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devicetree: Add ARM pl022 spi controller binding doc
Add binding documentation for ARM's Primecell PL022 SPI controller.
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
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Documentation/devicetree/bindings/spi/spi_pl022.txt
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Documentation/devicetree/bindings/spi/spi_pl022.txt
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ARM PL022 SPI controller
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Required properties:
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- compatible : "arm,pl022", "arm,primecell"
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- reg : Offset and length of the register set for the device
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- interrupts : Should contain SPI controller interrupt
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Optional properties:
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- cs-gpios : should specify GPIOs used for chipselects.
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The gpios will be referred to as reg = <index> in the SPI child nodes.
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If unspecified, a single SPI device without a chip select can be used.
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