Add the mbigen msi interrupt controller bindings document
Signed-off-by: Ma Jun <[email protected]> --- Documentation/devicetree/bindings/arm/mbigen.txt | 51 ++++++++++++++++++++++ 1 files changed, 51 insertions(+), 0 deletions(-) create mode 100755 Documentation/devicetree/bindings/arm/mbigen.txt diff --git a/Documentation/devicetree/bindings/arm/mbigen.txt b/Documentation/devicetree/bindings/arm/mbigen.txt new file mode 100755 index 0000000..d442b31 --- /dev/null +++ b/Documentation/devicetree/bindings/arm/mbigen.txt @@ -0,0 +1,51 @@ +Hisilicon mbigen device tree bindings. +======================================= + +Mbigen means: message based interrupt generator. + +MBI is kind of msi interrupt only used on Non-PCI devices. + +To reduce the wired interrupt number connected to GIC, +Hisilicon designed mbigen to collect and generate interrupt. + + +Non-pci devices can connect to mbigen and gnerate the inteerrupt +by wirtting ITS register. + +The mbigen and devices connect to mbigen have the following properties: + + +Mbigen required properties: +------------------------------------------- +-compatible: Should be "hisilicon,mbi-gen" +-msi-parent: should specified the ITS mbigen connected +-interrupt controller: Identifies the node as an interrupt controller +- #interrupt-cells : Specifies the number of cells needed to encode an + interrupt source. The value is 2 for now. +- reg: Specifies the base physical address and size of the ITS + registers. + +Examples: + + mbigen_pa: interrupt-controller@4c030000 { + compatible = "hisilicon,mbi-gen"; + msi-parent = <&its_pa>; + interrupt-controller; + #interrupt-cells = <2>; + reg = <0x4c030000 0x10000>; + }; + +Device connect to mbigen required properties: +---------------------------------------------------- +-interrupt-parent: Specifies the mbigen node which device connected. +-interrupts:specifies the interrupt source.The first cell is hwirq num, the + second number is trigger type. + +Examples: + usb0: ehci@a1000000 { + compatible = "generic-ehci"; + interrupt-parent = <&mbigen_pa>; + reg = <0xa1000000 0x10000>; + interrupts = <20 4>; + }; + -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
