From: David Cohen <david.a.cohen@linux.intel.com>
To: Linus Walleij <linus.walleij@linaro.org>
Cc: MyungJoo Ham <myungjoo.ham@samsung.com>,
Chanwoo Choi <cw00.choi@samsung.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>,
baolu.lu@linux.intel.com
Subject: Re: [RFC/PATCH] extcon: otg_gpio: add driver for USB OTG port controlled by GPIO(s)
Date: Tue, 17 Feb 2015 11:20:56 -0800 [thread overview]
Message-ID: <20150217192056.GB2957@psi-dev26.jf.intel.com> (raw)
In-Reply-To: <CACRpkdbuFq9_FpzdQ8oWvC9hjy-tAMiFeZEi0C0Xk9W1WRibmg@mail.gmail.com>
Hi Linus,
Thanks for reviewing.
On Thu, Jan 08, 2015 at 08:23:03PM +0100, Linus Walleij wrote:
> On Mon, Dec 22, 2014 at 11:43 PM, David Cohen
> <david.a.cohen@linux.intel.com> wrote:
>
> > Some platforms have an USB OTG port fully (or partially) controlled by
> > GPIOs:
> >
> > (1) USB ID is connected directly to GPIO
> >
> > Optionally:
> > (2) VBUS is enabled by a GPIO (when ID is grounded)
> > (3) Platform has 2 USB controllers connected to same port: one for
> > device and one for host role. D+/- are switched between phys
> > by GPIO.
> >
> > As per initial version, this driver has the duty to control whether
> > USB-Host cable is plugged in or not:
> > - If yes, OTG port is configured for host role
> > - If no, by standard, the OTG port is configured for device role
> >
> > Signed-off-by: David Cohen <david.a.cohen@linux.intel.com>
>
> Pretty interesting! I don't understand the USB stuff so commenting
> from a GPIO side of things only.
>
> > +config EXTCON_OTG_GPIO
> > + tristate "VIRTUAL USB OTG PORT support"
> > + depends on GPIOLIB
>
> Isn't it dependent on ACPI? This was mentioned in the commit message.
Yep, I'll add it :)
>
> > +/*
> > + * Virtual USB OTG Port driver controlled by gpios
> > + *
> > + * Copyright (c) 2014, Intel Corporation.
> > + * Author: David Cohen <david.a.cohen@linux.intel.com>
> > + *
> > + * This program is free software; you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License version 2 as
> > + * published by the Free Software Foundation.
> > + *
> > + * This program is distributed in the hope that it will be useful,
> > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> > + * GNU General Public License for more details.
> > + */
> > +
> > +#include <linux/acpi.h>
> > +#include <linux/extcon.h>
> > +#include <linux/gpio.h>
>
> You should include <linux/gpio/consumer.h>
>
> And nothing else. (I think it'll just work.)
It should work. I'll fix it.
>
> > +static int __init vuport_init(void)
> > +{
> > + return platform_driver_register(&vuport_driver);
> > +}
> > +subsys_initcall(vuport_init);
>
> Usually we try to avoid this kind of early initcalls.
> Doesn't deferred probe work as intended?
Yeah, deferred probe is a better thing to try here.
Br, David
>
> Yours,
> Linus Walleij
next prev parent reply other threads:[~2015-02-17 19:19 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-22 22:43 [RFC/PATCH] extcon: otg_gpio: add driver for USB OTG port controlled by GPIO(s) David Cohen
2014-12-23 1:25 ` Peter Chen
2014-12-23 19:40 ` David Cohen
2014-12-24 3:08 ` Peter Chen
2014-12-24 22:46 ` David Cohen
2014-12-23 13:10 ` Sergei Shtylyov
2014-12-23 19:57 ` David Cohen
2014-12-23 20:09 ` Sergei Shtylyov
2014-12-23 20:43 ` David Cohen
2014-12-24 0:29 ` Felipe Balbi
2014-12-24 22:43 ` David Cohen
2014-12-26 4:49 ` Felipe Balbi
2015-02-17 19:18 ` David Cohen
2015-02-17 19:25 ` Felipe Balbi
2015-02-17 19:35 ` David Cohen
2015-02-18 10:17 ` Mika Westerberg
2015-02-18 17:53 ` David Cohen
2015-01-08 19:23 ` Linus Walleij
2015-02-17 19:20 ` David Cohen [this message]
2015-02-19 19:59 ` [PATCH v2] " David Cohen
2015-02-19 22:39 ` Paul Bolle
2015-02-20 19:02 ` David Cohen
2015-02-20 19:09 ` Felipe Balbi
2015-02-20 19:18 ` David Cohen
2015-02-20 19:10 ` Paul Bolle
2015-02-20 19:18 ` David Cohen
2015-02-20 6:41 ` Robert Baldyga
2015-02-20 9:53 ` Linus Walleij
2015-02-20 19:17 ` David Cohen
2015-02-20 19:36 ` Felipe Balbi
2015-02-20 19:59 ` David Cohen
2015-02-20 20:00 ` Felipe Balbi
2015-02-20 20:40 ` David Cohen
2015-03-07 20:03 ` Linus Walleij
2015-02-24 19:18 ` David Cohen
2015-03-07 20:06 ` Linus Walleij
2015-03-09 16:16 ` Felipe Balbi
2015-03-09 19:10 ` David Cohen
2015-03-16 16:46 ` David Cohen
2015-03-16 16:46 ` David Cohen
2015-03-19 8:18 ` Linus Walleij
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