PCI: rcar: Add R-Car PCIe device tree bindings

This patch adds the bindings for the R-Car PCIe driver.  The driver resides
under drivers/pci/host/pcie-rcar.c

Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
Acked-by: Simon Horman <horms+renesas@verge.net.au>
(cherry picked from commit 7869fc6e295cbb1f80e30555bebbc795abb5b9a7)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

diff --git a/Documentation/devicetree/bindings/pci/rcar-pci.txt b/Documentation/devicetree/bindings/pci/rcar-pci.txt
new file mode 100644 (file)
index 0000000..29d3b98
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/rcar-pci.txt
@@ -0,0 +1,47 @@
+* Renesas RCar PCIe interface
+
+Required properties:
+- compatible: should contain one of the following
+       "renesas,pcie-r8a7779", "renesas,pcie-r8a7790", "renesas,pcie-r8a7791"
+- reg: base address and length of the pcie controller registers.
+- #address-cells: set to <3>
+- #size-cells: set to <2>
+- bus-range: PCI bus numbers covered
+- device_type: set to "pci"
+- ranges: ranges for the PCI memory and I/O regions.
+- dma-ranges: ranges for the inbound memory regions.
+- interrupts: two interrupt sources for MSI interrupts, followed by interrupt
+       source for hardware related interrupts (e.g. link speed change).
+- #interrupt-cells: set to <1>
+- interrupt-map-mask and interrupt-map: standard PCI properties
+       to define the mapping of the PCIe interface to interrupt
+       numbers.
+- clocks: from common clock binding: clock specifiers for the PCIe controller
+       and PCIe bus clocks.
+- clock-names: from common clock binding: should be "pcie" and "pcie_bus".
+
+Example:
+
+SoC specific DT Entry:
+
+       pcie: pcie@fe000000 {
+               compatible = "renesas,pcie-r8a7791";
+               reg = <0 0xfe000000 0 0x80000>;
+               #address-cells = <3>;
+               #size-cells = <2>;
+               bus-range = <0x00 0xff>;
+               device_type = "pci";
+               ranges = <0x01000000 0 0x00000000 0 0xfe100000 0 0x00100000
+                         0x02000000 0 0xfe200000 0 0xfe200000 0 0x00200000
+                         0x02000000 0 0x30000000 0 0x30000000 0 0x08000000
+                         0x42000000 0 0x38000000 0 0x38000000 0 0x08000000>;
+               dma-ranges = <0x42000000 0 0x40000000 0 0x40000000 0 0x40000000
+                             0x42000000 2 0x00000000 2 0x00000000 0 0x40000000>;
+               interrupts = <0 116 4>, <0 117 4>, <0 118 4>;
+               #interrupt-cells = <1>;
+               interrupt-map-mask = <0 0 0 0>;
+               interrupt-map = <0 0 0 0 &gic 0 116 4>;
+               clocks = <&mstp3_clks R8A7791_CLK_PCIE>, <&pcie_bus_clk>;
+               clock-names = "pcie", "pcie_bus";
+               status = "disabled";
+       };