i2c-dev: Clarify the unit of ioctl I2C_TIMEOUT

The unit in which user-space can set the bus timeout value is jiffies
for historical reasons (back when HZ was always 100.) This is however
not good because user-space doesn't know how long a jiffy lasts. The
timeout value should instead be set in a fixed time unit. Given the
original value of HZ, this unit should be 10 ms, for compatibility.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Wolfram Sang <w.sang@pengutronix.de>

include/linux/i2c.h

diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index fcfbfea..c86c3b0 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -361,7 +361,7 @@
 	struct mutex bus_lock;
 	struct mutex clist_lock;
 
-	int timeout;
+	int timeout;			/* in jiffies */
 	int retries;
 	struct device dev;		/* the adapter device */