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    SubjectRe: [PATCH 0/4 v4] pin controller subsystem v4
    > - 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
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