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

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Date:	Wed, 30 Apr 2014 11:06:09 -0700
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Mark Brown <broonie@...nel.org>
Cc:	linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Subject: Re: [PATCH] spi: Force the registration of the spidev devices

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

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