spi_s3c24xx: pin configuration updates

Add a pin configuration callback for the s3c24xx SPI driver, as there are
several options depending on the channel and the chip in use.

This is needed as the controller may not have been setup by the initial
bootloader and the fact that the SPI controller gets reset over
suspend/resume into slave mode but the GPIO function registers do not.
Signed-off-by: NBen Dooks <ben-linux@fluff.org>
Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

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

@@ -18,6 +18,7 @@ struct s3c2410_spi_info {
 	unsigned int		 num_cs;	/* total chipselects */
 	int			 bus_num;       /* bus number to use. */
 
+	void (*gpio_setup)(struct s3c2410_spi_info *spi, int enable);
 	void (*set_cs)(struct s3c2410_spi_info *spi, int cs, int pol);
 };
 

drivers/spi/spi_s3c24xx.c

@@ -247,6 +247,9 @@ static void s3c24xx_spi_initialsetup(struct s3c24xx_spi *hw)
 	writeb(0xff, hw->regs + S3C2410_SPPRE);
 	writeb(SPPIN_DEFAULT, hw->regs + S3C2410_SPPIN);
 	writeb(SPCON_DEFAULT, hw->regs + S3C2410_SPCON);
+
+	if (hw->pdata && hw->pdata->gpio_setup)
+		hw->pdata->gpio_setup(hw->pdata, 1);
 }
 
 static int __init s3c24xx_spi_probe(struct platform_device *pdev)
@@ -412,6 +415,9 @@ static int s3c24xx_spi_suspend(struct platform_device *pdev, pm_message_t msg)
 {
 	struct s3c24xx_spi *hw = platform_get_drvdata(pdev);
 
+	if (hw->pdata && hw->pdata->gpio_setup)
+		hw->pdata->gpio_setup(hw->pdata, 0);
+
 	clk_disable(hw->clk);
 	return 0;
 }