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spi: pl022: Document property values 

The property "pl022,com-mode" can only assume one of the values of
the enum ssp_mode, defined in include/linux/amba/pl022.h
List the possible numeric values and report the associated meaning.

Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Antonio Borneo 2017-03-20 10:59:59 +01:00 committed by Mark Brown
parent e6a72e057f
commit 3c85871a8a
1 changed files with 4 additions and 1 deletions
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5
Documentation/devicetree/bindings/spi/spi_pl022.txt
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@ -30,7 +30,10 @@ contain the following properties.
0: SPI
1: Texas Instruments Synchronous Serial Frame Format
2: Microwire (Half Duplex)
- pl022,com-mode : polling, interrupt or dma
- pl022,com-mode : specifies the transfer mode:
0: interrupt mode
1: polling mode (default mode if property not present)
2: DMA mode
- pl022,rx-level-trig : Rx FIFO watermark level
- pl022,tx-level-trig : Tx FIFO watermark level
- pl022,ctrl-len : Microwire interface: Control length