Re: [PATCH RFC 6/8] iio: frequency: ad9910: add RAM mode support

[Nuno Sá]

On Tue, 2026-03-03 at 15:32 +0000, Rodrigo Alencar wrote:
> On 26/03/01 01:31PM, Jonathan Cameron wrote:
> > On Fri, 20 Feb 2026 16:46:10 +0000
> > Rodrigo Alencar via B4 Relay <devnull+rodrigo.alencar.analog.com@xxxxxxxxxx> wrote:
> > 
> > > From: Rodrigo Alencar <rodrigo.alencar@xxxxxxxxxx>
> > > 
> > > Add RAM channel with support for profile-based control. This includes:
> > > - RAM data loading via binary sysfs attribute (ram_data);
> > 
> > I'm not sure that's a long term viable path.  We either need
> > to figure out how to do it as firmware file load, or via an output buffer.
> 
> Could you develop on this? it is not viable because iio would drop that
> support? using sysfs_create_bin_file() directly would be better?
> 
> > Firmware load would probably be too static and I'm not sure quite
> > how we map these to IIO output buffers.
> 
> will investigate this buffer route. At this point, we can have multiple
> buffers, right? I have the DMA engine buffer working with the parallel port.
> 
> ... 

In theory yes but we do have some issues with the implementation. I have some
fixes but for code that, unfortunately, cannot land upstream anytime soon and with
no users, these fixes can be an hard sell. So if we go the multi buffer support it
could be a great opportunity for these.

That said, the fixes are only meaningful if we do need to restrict channels to a specific
buffer. Not sure if that will be the case here.

- Nuno Sá