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

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Message-ID: <20150514143439.GP2761@sirena.org.uk>
Date:	Thu, 14 May 2015 15:34:39 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	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 03:33:31PM -0700, Greg Kroah-Hartman wrote:
> On Wed, May 13, 2015 at 09:26:40PM +0200, Maxime Ripard wrote:

> > Our use case is this one: we want to export spidev files so that "dev
> > boards" with a header that allows to plug virtually anything on it
> > (Raspberry Pi, Cubieboards, Xplained, and all the likes) without
> > having to change the kernel and / or device tree.

> You want to do that on a bus that is not self-describing or dynamic?
> I too want a pony.  Please go kick the hardware engineer who designed
> such a mess, we solved this problem 20+ years ago with "real" busses.

The hardware engineers for some of these things did build enumeration in
but none of them with any sort of community have been able to make it
stick - the community just ends up ignoring the ID allocation.

> > This patch is actually doing this: creating a new device for all the
> > chipselects that are not in use that will be bound to the spidev
> > driver.

> I have yet to see a patch...

That was the first message in the thread.

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