[PATCH 0/4 v4] pin controller subsystem v4

[Barry Song]

> - Rewrite the interaction with the GPIO subsystem - the pin
>  controller descriptor now handles this by defining an offset
>  into the GPIO numberspace for its handled pin range. This is
>  used to look up the apropriate pin controller for a GPIO pin.
>  Then that specific GPIO range is matched 1-1 for the target
>  controller instance.
...
>
> Linus Walleij (4):
>  drivers: create a pinmux subsystem v4
>  pinmux: add a driver for the U300 pinmux
>  amba: request muxing for PrimeCell devices
>  mach-u300: activate pinmux driver, delete old padmux driver

it seems there is not an actual example that gpio requests pin from
pinctrl yet. i might give one on SiRFprimaII.

Thanks
Barry