This patch allows to specify that a SPI device is connected in 3-wire mode via the device tree.
Signed-off-by: Lars-Peter Clausen <[email protected]> --- Documentation/devicetree/bindings/spi/spi-bus.txt | 2 ++ drivers/spi/spi.c | 2 ++ 2 files changed, 4 insertions(+) diff --git a/Documentation/devicetree/bindings/spi/spi-bus.txt b/Documentation/devicetree/bindings/spi/spi-bus.txt index e782add..46f2f3b 100644 --- a/Documentation/devicetree/bindings/spi/spi-bus.txt +++ b/Documentation/devicetree/bindings/spi/spi-bus.txt @@ -33,6 +33,8 @@ contain the following properties. shifted clock phase (CPHA) mode - spi-cs-high - (optional) Empty property indicating device requires chip select active high +- spi-3wire - (optional) Empty property indicating device requires + 3-wire mode. SPI example for an MPC5200 SPI bus: spi@f00 { diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index fc0da39..09da7de 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -856,6 +856,8 @@ static void of_register_spi_devices(struct spi_master *master) spi->mode |= SPI_CPOL; if (of_find_property(nc, "spi-cs-high", NULL)) spi->mode |= SPI_CS_HIGH; + if (of_find_property(nc, "spi-3wire", NULL)) + spi->mode |= SPI_3WIRE; /* Device speed */ prop = of_get_property(nc, "spi-max-frequency", &len); -- 1.7.10.4 _______________________________________________ devicetree-discuss mailing list [email protected] https://lists.ozlabs.org/listinfo/devicetree-discuss
