From: Maxime Ripard <maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
To: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Alexandre Belloni
<alexandre.belloni-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
Subject: Re: [PATCH] spi: Force the registration of the spidev devices
Date: Wed, 30 Apr 2014 11:06:09 -0700 [thread overview]
Message-ID: <20140430180609.GC3000@lukather> (raw)
In-Reply-To: <20140429183758.GH15125-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
[-- Attachment #1: Type: text/plain, Size: 927 bytes --]
Hi Mark
On Tue, Apr 29, 2014 at 11:37:58AM -0700, Mark Brown wrote:
> On Mon, Apr 28, 2014 at 10:22:54AM -0700, Maxime Ripard wrote:
>
> > spidev device registration has always been a controversial subject
> > since the move to DT.
>
> Why can we not handle this by using sysfs to bind spidev to the
> device?
I just tried it, and apparently, you can't really use this, since spi
devices are created from the device tree (or ACPI) whenever the master
registers.
As such, you still need a DT node for every spidev device you might
want to use.
It doesn't really work either for a device that would be bound to a
driver, that you unbind, and then try to bind to spidev instead. It
looks like the device is released whenever you unbind it, so you can't
really use it afterwards.
Maxime
--
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 836 bytes --]
WARNING: multiple messages have this Message-ID (diff)
From: Maxime Ripard <maxime.ripard@free-electrons.com>
To: Mark Brown <broonie@kernel.org>
Cc: linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org,
Alexandre Belloni <alexandre.belloni@free-electrons.com>
Subject: Re: [PATCH] spi: Force the registration of the spidev devices
Date: Wed, 30 Apr 2014 11:06:09 -0700 [thread overview]
Message-ID: <20140430180609.GC3000@lukather> (raw)
In-Reply-To: <20140429183758.GH15125@sirena.org.uk>
[-- Attachment #1: Type: text/plain, Size: 927 bytes --]
Hi Mark
On Tue, Apr 29, 2014 at 11:37:58AM -0700, Mark Brown wrote:
> On Mon, Apr 28, 2014 at 10:22:54AM -0700, Maxime Ripard wrote:
>
> > spidev device registration has always been a controversial subject
> > since the move to DT.
>
> Why can we not handle this by using sysfs to bind spidev to the
> device?
I just tried it, and apparently, you can't really use this, since spi
devices are created from the device tree (or ACPI) whenever the master
registers.
As such, you still need a DT node for every spidev device you might
want to use.
It doesn't really work either for a device that would be bound to a
driver, that you unbind, and then try to bind to spidev instead. It
looks like the device is released whenever you unbind it, so you can't
really use it afterwards.
Maxime
--
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 836 bytes --]
next prev parent reply other threads:[~2014-04-30 18:06 UTC|newest]
Thread overview: 86+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-28 17:22 [PATCH] spi: Force the registration of the spidev devices Maxime Ripard
2014-04-28 17:22 ` Maxime Ripard
[not found] ` <1398705774-12361-1-git-send-email-maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
2014-04-29 18:37 ` Mark Brown
2014-04-29 18:37 ` Mark Brown
[not found] ` <20140429183758.GH15125-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2014-04-29 21:31 ` Martin Sperl
[not found] ` <24BF05CB-35FF-42E8-BE5C-A5E4E3D0C52A-TqfNSX0MhmxHKSADF0wUEw@public.gmane.org>
2014-04-30 18:14 ` Maxime Ripard
2014-04-30 20:00 ` Martin Sperl
[not found] ` <DA3907EB-0C1B-42FB-B288-9E33F6E24E3E-TqfNSX0MhmxHKSADF0wUEw@public.gmane.org>
2014-04-30 22:19 ` Maxime Ripard
2014-05-01 1:21 ` Mark Brown
2014-04-30 18:06 ` Maxime Ripard [this message]
2014-04-30 18:06 ` Maxime Ripard
2014-05-01 1:18 ` Mark Brown
2014-05-01 1:18 ` Mark Brown
[not found] ` <20140501011811.GF3245-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2014-05-01 22:36 ` Maxime Ripard
2014-05-01 22:36 ` Maxime Ripard
2014-05-01 23:28 ` Geert Uytterhoeven
[not found] ` <CAMuHMdUWa1_n94sDvv=L_goc+SOnD9CAKi5DzifrY7GWYRdQmw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-05-02 16:55 ` Mark Brown
2014-05-02 16:55 ` Mark Brown
2014-05-05 4:17 ` Maxime Ripard
2014-05-05 7:10 ` Geert Uytterhoeven
[not found] ` <CAMuHMdWZ1rvC+tkT=CbfMwZtppyJ_KpzT7JrLd5k5P2oxzA+8g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-05-05 13:57 ` Alexandre Belloni
2014-05-05 13:57 ` Alexandre Belloni
[not found] ` <20140505135701.GA21940-m++hUPXGwpdeoWH0uzbU5w@public.gmane.org>
2014-05-05 14:22 ` Geert Uytterhoeven
2014-05-05 14:22 ` Geert Uytterhoeven
2014-05-05 19:16 ` Mark Brown
2014-05-02 17:40 ` Mark Brown
2014-05-02 17:40 ` Mark Brown
2014-05-05 4:21 ` Maxime Ripard
2014-05-05 19:17 ` Mark Brown
2014-05-05 19:17 ` Mark Brown
[not found] ` <20140505191723.GK22111-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2014-05-08 2:22 ` Maxime Ripard
2014-05-08 2:22 ` Maxime Ripard
-- strict thread matches above, loose matches on Subject: below --
2015-05-12 20:33 Maxime Ripard
2015-05-12 20:33 ` Maxime Ripard
[not found] ` <1431462804-30467-1-git-send-email-maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
2015-05-13 11:26 ` Mark Brown
2015-05-13 11:26 ` Mark Brown
[not found] ` <20150513112604.GI3066-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2015-05-13 12:35 ` Michal Suchanek
2015-05-13 12:35 ` Michal Suchanek
2015-05-13 12:51 ` Maxime Ripard
2015-05-13 12:51 ` Maxime Ripard
2015-05-13 14:36 ` Mark Brown
2015-05-13 14:36 ` Mark Brown
[not found] ` <20150513143610.GT2761-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2015-05-13 15:31 ` Michal Suchanek
2015-05-13 15:31 ` Michal Suchanek
[not found] ` <CAOMqctTd7xG6mwX9AojTH4uaGDY06xOgDFUP437VDiE0rp0sXA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-05-13 17:43 ` Mark Brown
2015-05-13 17:43 ` Mark Brown
2015-05-13 19:09 ` Maxime Ripard
2015-05-13 19:10 ` Geert Uytterhoeven
2015-05-13 19:10 ` Geert Uytterhoeven
[not found] ` <CAMuHMdWJ730G_a6=vQgs4gV837am5KKd7zEhU2FaHw2cpv=aRA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-05-13 19:41 ` Maxime Ripard
2015-05-13 19:41 ` Maxime Ripard
2015-05-13 15:37 ` Greg Kroah-Hartman
2015-05-13 15:37 ` Greg Kroah-Hartman
[not found] ` <20150513153740.GC11677-U8xfFu+wG4EAvxtiuMwx3w@public.gmane.org>
2015-05-13 15:52 ` Michal Suchanek
2015-05-13 15:52 ` Michal Suchanek
2015-05-13 17:13 ` Mark Brown
2015-05-13 17:13 ` Mark Brown
[not found] ` <20150513171300.GD2761-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2015-05-13 17:20 ` Greg Kroah-Hartman
2015-05-13 17:20 ` Greg Kroah-Hartman
[not found] ` <20150513172028.GA18303-U8xfFu+wG4EAvxtiuMwx3w@public.gmane.org>
2015-05-13 17:39 ` Mark Brown
2015-05-13 17:39 ` Mark Brown
[not found] ` <20150513173922.GF2761-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2015-05-13 18:16 ` Greg Kroah-Hartman
2015-05-13 18:16 ` Greg Kroah-Hartman
2015-05-13 18:32 ` Mark Brown
[not found] ` <20150513183211.GK2761-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2015-05-13 18:36 ` Greg Kroah-Hartman
2015-05-13 18:36 ` Greg Kroah-Hartman
[not found] ` <20150513183653.GA879-U8xfFu+wG4EAvxtiuMwx3w@public.gmane.org>
2015-05-13 18:51 ` Mark Brown
2015-05-13 18:51 ` Mark Brown
[not found] ` <20150513185149.GL2761-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2015-05-13 19:17 ` Maxime Ripard
2015-05-13 19:17 ` Maxime Ripard
2015-05-13 17:50 ` Maxime Ripard
2015-05-13 17:50 ` Maxime Ripard
2015-05-13 18:12 ` Mark Brown
2015-05-13 18:17 ` Greg Kroah-Hartman
2015-05-13 18:17 ` Greg Kroah-Hartman
[not found] ` <20150513181736.GC16811-U8xfFu+wG4EAvxtiuMwx3w@public.gmane.org>
2015-05-13 19:23 ` Geert Uytterhoeven
2015-05-13 19:23 ` Geert Uytterhoeven
2015-05-13 19:26 ` Maxime Ripard
2015-05-13 19:26 ` Maxime Ripard
2015-05-13 22:33 ` Greg Kroah-Hartman
2015-05-13 22:33 ` Greg Kroah-Hartman
[not found] ` <20150513223331.GA26748-U8xfFu+wG4EAvxtiuMwx3w@public.gmane.org>
2015-05-14 14:34 ` Mark Brown
2015-05-14 14:34 ` Mark Brown
2015-07-15 6:27 ` Lucas De Marchi
2015-07-15 6:27 ` Lucas De Marchi
2015-05-15 8:09 ` Maxime Ripard
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20140430180609.GC3000@lukather \
--to=maxime.ripard-wi1+55scjutkeb57/3fjtnbpr1lh4cv8@public.gmane.org \
--cc=alexandre.belloni-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org \
--cc=broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org \
--cc=linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
--cc=linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.