linux-kernel - [PATCH] SPI: Set SPI bits per words in an OF DeviceTree SPI node

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Message-Id: <201308071544.r77Fij2Y006649@localhost.localdomain>
Date:	Wed, 7 Aug 2013 17:44:45 +0200
From:	Christophe Leroy <christophe.leroy@....fr>
To:	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>
CC:	spi-devel-general@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	stigge@...com.de
Subject: [PATCH] SPI: Set SPI bits per words in an OF DeviceTree SPI node

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@....fr>

--- 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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