are <khali@linux-fr.org> 1275557633 +0200

i2c: Document reserved I2C addresses

Move strict I2C address validity check to a single function, and
document the reserved I2C addresses there.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Hans Verkuil <hverkuil@xs4all.nl>
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