linux-kernel - Re: [linux-sunxi] [PATCH 2/3] spidev: Add DT binding example.

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Message-ID: <CAOMqctSMeWvG6YsCFn5=wxS2nCBbMiiCKUNJh8oFsH1VZY4H-w@mail.gmail.com>
Date:	Wed, 29 Apr 2015 20:37:24 +0200
From:	Michal Suchanek <hramrach@...il.com>
To:	Mark Brown <broonie@...nel.org>
Cc:	"Eric D." <eric.dillmann@...il.com>,
	linux-sunxi <linux-sunxi@...glegroups.com>,
	Jonathan Corbet <corbet@....net>,
	Hans de Goede <hdegoede@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	linux-spi <linux-spi@...r.kernel.org>,
	Martin Sperl <kernel@...tin.sperl.org>
Subject: Re: [linux-sunxi] [PATCH 2/3] spidev: Add DT binding example.

On 29 April 2015 at 20:06, Mark Brown <broonie@...nel.org> wrote:
> On Wed, Apr 29, 2015 at 07:44:59PM +0200, Michal Suchanek wrote:
>> On 29 April 2015 at 19:40, Mark Brown <broonie@...nel.org> wrote:
>
>> > Please stop this, it is not helpful.
>
>> Then please make one of the useful ways of instantiating spidev nodes
>> approved or suggest another that when implemented can be mainlined.
>
> I think the rest of the thread had that covered - there's both adding
> the device IDs and Maxime's patch.

And adding device IDs is unacceptable for users of devboards while
Maxime's patch is not accepted into the kernel.

I am using a version of Maxime's patch myself right now. It does not
seem it's going to be include in the kernel any time soon, however.

FWIW I added the ability to open any CS, even those claimed by kernel
drivers. This addresses any potential race of spidev binding before
the actual driver but has the potential to introduce some subtle bugs
when you open and reconfigure a CS used by a kernel driver or send
some commands that upset the device.

Thanks

Michal
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