pinctrl: make pinctrl_register() return proper error code

pinctrl: make pinctrl_register() return proper error code

Currently, pinctrl_register() just returns NULL on error, so the
callers can not know the exact reason of the failure.

Some of the pinctrl drivers return -EINVAL, some -ENODEV, and some
-ENOMEM on error of pinctrl_register(), although the error code
might be different from the real cause of the error.

This commit reworks pinctrl_register() to return the appropriate
error code and modifies all of the pinctrl drivers to use IS_ERR()
for the error checking and PTR_ERR() for getting the error code.

Signed-off-by: Masahiro Yamada <[email protected]>
Acked-by: Patrice Chotard <[email protected]>
Acked-by: Thierry Reding <[email protected]>
Acked-by: Heiko Stuebner <[email protected]>
Tested-by: Mika Westerberg <[email protected]>
Acked-by: Mika Westerberg <[email protected]>
Acked-by: Lee Jones <[email protected]>
Acked-by: Sören Brinkmann <[email protected]>
Acked-by: Laurent Pinchart <[email protected]>
Acked-by: Ray Jui <[email protected]>
Acked-by: Antoine Tenart <[email protected]>
Acked-by: Hongzhou Yang <[email protected]>
Acked-by: Wei Chen <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>