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 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. | |||
55 | chip select active high | 55 | chip select active high |
56 | - spi-3wire - (optional) Empty property indicating device requires | 56 | - spi-3wire - (optional) Empty property indicating device requires |
57 | 3-wire mode. | 57 | 3-wire mode. |
58 | - spi-lsb-first - (optional) Empty property indicating device requires | ||
59 | LSB first mode. | ||
58 | - spi-tx-bus-width - (optional) The bus width(number of data wires) that | 60 | - spi-tx-bus-width - (optional) The bus width(number of data wires) that |
59 | used for MOSI. Defaults to 1 if not present. | 61 | used for MOSI. Defaults to 1 if not present. |
60 | - spi-rx-bus-width - (optional) The bus width(number of data wires) that | 62 | - spi-rx-bus-width - (optional) The bus width(number of data wires) that |
61 | used for MISO. Defaults to 1 if not present. | 63 | used for MISO. Defaults to 1 if not present. |
62 | 64 | ||
63 | Some SPI controllers and devices support Dual and Quad SPI transfer mode. | 65 | Some SPI controllers and devices support Dual and Quad SPI transfer mode. |
64 | It allows data in SPI system transfered in 2 wires(DUAL) or 4 wires(QUAD). | 66 | It allows data in the SPI system to be transferred in 2 wires(DUAL) or 4 wires(QUAD). |
65 | Now the value that spi-tx-bus-width and spi-rx-bus-width can receive is | 67 | Now the value that spi-tx-bus-width and spi-rx-bus-width can receive is |
66 | only 1(SINGLE), 2(DUAL) and 4(QUAD). | 68 | only 1(SINGLE), 2(DUAL) and 4(QUAD). |
67 | Dual/Quad mode is not allowed when 3-wire mode is used. | 69 | Dual/Quad mode is not allowed when 3-wire mode is used. |