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Date: Sun, 2 Jun 2024 10:37:27 +0100
From: Jonathan Cameron <jic23@kernel.org>
To: David Lechner <dlechner@baylibre.com>
Cc: Michael Hennerich <Michael.Hennerich@analog.com>, Nuno =?UTF-8?B?U8Oh?=
 <nuno.sa@analog.com>, Julien Stephan <jstephan@baylibre.com>, Esteban Blanc
 <eblanc@baylibre.com>, linux-iio@vger.kernel.org,
 linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 0/5] iio: add support for multiple scan types
Message-ID: <20240602103727.007e34d6@jic23-huawei>
In-Reply-To: <20240602102726.35120347@jic23-huawei>
References: <20240530-iio-add-support-for-multiple-scan-types-v3-0-cbc4acea2cfa@baylibre.com>
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	<20240602102726.35120347@jic23-huawei>
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On Sun, 2 Jun 2024 10:27:26 +0100
Jonathan Cameron <jic23@kernel.org> wrote:

> On Sun, 2 Jun 2024 10:25:17 +0100
> Jonathan Cameron <jic23@kernel.org> wrote:
> 
> > On Thu, 30 May 2024 10:14:07 -0500
> > David Lechner <dlechner@baylibre.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.
> 
That was fine, so both now applied.
> Jonathan
> 
> > 
> > Thanks,
> > 
> > Jonathan
> > 
> > 
> >   
> 
>