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spi: add "spi-lsb-first" to devicetree

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add optional property devicetree for SPI slave nodes
into devicetree so that LSB mode can be enabled by devicetree.

Signed-off-by: Zhao Qiang <B45475@freescale.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Zhao Qiang
2014-04-01 17:10:50 +08:00
committed by Mark Brown
parent c9eaa447e7
commit cd6339e6ce
2 changed files with 4 additions and 0 deletions
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2
Documentation/devicetree/bindings/spi/spi-bus.txt
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@@ -55,6 +55,8 @@ contain the following properties.
chip select active high chip select active high
- spi-3wire - (optional) Empty property indicating device requires - spi-3wire - (optional) Empty property indicating device requires
3-wire mode. 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 - spi-tx-bus-width - (optional) The bus width(number of data wires) that
used for MOSI. Defaults to 1 if not present. used for MOSI. Defaults to 1 if not present.
- spi-rx-bus-width - (optional) The bus width(number of data wires) that - spi-rx-bus-width - (optional) The bus width(number of data wires) that

2
drivers/spi/spi.c
View File

@@ -1234,6 +1234,8 @@ static void of_register_spi_devices(struct spi_master *master)
spi->mode |= SPI_CS_HIGH; spi->mode |= SPI_CS_HIGH;
if (of_find_property(nc, "spi-3wire", NULL)) if (of_find_property(nc, "spi-3wire", NULL))
spi->mode |= SPI_3WIRE; spi->mode |= SPI_3WIRE;
if (of_find_property(nc, "spi-lsb-first", NULL))
spi->mode |= SPI_LSB_FIRST;
/* Device DUAL/QUAD mode */ /* Device DUAL/QUAD mode */
if (!of_property_read_u32(nc, "spi-tx-bus-width", &value)) { if (!of_property_read_u32(nc, "spi-tx-bus-width", &value)) {