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Documentation/devicetree: document OCTEON USB bindings
Document device-tree bindings for the USB controller on older
OCTEON SOCs (OCTEON, OCTEON+).
Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Rob Herring <robh@kernel.org>
authored by
Aaro Koskinen
and committed by
Rob Herring
8cc73e58
2729f62c
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Documentation/devicetree/bindings/usb/octeon-usb.txt
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Documentation/devicetree/bindings/usb/octeon-usb.txt
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OCTEON/OCTEON+ USB BLOCK
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1) Main node
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Required properties:
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- compatible: must be "cavium,octeon-5750-usbn"
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- reg: specifies the physical base address of the USBN block and
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the length of the memory mapped region.
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- #address-cells: specifies the number of cells needed to encode an
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address. The value must be 2.
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- #size-cells: specifies the number of cells used to represent the size
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of an address. The value must be 2.
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- ranges: specifies the translation between child address space and parent
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address space.
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- clock-frequency: speed of the USB reference clock. Allowed values are
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12000000, 24000000 or 48000000.
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- cavium,refclk-type: type of the USB reference clock. Allowed values are
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"crystal" or "external".
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- refclk-frequency: deprecated, use "clock-frequency".
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- refclk-type: deprecated, use "cavium,refclk-type".
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2) Child node
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The main node must have one child node which describes the built-in
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USB controller.
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Required properties:
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- compatible: must be "cavium,octeon-5750-usbc"
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- reg: specifies the physical base address of the USBC block and
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the length of the memory mapped region.
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- interrupts: specifies the interrupt number for the USB controller.
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3) Example:
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usbn: usbn@1180068000000 {
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compatible = "cavium,octeon-5750-usbn";
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reg = <0x11800 0x68000000 0x0 0x1000>;
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ranges; /* Direct mapping */
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#address-cells = <2>;
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#size-cells = <2>;
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clock-frequency = <12000000>;
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cavium,refclk-type = "crystal";
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usbc@16f0010000000 {
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compatible = "cavium,octeon-5750-usbc";
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reg = <0x16f00 0x10000000 0x0 0x80000>;
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interrupts = <0 56>;
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};
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};
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