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>
