linux-kernel - [PATCH resend] spi: Add support for specifying 3-wire mode via device tree

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Date:	Thu,  6 Dec 2012 16:55:33 +0100
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Grant Likely <grant.likely@...retlab.ca>
Cc:	Rob Herring <rob.herring@...xeda.com>,
	devicetree-discuss@...ts.ozlabs.org,
	spi-devel-general@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, Lars-Peter Clausen <lars@...afoo.de>
Subject: [PATCH resend] spi: Add support for specifying 3-wire mode via device tree

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@...afoo.de>
Acked-by: Rob Herring <rob.herring@...xeda.com>
---
 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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