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

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Message-ID: <20150309161608.GF3739@saruman.tx.rr.com>
Date:	Mon, 9 Mar 2015 11:16:08 -0500
From:	Felipe Balbi <balbi@...com>
To:	Linus Walleij <linus.walleij@...aro.org>
CC:	David Cohen <david.a.cohen@...ux.intel.com>,
	Robert Baldyga <r.baldyga@...sung.com>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	MyungJoo Ham <myungjoo.ham@...sung.com>,
	Chanwoo Choi <cw00.choi@...sung.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	<baolu.lu@...ux.intel.com>, Felipe Balbi <balbi@...com>
Subject: Re: [PATCH v2] extcon: otg_gpio: add driver for USB OTG port
 controlled by GPIO(s)

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@...ux.intel.com> 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).

-- 
balbi

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