tree a8773ecfa4e4f91be9bb41335d8326f78390fedb
parent 3861841d2205714bfabaee4efcbb5e4202884852
author Gao Pan <b54642@freescale.com> 1445603334 +0800
committer Wolfram Sang <wsa@the-dreams.de> 1445630150 +0200

i2c: imx: implement bus recovery

Implement bus recovery methods for i2c-imx so we can recover from
situations where SCL/SDA are stuck low.

Once i2c bus SCL/SDA are stuck low during transfer, config the i2c
pinctrl to gpio mode by calling pinctrl sleep set function, and then
use GPIO to emulate the i2c protocol to send nine dummy clock to recover
i2c device. After recovery, set i2c pinctrl to default group setting.

Signed-off-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: Gao Pan <b54642@freescale.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>