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

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Message-ID: <20240603205502.5e6155f4@jic23-huawei>
Date: Mon, 3 Jun 2024 20:55:02 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Nuno Sá <noname.nuno@...il.com>
Cc: David Lechner <dlechner@...libre.com>, 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 Mon, 03 Jun 2024 12:25:55 +0200
Nuno Sá <noname.nuno@...il.com> wrote:

> On Sun, 2024-06-02 at 10:25 +0100, Jonathan Cameron 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!  
> 
> If there's still time, feel free to add my tag:
> 
> Reviewed-by: Nuno Sa <nuno.sa@...log.com>
> 
Done