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-rw-r--r--Documentation/devicetree/bindings/spi/spi-bus.txt4
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 e5a4d1b4acfe..bbaa857dd68f 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.