From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lars-Peter Clausen Subject: [PATCH resend] spi: Add support for specifying 3-wire mode via device tree Date: Thu, 6 Dec 2012 16:55:33 +0100 Message-ID: <1354809333-18364-1-git-send-email-lars@metafoo.de> Cc: Rob Herring , devicetree-discuss@lists.ozlabs.org, spi-devel-general@lists.sourceforge.net, linux-kernel@vger.kernel.org, Lars-Peter Clausen To: Grant Likely Return-path: Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-spi.vger.kernel.org This patch allows to specify that a SPI device is connected in 3-wire mode via device tree. Signed-off-by: Lars-Peter Clausen Acked-by: Rob Herring --- 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