[PATCH] spi: add spi_set_drvdata() and spi_get_drvdata()

Add wrappers for getting and setting the driver data using spi_device
instead of using dev_{get|set}_drvdata with &spi->dev, to mirror the
platform_{get|set}_drvdata.

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

Documentation/spi/spi-summary

@@ -312,7 +312,7 @@ might look like this unless you're creating a class_device:
 		chip = kzalloc(sizeof *chip, GFP_KERNEL);
 		if (!chip)
 			return -ENOMEM;
-		dev_set_drvdata(&spi->dev, chip);
+		spi_set_drvdata(spi, chip);
 
 		... etc
 		return 0;

include/linux/spi/spi.h

@@ -114,6 +114,17 @@ static inline void spi_set_ctldata(struct spi_device *spi, void *state)
 	spi->controller_state = state;
 }
 
+/* device driver data */
+
+static inline void spi_set_drvdata(struct spi_device *spi, void *data)
+{
+	dev_set_drvdata(&spi->dev, data);
+}
+
+static inline void *spi_get_drvdata(struct spi_device *spi)
+{
+	return dev_get_drvdata(&spi->dev);
+}
 
 struct spi_message;