linux-kernel - Re: [PATCH v3 0/5] iio: add support for multiple scan types

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Message-ID: <20240602102726.35120347@jic23-huawei>
Date: Sun, 2 Jun 2024 10:27:26 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: David Lechner <dlechner@...libre.com>
Cc: Michael Hennerich <Michael.Hennerich@...log.com>, Nuno Sá
 <nuno.sa@...log.com>, Julien Stephan <jstephan@...libre.com>, Esteban Blanc
 <eblanc@...libre.com>, linux-iio@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 0/5] iio: add support for multiple scan types

On Sun, 2 Jun 2024 10:25:17 +0100
Jonathan Cameron <jic23@...nel.org> wrote:

> On Thu, 30 May 2024 10:14:07 -0500
> David Lechner <dlechner@...libre.com> wrote:
> 
> > Up to now, the IIO subsystem has only supported a single scan type per
> > channel. This scan type determines the binary format of the data in the
> > buffer when doing buffered reads.
> > 
> > For simple devices, there is only one scan type and all is well. But
> > for more complex devices, there may be multiple scan types. For example,
> > ADCs with a resolution boost feature that adds more bits to the raw
> > sample data. Traditionally, for slow devices, we've just always used the
> > highest resolution mode, but for high performance ADCs, this may not be
> > always practical. Manipulating data after every read can hurt performance
> > and in the case of hardware buffers, it may not be possible to change the
> > format of the data in the buffer at all. There are also ADCs where
> > enabling the higher resolution can only be done if oversampling is also
> > enabled which may not be desireable.
> > 
> > To allow for more flexibility, we would like to add support for multiple
> > scan types per channel.
> > 
> > To avoid having to touch every driver, we implemented this in a way that
> > preserves the existing scan_type field. See the "iio: add support for
> > multiple scan types per channel" the details. The first couple of patches
> > are just preparation for this.
> > 
> > [1]: https://lore.kernel.org/linux-iio/CAMknhBHOXaff__QyU-wFSNNENvs23vDX5n_ddH-Dw3s6-sQ9sg@mail.gmail.com/  
> 
> Nice series. Applied to the togreg branch of iio.git and pushed out as
> testing for 0-day to poke at it.
> 
> Obviously this v3 hasn't been on list that long, but there is still time
> as I doubt I'll push out a non rebasing tree for a week or so.
> This week is looking too busy!

oops. Goes to show I'm not keeping track of things very well today.
I haven't applied the driver this updates yet.

I'll look at that now and hopefully I can pick them both up.

Jonathan

> 
> Thanks,
> 
> Jonathan
> 
> 
>