-$(CONFIG_ARCH_K3) += k3-j721e-evm-pcie0-ep.dtbo
 dtb-$(CONFIG_ARCH_K3) += k3-j721e-evm-pcie1-ep.dtbo
 dtb-$(CONFIG_ARCH_K3) += k3-j721e-sk.dtb
@@ -201,6 +202,8 @@ k3-j7200-evm-pcie1-ep-dtbs := k3-j7200-common-proc-board.dtb \
 	k3-j7200-evm-pcie1-ep.dtbo
 k3-j721e-common-proc-board-infotainment-dtbs := k3-j721e-common-proc-board.dtb \
 	k3-j721e-common-proc-board-infotainment.dtbo
+k3-j721e-evm-pcie-ntb-dtbs := k3-j721e-common-proc-board.dtb \
+	k3-j721e-evm-pcie-ntb.dtbo
 k3-j721e-evm-pcie0-ep-dtbs := k3-j721e-common-proc-board.dtb \
 	k3-j721e-evm-pcie0-ep.dtbo
 k3-j721e-evm-pcie1-ep-dtbs := k3-j721e-common-proc-board.dtb \
@@ -239,6 +242,7 @@ dtb- += k3-am625-beagleplay-csi2-ov5640.dtb \
 	k3-am69-sk-pcie0-ep.dtb \
 	k3-j7200-evm-pcie1-ep.dtb \
 	k3-j721e-common-proc-board-infotainment.dtb \
+	k3-j721e-evm-pcie-ntb.dtb \
 	k3-j721e-evm-pcie0-ep.dtb \
 	k3-j721e-evm-pcie1-ep.dtb \
 	k3-j721e-sk-csi2-dual-imx219.dtb \
diff --git a/arch/arm64/boot/dts/ti/k3-j721e-evm-pcie-ntb.dtso b/arch/arm64/boot/dts/ti/k3-j721e-evm-pcie-ntb.dtso
new file mode 100644
index 000000000000..4601bc8cd52f
--- /dev/null
+++ b/arch/arm64/boot/dts/ti/k3-j721e-evm-pcie-ntb.dtso
@@ -0,0 +1,91 @@
+// SPDX-License-Identifier: GPL-2.0-only OR MIT
+/**
+ * DT Overlay for enabling NTB functionality using PCIE0 and PCIE1 instances of
+ * PCIe on the J7 common processor board.
+ *
+ * J7 Common Processor Board Product Link: https://www.ti.com/tool/J721EXCPXEVM
+ *
+ * Copyright (C) 2025 Texas Instruments Incorporated - https://www.ti.com/
+ */
+
+/dts-v1/;
+/plugin/;
+
+#include <dt-bindings/interrupt-controller/arm-gic.h>
+#include <dt-bindings/soc/ti,sci_pm_domain.h>
+
+#include "k3-pinctrl.h"
+
+&{/} {
+	epf_bus {
+		compatible = "pci-epf-bus";
+
+		ntb {
+			compatible = "pci-epf-ntb";
+			epcs = <&pcie0_ep>, <&pcie1_ep>;
+			epc-names = "primary", "secondary";
+			vendor-id = /bits/ 16 <0x104c>;
+			device-id = /bits/ 16 <0xb00d>;
+			num-mws = <4>;
+			mws-size = <0x100000>, <0x100000>, <0x100000>, <0x100000>;
+		};
+	};
+};
+
+&pcie0_rc {
+	status = "disabled";
+};
+
+&pcie1_rc {
+	status = "disabled";
+};
+
+&cbass_main {
+	#address-cells = <2>;
+	#size-cells = <2>;
+	interrupt-parent = <&gic500>;
+
+	pcie0_ep: pcie-ep@2900000 {
+		compatible = "ti,j721e-pcie-ep";
+		reg = <0x00 0x02900000 0x00 0x1000>,
+		      <0x00 0x02907000 0x00 0x400>,
+		      <0x00 0x0d000000 0x00 0x00800000>,
+		      <0x00 0x10000000 0x00 0x08000000>;
+		reg-names = "intd_cfg", "user_cfg", "reg", "mem";
+		interrupt-names = "link_state";
+		interrupts = <GIC_SPI 318 IRQ_TYPE_EDGE_RISING>;
+		max-link-speed = <3>;
+		num-lanes = <1>;
+		power-domains = <&k3_pds 239 TI_SCI_PD_EXCLUSIVE>;
+		clocks = <&k3_clks 239 1>;
+		clock-names = "fck";
+		max-functions = /bits/ 8 <6>;
+		max-virtual-functions = /bits/ 8 <4 4 4 4 0 0>;
+		dma-coherent;
+		phys = <&serdes0_pcie_link>;
+		phy-names = "pcie-phy";
+		ti,syscon-pcie-ctrl = <&scm_conf 0x4070>;
+	};
+
+	pcie1_ep: pcie-ep@2910000 {
+		compatible = "ti,j721e-pcie-ep";
+		reg = <0x00 0x02910000 0x00 0x1000>,
+		      <0x00 0x02917000 0x00 0x400>,
+		      <0x00 0x0d800000 0x00 0x00800000>,
+		      <0x00 0x18000000 0x00 0x08000000>;
+		reg-names = "intd_cfg", "user_cfg", "reg", "mem";
+		interrupt-names = "link_state";
+		interrupts = <GIC_SPI 330 IRQ_TYPE_EDGE_RISING>;
+		max-link-speed = <3>;
+		num-lanes = <2>;
+		power-domains = <&k3_pds 240 TI_SCI_PD_EXCLUSIVE>;
+		clocks = <&k3_clks 240 1>;
+		clock-names = "fck";
+		max-functions = /bits/ 8 <6>;
+		max-virtual-functions = /bits/ 8 <4 4 4 4 0 0>;
+		dma-coherent;
+		phys = <&serdes1_pcie_link>;
+		phy-names = "pcie-phy";
+		ti,syscon-pcie-ctrl = <&scm_conf 0x4074>;
+	};
+};
-- 
2.43.0