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: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 5 insertions, 0 deletions

diff --git a/drivers/spi/spi_s3c24xx.c b/drivers/spi/spi_s3c24xx.c
index 80719ef54365..b7476b888197 100644
--- a/drivers/spi/spi_s3c24xx.c
+++ b/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;
diff --git a/include/asm-arm/arch-s3c2410/spi.h b/include/asm-arm/arch-s3c2410/spi.h
index 7ca0ed97a6d0..352d33860b63 100644
--- a/include/asm-arm/arch-s3c2410/spi.h
+++ b/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);
 };