Re: [PATCH v2] extcon: otg_gpio: add driver for USB OTG port controlled by GPIO(s)

From: Felipe Balbi
Date: Mon Mar 09 2015 - 12:16:52 EST

On Sat, Mar 07, 2015 at 09:06:22PM +0100, Linus Walleij wrote:
> On Fri, Feb 20, 2015 at 8:17 PM, David Cohen
> <david.a.cohen@xxxxxxxxxxxxxxx> wrote:
> > On Fri, Feb 20, 2015 at 10:53:44AM +0100, Linus Walleij wrote:
> >> I would put this adjacent to the phy driver somewhere in drivers/usb/*
> >> and make the actual USB-driver thing handle its GPIOs directly.
> >> But I guess David and Felipe have already discussed that as we're
> >> seeing this patch?
> >
> > - The mux functions would be controlled by a possible new pinctrl-gpio
> > driver (Linus, your input here would be nice :)
> I don't understand what this means, does it mean a pin control function
> somewhere else controlled by a GPIO pin?
> Or do you mean a new combined pin control and GPIO driver (we have
> plenty of these).
> If you elaborate on what you need to do in that driver I might
> understand it better.

there's a discrete mux (not something integrated in the SoC) whose
select signal is tied to a GPIO (in some cases, more than one, but
usually people use 2-state muxes).


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