PCI: j721e: Add PCIe support for J722S SoC

TI's J722S SoC has one instance of PCIe namely PCIe0 which is a Gen3
single lane PCIe controller. Add support for the "ti,j722s-pcie-host"
compatible specific to J722S SoC.

Link: https://lore.kernel.org/r/20240524092349.158443-1-s-vadapalli@ti.com
Signed-off-by: Siddharth Vadapalli <s-vadapalli@ti.com>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>

drivers/pci/controller/cadence/pci-j721e.c

@@ -386,6 +386,13 @@ static const struct j721e_pcie_data j784s4_pcie_ep_data = {
 	.max_lanes = 4,
 };
 
+static const struct j721e_pcie_data j722s_pcie_rc_data = {
+	.mode = PCI_MODE_RC,
+	.linkdown_irq_regfield = J7200_LINK_DOWN,
+	.byte_access_allowed = true,
+	.max_lanes = 1,
+};
+
 static const struct of_device_id of_j721e_pcie_match[] = {
 	{
 		.compatible = "ti,j721e-pcie-host",
@@ -419,6 +426,10 @@ static const struct of_device_id of_j721e_pcie_match[] = {
 		.compatible = "ti,j784s4-pcie-ep",
 		.data = &j784s4_pcie_ep_data,
 	},
+	{
+		.compatible = "ti,j722s-pcie-host",
+		.data = &j722s_pcie_rc_data,
+	},
 	{},
 };