tree 343e82c48a69093828baf52a82400e780ae9114a
parent 0fefcb6876d0d650ac2255c57051b31c48c1b165
author Markus Pargmann <mpa@pengutronix.de> 1427210778 +0100
committer Linus Walleij <linus.walleij@linaro.org> 1428412260 +0200

pinctrl: fsl: imx: Check for 0 config register

0 is used in all pinfunction definitions when a config register is not
available, for example imx25-pinfunc.h. If a configuration value is used
for such a pinfunction the driver will always write it to the
configuration register if it is not -1. For a 0 configuration register
the configuration value is written to offset 0x0. This can lead to a
crashing/hanging system without any warning message.

This patch checks for 0 config register and sets the internal value to
-1. If the configuration value is not NO_PADCTL this leads to an error
message that applying the configuration failed.

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Tested-by: Stefan Agner <stefan@agner.ch>
Acked-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>