linux-kernel - Re: [PATCH v3 1/8] iio:core: add a callback to allow drivers to provide

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Date:   Mon, 7 Nov 2016 17:46:41 +0100
From:   Slawomir Stepien <sst@...zta.fm>
To:     Peter Rosin <peda@...ntia.se>
Cc:     Daniel Baluta <daniel.baluta@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        Devicetree List <devicetree@...r.kernel.org>
Subject: Re: [PATCH v3 1/8] iio:core: add a callback to allow drivers to
 provide _available attributes

On Nov 07, 2016 12:57, Peter Rosin wrote:
> On 2016-11-07 12:37, Daniel Baluta wrote:
> > On Mon, Oct 24, 2016 at 1:39 AM, Peter Rosin <peda@...ntia.se> wrote:
> >> From: Jonathan Cameron <jic23@...nel.org>
> >>
> >> A large number of attributes can only take a limited range of values.
> >> Currently in IIO this is handled by directly registering additional
> >> *_available attributes thus providing this information to userspace.
> >>
> >> It is desirable to provide this information via the core for much the same
> >> reason this was done for the actual channel information attributes in the
> >> first place.  If it isn't there, then it can only really be accessed from
> >> userspace.  Other in kernel IIO consumers have no access to what valid
> >> parameters are.
> >>
> >> Two forms are currently supported:
> >> * list of values in one particular IIO_VAL_* format.
> >>         e.g. 1.300000 1.500000 1.730000
> >> * range specification with a step size:
> >>         e.g. [1.000000 0.500000 2.500000]
> >>         equivalent to 1.000000 1.5000000 2.000000 2.500000
> > 
> > Is there any driver using this format? :)
> 
> Yes, soon. Hopefully. See patch 3/8
> iio: mcp4531: provide range of available raw values
> https://patchwork.kernel.org/patch/9391283/

I would also like to add this to mcp4131.c and ds1803.c.

-- 
Slawomir Stepien