linux-kernel - Re: [PATCH] spi: Force the registration of the spidev devices

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Message-ID: <20150513181216.GH2761@sirena.org.uk>
Date:	Wed, 13 May 2015 19:12:16 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, Hans de Goede <hdegoede@...hat.com>,
	linux-spi@...r.kernel.org, Martin Sperl <kernel@...tin.sperl.org>,
	Michal Suchanek <hramrach@...il.com>
Subject: Re: [PATCH] spi: Force the registration of the spidev devices

On Wed, May 13, 2015 at 07:50:34PM +0200, Maxime Ripard wrote:
> On Wed, May 13, 2015 at 08:37:40AM -0700, Greg Kroah-Hartman wrote:

> > 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.

> What we're really after here is that we want to have an spidev
> instance when we don't even have a device.

We do?

> And since SPI isn't really doing any kind of hotplug, the only
> situation that might be problematic is if we have the DT overlays
> registering new devices.

Well, we still have the driver loaded from userspace in the future
situation as well - the hardware might be static but the software isn't.

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