[PATCH resend] spi: Add support for specifying 3-wire mode via device tree
From: Lars-Peter Clausen
Date: Thu Dec 06 2012 - 10:55:40 EST
This patch allows to specify that a SPI device is connected in 3-wire mode via
device tree.
Signed-off-by: Lars-Peter Clausen <lars@xxxxxxxxxx>
Acked-by: Rob Herring <rob.herring@xxxxxxxxxxx>
---
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 77a8b0d..296015e 100644
--- a/Documentation/devicetree/bindings/spi/spi-bus.txt
+++ b/Documentation/devicetree/bindings/spi/spi-bus.txt
@@ -53,6 +53,8 @@ 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.
If a gpio chipselect is used for the SPI slave the gpio number will be passed
via the cs_gpio
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 22c71e2..cb61ada 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -861,6 +861,8 @@ 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);
--
1.8.0
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