tree 76a5ed1433cbe409d20b49f72e508c0caa552c69
parent 5a3a3a48353fbb9ee988364c8d7b7f09a07f699b
author Stefan Roese <sr@denx.de> 1461219578 +0200
committer Heiko Schocher <hs@denx.de> 1461562276 +0200

i2c: designware_i2c: Add dw_i2c_enable() helper function

dw_i2c_enable() is used to dis-/en-able the I2C controller. It makes
sense to add such a function, as the controller is dis-/en-abled
multiple times in the code. Additionally, this function now checks,
if the controller is really dis-/en-abled. This code is copied
from the Linux I2C driver version.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Simon Glass <sjg@chromium.org>
Cc: Bin Meng <bmeng.cn@gmail.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Heiko Schocher <hs@denx.de>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>