Re: linux-next: build failure after merge of the gpio tree

On Wed, Feb 8, 2017 at 6:11 AM, Stephen Rothwell [off-list ref] wrote:

Hi Linus,

After merging the gpio tree, today's linux-next build (arm
multi_v7_defconfig) failed like this:

drivers/tty/serial/st-asc.c: In function 'asc_set_termios':
drivers/tty/serial/st-asc.c:578:12: error: implicit declaration of function 'devm_get_gpiod_from_child' [-Werror=implicit-function-declaration]
    gpiod = devm_get_gpiod_from_child(port->dev, "rts",
            ^
drivers/tty/serial/st-asc.c:578:10: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
    gpiod = devm_get_gpiod_from_child(port->dev, "rts",
          ^

Caused by commits

  a264d10ff45c ("gpiolib: Convert fwnode_get_named_gpiod() to configure GPIO")
  b2987d7438e0 ("gpio: Pass GPIO label down to gpiod_request")
  4b0947974e59 ("gpio: Rename devm_get_gpiod_from_child()")

interacting with commit

  d7356256488c ("serial: st-asc: (De)Register GPIOD and swap Pinctrl profiles")

from the tty tree.

Ah what a bummer, a new user colliding with the treewide changes of these
prototypes.

I applied the following merge fix patch (I guessed about the new arguments):

Looks correct. Well not much to do about it apart from mentioning the
problem to Linus (the big penguin) when merging the trees.

Thanks for your efforts!

Yours,
Linus Walleij