From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Javier Arteaga <javier@emutex.com>
Cc: Jacek Anaszewski <jacek.anaszewski@gmail.com>,
Pavel Machek <pavel@ucw.cz>, "Dan O'Donovan" <dan@emutex.com>,
Mika Westerberg <mika.westerberg@linux.intel.com>,
Heikki Krogerus <heikki.krogerus@linux.intel.com>,
Lee Jones <lee.jones@linaro.org>,
Linus Walleij <linus.walleij@linaro.org>,
linux-gpio@vger.kernel.org, linux-leds@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH RESEND 2/3] leds: upboard: Add LED support
Date: Wed, 02 May 2018 16:55:17 +0300 [thread overview]
Message-ID: <1525269317.21176.625.camel@linux.intel.com> (raw)
In-Reply-To: <20180426124922.haddppocljgnj2ei@localhost>
On Thu, 2018-04-26 at 13:49 +0100, Javier Arteaga wrote:
> On Thu, Apr 26, 2018 at 10:55:49AM +0300, Andy Shevchenko wrote:
> > On Thu, 2018-04-26 at 03:34 +0100, Javier Arteaga wrote:
> > > My understanding was that in this context, __init allows this
> > > probe()
> > > to
> > > be dropped from memory after module load.
> > >
> > > What am I doing wrong there?
> >
> > Just give another thought about it. The keyword(s) here is(are):
> > time to
> > live of the objects in question. It's good to get knowing what
> > unbind-
> > bind means (for built-in drivers).
>
> So this is the bit that I _believed_ applied to the platform drivers
> for
> these MFD-registered devices (from driver-model/platform.txt):
>
> Or, in common situations where the device is known not to be hot-
> pluggable,
> the probe() routine can live in an init section to reduce the
> driver's
> runtime memory footprint:
>
> int platform_driver_probe(struct platform_driver *drv,
> int (*probe)(struct platform_device *))
>
> I'm thinking my misunderstanding probably stems from assuming that
> these
> leds/pinctrl drivers will always find all devices registered at init
> time. Can't say I've validated that assumption - I just didn't see
> anything obviously blowing up in my tests so far :)
>
> I'll keep reading and test out a few more things so I fully
> understand.
> Until then, I've taken out __init annotations from next version.
Just do one small test. Try to unbind the (built-in) driver and bind it
back. Would it work? Would kernel survive this?
--
Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Intel Finland Oy
next prev parent reply other threads:[~2018-05-02 13:55 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-21 8:50 [RFC PATCH RESEND 0/3] UP Squared board drivers Javier Arteaga
2018-04-21 8:50 ` [RFC PATCH RESEND 1/3] mfd: upboard: Add UP2 platform controller driver Javier Arteaga
2018-04-25 9:51 ` Mika Westerberg
2018-04-25 12:05 ` Javier Arteaga
2018-04-25 15:57 ` Andy Shevchenko
2018-04-26 2:33 ` Javier Arteaga
2018-04-21 8:50 ` [RFC PATCH RESEND 2/3] leds: upboard: Add LED support Javier Arteaga
2018-04-25 6:41 ` Pavel Machek
2018-04-25 7:02 ` Javier Arteaga
2018-04-25 7:04 ` Pavel Machek
2018-04-25 16:15 ` Andy Shevchenko
2018-04-26 2:34 ` Javier Arteaga
2018-04-26 7:55 ` Andy Shevchenko
2018-04-26 12:49 ` Javier Arteaga
2018-05-02 13:55 ` Andy Shevchenko [this message]
2018-04-26 7:34 ` Lee Jones
2018-04-26 13:03 ` Javier Arteaga
2018-04-27 7:38 ` Lee Jones
2018-04-21 8:50 ` [RFC PATCH RESEND 3/3] pinctrl: upboard: Add UP2 pinctrl and gpio driver Javier Arteaga
2018-04-25 16:49 ` Andy Shevchenko
2018-04-26 2:38 ` Javier Arteaga
2018-04-26 6:50 ` Lee Jones
2018-04-26 13:36 ` Javier Arteaga
2018-04-25 9:53 ` [RFC PATCH RESEND 0/3] UP Squared board drivers Mika Westerberg
2018-10-19 17:15 ` [PATCH v2 " Dan O'Donovan
2018-10-19 17:15 ` [PATCH v2 1/3] mfd: upboard: Add UP2 platform controller driver Dan O'Donovan
2018-10-20 11:49 ` Andy Shevchenko
2018-10-25 11:05 ` Lee Jones
2018-10-25 13:15 ` Andy Shevchenko
2018-10-31 20:40 ` Dan O'Donovan
2018-10-19 17:15 ` [PATCH v2 2/3] leds: upboard: Add LED support Dan O'Donovan
2018-10-20 11:17 ` Andy Shevchenko
2018-10-21 8:31 ` Pavel Machek
2018-10-23 18:50 ` Jacek Anaszewski
2018-10-23 18:54 ` Pavel Machek
2018-10-23 19:09 ` Jacek Anaszewski
2018-10-23 19:30 ` Pavel Machek
2018-10-24 20:07 ` Jacek Anaszewski
2018-10-25 9:22 ` Andy Shevchenko
2018-10-25 17:44 ` Jacek Anaszewski
2018-10-23 19:23 ` Joe Perches
2018-10-23 20:31 ` Jacek Anaszewski
2018-10-24 10:13 ` Andy Shevchenko
2018-10-24 10:24 ` Joe Perches
2018-10-19 17:15 ` [PATCH v2 3/3] pinctrl: upboard: Add UP2 pinctrl and gpio driver Dan O'Donovan
2018-10-20 11:40 ` Andy Shevchenko
2018-10-31 19:55 ` Dan O'Donovan
2018-10-22 9:07 ` Linus Walleij
2018-10-24 13:05 ` [PATCH v2 0/3] UP Squared board drivers Andy Shevchenko
2018-10-31 20:44 ` [PATCH v3 " Dan O'Donovan
2018-10-31 20:44 ` [PATCH v3 1/3] mfd: upboard: Add UP2 platform controller driver Dan O'Donovan
2018-11-01 8:07 ` Lee Jones
2018-11-01 9:58 ` Dan O'Donovan
2018-11-11 11:29 ` Pavel Machek
2018-11-15 14:56 ` Linus Walleij
2018-10-31 20:44 ` [PATCH v3 2/3] leds: upboard: Add LED support Dan O'Donovan
2018-10-31 20:44 ` [PATCH v3 3/3] pinctrl: upboard: Add UP2 pinctrl and gpio driver Dan O'Donovan
2018-10-31 21:30 ` Linus Walleij
2018-10-31 21:39 ` Dan O'Donovan
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