diff options
Diffstat (limited to 'Documentation/devicetree/bindings/spi/spi-bus.txt')
| -rw-r--r-- | Documentation/devicetree/bindings/spi/spi-bus.txt | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/Documentation/devicetree/bindings/spi/spi-bus.txt b/Documentation/devicetree/bindings/spi/spi-bus.txt index e5a4d1b4acf..bbaa857dd68 100644 --- a/Documentation/devicetree/bindings/spi/spi-bus.txt +++ b/Documentation/devicetree/bindings/spi/spi-bus.txt @@ -55,13 +55,15 @@ contain the following properties. chip select active high - spi-3wire - (optional) Empty property indicating device requires 3-wire mode. +- spi-lsb-first - (optional) Empty property indicating device requires + LSB first mode. - spi-tx-bus-width - (optional) The bus width(number of data wires) that used for MOSI. Defaults to 1 if not present. - spi-rx-bus-width - (optional) The bus width(number of data wires) that used for MISO. Defaults to 1 if not present. Some SPI controllers and devices support Dual and Quad SPI transfer mode. -It allows data in SPI system transfered in 2 wires(DUAL) or 4 wires(QUAD). +It allows data in the SPI system to be transferred in 2 wires(DUAL) or 4 wires(QUAD). Now the value that spi-tx-bus-width and spi-rx-bus-width can receive is only 1(SINGLE), 2(DUAL) and 4(QUAD). Dual/Quad mode is not allowed when 3-wire mode is used. |