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

From: Mark Brown
Date: Thu Apr 30 2015 - 15:58:52 EST

On Wed, Apr 29, 2015 at 08:37:24PM +0200, Michal Suchanek wrote:
> On 29 April 2015 at 20:06, Mark Brown <broonie@xxxxxxxxxx> wrote:

> > 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.

A big reason for that is that it's not in my inbox for me to review,
these messages I flagged as unhelpful aren't going to help with that if
only because I don't want to create the impression that such behaviour
achieves results.

> 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.

This doesn't seem like an obviously good idea - having userspace be able
to interact with a device without a running kernel driver knowing about
it doesn't seem like something that will end well.

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