I have an architectural question regarding some work I’m doing. We have a product that hooks the Raspberry Pi to various amateur radio rigs via a sound card interface. The input characteristics of those radios vary widely in the amount of signal they need to drive the proper RF output and such. One of the setting s I’ve implemented to try to help our customers control this is changing the Common Mode voltage on the tlv320. There are a couple of options, but the gist is that one will allow higher output levels without clipping. We need to keep the flexibility of having the lower setting because there are some radios that require as little drive as possible.

My question is really surrounding where the appropriate setting for this would be. I could put it in the device tree, but that requires adding entries, pushing this past the DT folks and it becomes something that a user has to reboot to change settings on. I think it probably more appropriately goes as a mixer control so that it can be changed on the fly without reboot and is a dynamic parameter.

I just want to make sure there’s no strong preference here on the “right way” it should be done or if I’m missing a way to set this that’s a “none of the above.”

Thanks!

-- Annaliese McDermond nh6z@nh6z.net