On Mon, 03 Jun 2024 12:25:55 +0200 Nuno Sá <noname.nuno@xxxxxxxxx> 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@xxxxxxxxxxxx> 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@xxxxxxxxxxxxxx/ > > > > 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@xxxxxxxxxx> > Done
