[PATCH] spi: spi-xilinx: Use DT information for bits_per_word value

["Jens Renner (EFE)" <renner-Xf229rFC5gsb1SvskN2V4Q@public.gmane.org>]

From: Jens Renner <renner-Xf229rFC5gsb1SvskN2V4Q@public.gmane.org>

This patch overrides the default value of bits_per_word with the actual value
of "xlnx,num-transfer-bits" from the DTS file to allow for 16 and 32 bit word
lengths.

Signed-off-by: Jens Renner <renner-Xf229rFC5gsb1SvskN2V4Q@public.gmane.org>
---
diff --git a/drivers/spi/spi-xilinx.c b/drivers/spi/spi-xilinx.c
index e1d7696..03abdfa 100644
--- a/drivers/spi/spi-xilinx.c
+++ b/drivers/spi/spi-xilinx.c
@@ -487,6 +487,12 @@ static int xilinx_spi_probe(struct platform_device *dev)
				       &len);
		if (prop && len >= sizeof(*prop))
			num_cs = __be32_to_cpup(prop);
+
+		/* override default number of bits per word */
+		prop = of_get_property(dev->dev.of_node,
+				       "xlnx,num-transfer-bits", &len);
+		if (prop && len >= sizeof(*prop))
+			bits_per_word = __be32_to_cpup(prop);
	}
 #endif

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