Hello.
On 03/25/2014 07:56 PM, Phil Edworthy wrote:
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@xxxxxxxxxxx>
---
v5:
- Add PCIe bus clock reference
- Add additional interrupt bindings
- Use dma-ranges property to specify inbound memory regions
---
Documentation/devicetree/bindings/pci/rcar-pci.txt | 44 ++++++++++++++++++++++
1 file changed, 44 insertions(+)
create mode 100644 Documentation/devicetree/bindings/pci/rcar-pci.txt
diff --git a/Documentation/devicetree/bindings/pci/rcar-pci.txt b/Documentation/devicetree/bindings/pci/rcar-pci.txt
new file mode 100644
index 0000000..61bf5ef
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/rcar-pci.txt
@@ -0,0 +1,44 @@
+* Renesas RCar PCIe interface
+
+Required properties:
+- compatible: should contain one of the following
+ "renesas,pcie-r8a7779", "renesas,pcie-r8a7790", "renesas,pcie-r8a7791"
+- reg: base addresses and lengths of the pcie controller.
Hmm, need "registers" at end. And why plural?
+- #address-cells: set to <3>
+- #size-cells: set to <2>
+- 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: handle to pci clock.
s/handle/phandle/, s/pci/PCI/.
Actually, it's a clock specifier consisting not only of phandle but also
of clock #. Looking at your example, it's even a pair of clock specifiers.
+- 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>;
+ 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>;
Hmm, this prop looks board-dependent...
+ 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";
+ };
WBR, Sergei
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