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Diffstat (limited to 'Documentation/devicetree/bindings/pci/designware-pcie.txt')
| -rw-r--r-- | Documentation/devicetree/bindings/pci/designware-pcie.txt | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/pci/designware-pcie.txt b/Documentation/devicetree/bindings/pci/designware-pcie.txt new file mode 100644 index 000000000000..e2371f5cdebe --- /dev/null +++ b/Documentation/devicetree/bindings/pci/designware-pcie.txt @@ -0,0 +1,73 @@ +* Synopsis Designware PCIe interface + +Required properties: +- compatible: should contain "snps,dw-pcie" to identify the + core, plus an identifier for the specific instance, such + as "samsung,exynos5440-pcie". +- reg: base addresses and lengths of the pcie controller, + the phy controller, additional register for the phy controller. +- interrupts: interrupt values for level interrupt, + pulse interrupt, special interrupt. +- clocks: from common clock binding: handle to pci clock. +- clock-names: from common clock binding: should be "pcie" and "pcie_bus". +- #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 +- #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. +- reset-gpio: gpio pin number of power good signal + +Example: + +SoC specific DT Entry: + + pcie@290000 { + compatible = "samsung,exynos5440-pcie", "snps,dw-pcie"; + reg = <0x290000 0x1000 + 0x270000 0x1000 + 0x271000 0x40>; + interrupts = <0 20 0>, <0 21 0>, <0 22 0>; + clocks = <&clock 28>, <&clock 27>; + clock-names = "pcie", "pcie_bus"; + #address-cells = <3>; + #size-cells = <2>; + device_type = "pci"; + ranges = <0x00000800 0 0x40000000 0x40000000 0 0x00001000 /* configuration space */ + 0x81000000 0 0 0x40001000 0 0x00010000 /* downstream I/O */ + 0x82000000 0 0x40011000 0x40011000 0 0x1ffef000>; /* non-prefetchable memory */ + #interrupt-cells = <1>; + interrupt-map-mask = <0 0 0 0>; + interrupt-map = <0x0 0 &gic 53>; + }; + + pcie@2a0000 { + compatible = "samsung,exynos5440-pcie", "snps,dw-pcie"; + reg = <0x2a0000 0x1000 + 0x272000 0x1000 + 0x271040 0x40>; + interrupts = <0 23 0>, <0 24 0>, <0 25 0>; + clocks = <&clock 29>, <&clock 27>; + clock-names = "pcie", "pcie_bus"; + #address-cells = <3>; + #size-cells = <2>; + device_type = "pci"; + ranges = <0x00000800 0 0x60000000 0x60000000 0 0x00001000 /* configuration space */ + 0x81000000 0 0 0x60001000 0 0x00010000 /* downstream I/O */ + 0x82000000 0 0x60011000 0x60011000 0 0x1ffef000>; /* non-prefetchable memory */ + #interrupt-cells = <1>; + interrupt-map-mask = <0 0 0 0>; + interrupt-map = <0x0 0 &gic 56>; + }; + +Board specific DT Entry: + + pcie@290000 { + reset-gpio = <&pin_ctrl 5 0>; + }; + + pcie@2a0000 { + reset-gpio = <&pin_ctrl 22 0>; + }; |