linux-kernel - Re: [PATCH] staging:iio:proof of concept in kernel interface.

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Date:	Fri, 14 Oct 2011 16:59:28 +0100
From:	Jonathan Cameron <jic23@....ac.uk>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
CC:	linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
	zdevai@...il.com, linus.walleij@...aro.org
Subject: Re: [PATCH] staging:iio:proof of concept in kernel interface.

On 10/13/11 21:44, Mark Brown wrote:
> On Thu, Oct 13, 2011 at 03:46:04PM +0100, Jonathan Cameron wrote:
> 
>>> I guess an actual implementation would have wrappers for doing the
>>> indirections rather than having users peer into the ops table directly?
> 
>> Yup, for some reason the cover letter seems to have detached from this.
>> It suggested exactly that.  There may be weird cases where peering this
>> deep into the ops makes sense, but not for something like this one.
> 
> Oh, right.  As a general rule I don't read cover letters for single
> patches until after I've read the patch, generally they're either
> completely content free (if only by virtue of repeating the changelog)
> or there's a problem with the changelog in the actual patch not
> explaining what's going on.
Fair enough.

I'm trying to work out what our equivalent of the clk finding api is.

The best match pair to match on I can come up with is:

part name: iio_dev.name

dev_name of underlying hardware if specified.
dev_name(iio_dev->dev.parent)
This matching source can be overridden by an optional callback if we
unique matching is achievable in some other way for the device.

Typical pairs:

max1363, 0-0035
max1238, 0-0034
lis3l02dq spi1.0
adis16400 spi2.1

On soc ADCs can use any combination of the two that makes local
sense.

Does this look sufficient for description / identification?

Precedence order of both, then column 2 (lets call that id) and finally column 1
(part name).

The concept of connections doesn't make sense quite like it does for clks as
we are getting a reference to the whole device, then picking which bits we want
afterwards.

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