pci: layerscape: Manage PCIe EP compatible string via Kconfig

The ep node device tree name is governed by these bindings:
https://github.com/torvalds/linux/blob/master/Documentation/
devicetree/bindings/pci/layerscape-pci.txt#L24

As per above the ep compatible node contains platform name.
Therefore, define the ep node compatible as CONFIG to find the
pcie ep node in device tree during device tree fixup.
Signed-off-by: NPankaj Bansal <pankaj.bansal@nxp.com>
Signed-off-by: NPriyanka Jain <priyanka.jain@nxp.com>

drivers/pci/Kconfig

@@ -158,6 +158,15 @@ config FSL_PCIE_COMPAT
 	  This compatible is used to find pci controller node in Kernel DT
 	  to complete fixup.
 
+config FSL_PCIE_EP_COMPAT
+	string "PCIe EP compatible of Kernel DT"
+	depends on PCIE_LAYERSCAPE || PCIE_LAYERSCAPE_GEN4
+	default "fsl,lx2160a-pcie-ep" if ARCH_LX2160A
+	default "fsl,ls-pcie-ep"
+	help
+	  This compatible is used to find pci controller ep node in Kernel DT
+	  to complete fixup.
+
 config PCIE_INTEL_FPGA
 	bool "Intel FPGA PCIe support"
 	depends on DM_PCI

drivers/pci/pcie_layerscape_fixup.c

@@ -253,7 +253,7 @@ static void ft_pcie_ep_fix(void *blob, struct ls_pcie *pcie)
 {
 	int off;
 
-	off = fdt_node_offset_by_compat_reg(blob, "fsl,ls-pcie-ep",
+	off = fdt_node_offset_by_compat_reg(blob, CONFIG_FSL_PCIE_EP_COMPAT,
 					    pcie->dbi_res.start);
 	if (off < 0)
 		return;

drivers/pci/pcie_layerscape_gen4_fixup.c

@@ -191,7 +191,7 @@ static void ft_pcie_ep_layerscape_gen4_fix(void *blob, struct ls_pcie_g4 *pcie)
 {
 	int off;
 
-	off = fdt_node_offset_by_compat_reg(blob, "fsl,lx2160a-pcie-ep",
+	off = fdt_node_offset_by_compat_reg(blob, CONFIG_FSL_PCIE_EP_COMPAT,
 					    pcie->ccsr_res.start);
 
 	if (off < 0) {