PCI: rcar: Add gen2 fallback compatibility string for pcie-rcar

Add fallback compatibility string for R-Car Gen 2 family.  This is in
keeping with the fallback scheme being adopted wherever appropriate for
drivers for Renesas SoCs.

Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

2 files changed, 12 insertions, 4 deletions

diff --git a/Documentation/devicetree/bindings/pci/rcar-pci.txt b/Documentation/devicetree/bindings/pci/rcar-pci.txt
index ab2e75f59518..558fe528ae19 100644
--- a/Documentation/devicetree/bindings/pci/rcar-pci.txt
+++ b/Documentation/devicetree/bindings/pci/rcar-pci.txt
@@ -1,9 +1,16 @@
 * Renesas RCar PCIe interface
 
 Required properties:
-- compatible: should contain one of the following
-        "renesas,pcie-r8a7779", "renesas,pcie-r8a7790", "renesas,pcie-r8a7791",
-        "renesas,pcie-r8a7795"
+compatible: "renesas,pcie-r8a7779" for the R8A7779 SoC;
+            "renesas,pcie-r8a7790" for the R8A7790 SoC;
+            "renesas,pcie-r8a7791" for the R8A7791 SoC;
+            "renesas,pcie-r8a7795" for the R8A7795 SoC;
+            "renesas,pcie-rcar-gen2" for a generic R-Car Gen2 compatible device.
+
+            When compatible with the generic version, nodes must list the
+            SoC-specific version corresponding to the platform first
+            followed by the generic version.
+
 - reg: base address and length of the pcie controller registers.
 - #address-cells: set to <3>
 - #size-cells: set to <2>
@@ -26,7 +33,7 @@ Example:
 SoC specific DT Entry:
 
         pcie: pcie@fe000000 {
-                compatible = "renesas,pcie-r8a7791";
+                compatible = "renesas,pcie-r8a7791", "renesas,pcie-rcar-gen2";
                 reg = <0 0xfe000000 0 0x80000>;
                 #address-cells = <3>;
                 #size-cells = <2>;
diff --git a/drivers/pci/host/pcie-rcar.c b/drivers/pci/host/pcie-rcar.c
index 0c819a00e8ce..5c2962646b17 100644
--- a/drivers/pci/host/pcie-rcar.c
+++ b/drivers/pci/host/pcie-rcar.c
@@ -915,6 +915,7 @@ static int rcar_pcie_parse_map_dma_ranges(struct rcar_pcie *pcie,
 
 static const struct of_device_id rcar_pcie_of_match[] = {
         { .compatible = "renesas,pcie-r8a7779", .data = rcar_pcie_hw_init_h1 },
+        { .compatible = "renesas,pcie-rcar-gen2", .data = rcar_pcie_hw_init },
         { .compatible = "renesas,pcie-r8a7790", .data = rcar_pcie_hw_init },
         { .compatible = "renesas,pcie-r8a7791", .data = rcar_pcie_hw_init },
         { .compatible = "renesas,pcie-r8a7795", .data = rcar_pcie_hw_init },