From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Mark Brown <broonie@kernel.org>
Cc: Maxime Ripard <maxime.ripard@free-electrons.com>,
linux-kernel@vger.kernel.org, Hans de Goede <hdegoede@redhat.com>,
linux-spi@vger.kernel.org, Martin Sperl <kernel@martin.sperl.org>,
Michal Suchanek <hramrach@gmail.com>
Subject: Re: [PATCH] spi: Force the registration of the spidev devices
Date: Wed, 13 May 2015 08:37:40 -0700 [thread overview]
Message-ID: <20150513153740.GC11677@kroah.com> (raw)
In-Reply-To: <20150513112604.GI3066@sirena.org.uk>
On Wed, May 13, 2015 at 12:26:04PM +0100, Mark Brown wrote:
> On Tue, May 12, 2015 at 10:33:24PM +0200, Maxime Ripard wrote:
>
> > While this is nicer than the DT solution because of its accurate hardware
> > representation, it's still not perfect because you might not have access to the
> > DT, or you might be driving a completely generic device (such as a
> > microcontroller) that might be used for something else in a different
> > context/board.
>
> Greg, you're copied on this because this seems to be a generic problem
> that should perhaps be solved at a driver model level - having a way to
> bind userspace access to devices that we don't otherwise have a driver
> for. The subsystem could specify the UIO driver to use when no other
> driver is available.
That doesn't really work. I've been talking to the ACPI people about
this, and the problem is "don't otherwise have a driver for" is an
impossible thing to prove, as you never know when a driver is going to
be loaded from userspace.
You can easily bind drivers to devices today from userspace, why not
just use the built-in functionality you have today if you "know" that
there is no driver for this hardware.
thanks,
greg k-h
WARNING: multiple messages have this Message-ID (diff)
From: Greg Kroah-Hartman <gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org>
To: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: Maxime Ripard
<maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Martin Sperl <kernel-TqfNSX0MhmxHKSADF0wUEw@public.gmane.org>,
Michal Suchanek
<hramrach-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Subject: Re: [PATCH] spi: Force the registration of the spidev devices
Date: Wed, 13 May 2015 08:37:40 -0700 [thread overview]
Message-ID: <20150513153740.GC11677@kroah.com> (raw)
In-Reply-To: <20150513112604.GI3066-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
On Wed, May 13, 2015 at 12:26:04PM +0100, Mark Brown wrote:
> On Tue, May 12, 2015 at 10:33:24PM +0200, Maxime Ripard wrote:
>
> > While this is nicer than the DT solution because of its accurate hardware
> > representation, it's still not perfect because you might not have access to the
> > DT, or you might be driving a completely generic device (such as a
> > microcontroller) that might be used for something else in a different
> > context/board.
>
> Greg, you're copied on this because this seems to be a generic problem
> that should perhaps be solved at a driver model level - having a way to
> bind userspace access to devices that we don't otherwise have a driver
> for. The subsystem could specify the UIO driver to use when no other
> driver is available.
That doesn't really work. I've been talking to the ACPI people about
this, and the problem is "don't otherwise have a driver for" is an
impossible thing to prove, as you never know when a driver is going to
be loaded from userspace.
You can easily bind drivers to devices today from userspace, why not
just use the built-in functionality you have today if you "know" that
there is no driver for this hardware.
thanks,
greg k-h
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next prev parent reply other threads:[~2015-05-13 15:37 UTC|newest]
Thread overview: 94+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-12 20:33 [PATCH] spi: Force the registration of the spidev devices Maxime Ripard
2015-05-12 20:33 ` Maxime Ripard
2015-05-13 9:34 ` [PATCH] spi: Add option to bind spidev to all chipselects Michal Suchanek
2015-05-13 9:34 ` Michal Suchanek
2015-05-13 10:16 ` Maxime Ripard
2015-05-13 10:16 ` Maxime Ripard
2015-05-13 10:40 ` Michal Suchanek
2015-05-13 10:40 ` Michal Suchanek
2015-05-13 11:05 ` Mark Brown
2015-05-13 11:05 ` Mark Brown
2015-05-13 11:26 ` [PATCH] spi: Force the registration of the spidev devices Mark Brown
2015-05-13 11:26 ` Mark Brown
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
2015-05-13 15:31 ` Michal Suchanek
2015-05-13 15:31 ` Michal Suchanek
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
2015-05-13 19:41 ` Maxime Ripard
2015-05-13 19:41 ` Maxime Ripard
2015-05-13 15:37 ` Greg Kroah-Hartman [this message]
2015-05-13 15:37 ` Greg Kroah-Hartman
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
2015-05-13 17:20 ` Greg Kroah-Hartman
2015-05-13 17:20 ` Greg Kroah-Hartman
2015-05-13 17:39 ` Mark Brown
2015-05-13 17:39 ` Mark Brown
2015-05-13 18:16 ` Greg Kroah-Hartman
2015-05-13 18:16 ` Greg Kroah-Hartman
2015-05-13 18:32 ` Mark Brown
2015-05-13 18:36 ` Greg Kroah-Hartman
2015-05-13 18:36 ` Greg Kroah-Hartman
2015-05-13 18:51 ` Mark Brown
2015-05-13 18:51 ` Mark Brown
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
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
2015-05-14 14:34 ` Mark Brown
2015-05-14 14:34 ` Mark Brown
2015-05-15 8:09 ` Maxime Ripard
2015-07-15 6:27 ` Lucas De Marchi
2015-07-15 6:27 ` Lucas De Marchi
-- strict thread matches above, loose matches on Subject: below --
2014-04-28 17:22 Maxime Ripard
2014-04-28 17:22 ` Maxime Ripard
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
2014-04-30 18:06 ` Maxime Ripard
2014-05-01 1:18 ` Mark Brown
2014-05-01 1:18 ` Mark Brown
2014-05-01 22:36 ` Maxime Ripard
2014-05-01 22:36 ` Maxime Ripard
2014-05-01 23:28 ` Geert Uytterhoeven
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
2014-05-05 13:57 ` Alexandre Belloni
2014-05-05 13:57 ` Alexandre Belloni
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
2014-05-08 2:22 ` Maxime Ripard
2014-05-08 2:22 ` Maxime Ripard
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