Re: [PATCH] spi: Force the registration of the spidev devices
From: Greg Kroah-Hartman
Date: Wed May 13 2015 - 11:37:46 EST
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.
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