* Mark Brown broonie@kernel.org [200218 17:43]:
On Tue, Feb 18, 2020 at 06:06:28PM +0100, Sebastian Reichel wrote:
simple-graph-card is the current machine driver. We might have to introduce a Droid 4 specific driver instead. I used simple(-graph)-card instead of introducing a new driver, since the setup was simple enough without modem and bluetooth. The simple card was perfect to test the CPCAP codec driver. The TDM things might be complex enough to create a new machine driver (as I mentioned in the original patchset adding CPCAP codec support).
I tend to agree here, phones are generally one of the most complicated classes of system for clocking and interconnects and the CODECs they use often the most complex too so they're really stretching the generic cards. It'd be nice to be able to handle things with generic cards but it's likely you'll run into issues that it'd be unreasonable to force you to address for system enablement. OTOH if you manage to get one of the generic cards working well that'd be excellent!
Well to me it seems that we just already have all the data needed with the graph binding and snd-soc-audio-graph-card + codec2codec support.
I don't think we have cases where the cpcap codec is not the master, so as long as the cpcap codec knows what's going on then there may not be a need for machine driver.
I guess the the bluetooth to modem path is the one to check to see what provides the clocks..
Regards,
Tony