On Aug 7, 2013, at 10:54 AM, leroy christophe wrote:
> Sujet: [PATCH] SPI: Set SPI bits per words in an OF DeviceTree SPI node
> Date : Wed, 7 Aug 2013 17:44:45 +0200
> De : Christophe Leroy <christophe.leroy@xxxxxx>
> Pour : Grant Likely <grant.likely@xxxxxxxxxxxx>, Rob Herring <rob.herring@xxxxxxxxxxx>
> Copie à : spi-devel-general@xxxxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, devicetree-discuss@xxxxxxxxxxxxxxxx, stigge@xxxxxxxxx
>
>
>
> This patch allows to set up the bits per word together with all other SPI
> parameters in the SPI Node of the OF device tree
>
> In the node, you then have to include the 'spi-bits' property.
>
> Exemple:
> fpga-loader@7 {
> compatible = "cs,fpga-loader";
> spi-max-frequency = <10000000>;
> reg = <7>;
> spi-cs-high;
> spi-bits = <16>;
> };
>
> Signed-off-by: Christophe Leroy <christophe.leroy@xxxxxx>
Is there an associated device tree binding spec update? If not there should be.
- k
>
> --- linux-3.8.13/drivers/spi/spi.c 2013-05-11 22:57:46.000000000 +0200
> +++ linux/drivers/spi/spi.c 2013-08-06 18:19:30.000000000 +0200
> @@ -870,6 +870,11 @@
> if (of_find_property(nc, "spi-3wire", NULL))
> spi->mode |= SPI_3WIRE;
> + /* Bits per word */
> + prop = of_get_property(nc, "spi-bits", &len);
> + if (prop && len >= sizeof(*prop))
> + spi->bits_per_word = prop[0];
> +
> /* Device speed */
> prop = of_get_property(nc, "spi-max-frequency", &len);
> if (!prop || len < sizeof(*prop)) {
>
>
>
>
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