spi: spi_s3c24xx must initialize num_chipselect

The SPI core now expects num_chipselect to be set correctly as due to added
checks on the chip being selected before an transfer is allowed.  This patch
adds a num_cs field to the platform data which needs to be set correctly
before adding the SPI platform device.
Signed-off-by: NBen Dooks <ben-linux@fluff.org>
Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/spi/spi_s3c24xx.c

@@ -267,6 +267,10 @@ static int __init s3c24xx_spi_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, hw);
 	init_completion(&hw->done);
 
+	/* setup the master state. */
+
+	master->num_chipselect = hw->pdata->num_cs;
+
 	/* setup the state for the bitbang driver */
 
 	hw->bitbang.master         = hw->master;

include/asm-arm/arch-s3c2410/spi.h

@@ -15,6 +15,7 @@
 
 struct s3c2410_spi_info {
 	unsigned long		 pin_cs;	/* simple gpio cs */
+	unsigned int		 num_cs;	/* total chipselects */
 
 	void (*set_cs)(struct s3c2410_spi_info *spi, int cs, int pol);
 };