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

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Message-Id: <20121207131405.EBFDE3E0B87@localhost>
Date:	Fri, 07 Dec 2012 13:14:05 +0000
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Lars-Peter Clausen <lars@...afoo.de>
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: Re: [PATCH resend] spi: Add support for specifying 3-wire mode via device tree

On Thu,  6 Dec 2012 16:55:33 +0100, Lars-Peter Clausen <lars@...afoo.de> wrote:
> 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>

Applied, thanks.

g.

> ---
>  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
> 

-- 
Grant Likely, B.Sc, P.Eng.
Secret Lab Technologies, Ltd.
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