tree 079f75628fa91e1e19807aece7509912cb512b14
parent 365322fb32e82b20758e8a18e3aa94692ce2a3d1
author Silvan Wicki <linux_wi@tinag.ch> 1434618611 +0200
committer Wolfram Sang <wsa@the-dreams.de> 1435082119 +0200

i2c: busses: i2c-bcm2835: limits cdiv to allowed values

Checks if the cdiv value is in between min (0x2) and max (0xFFFE)
supported values by the bcm2835. If not, it returns -ENODEV.

See page 33/34 of BCM2835-ARM-Peripherals.pdf for the DIV register.
https://www.raspberrypi.org/wp-content/uploads/2012/02/BCM2835-ARM-Peripherals.pdf

Signed-off-by: Silvan Wicki <linux_wi@tinag.ch>
[wsa: resolved a merge conflict]
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>