On Tue, Sep 15, 2015 at 08:18:32AM +0200, Pavel Machek wrote:
Hi!
I've got an embedded system with two arizona / wm5102 codecs.
Unfortunately, kernel does not seem to be ready for that configuration.
In particular, drivers/regulator/arizona-ldo1.c and drivers/regulator/arizona-micsupp.c register system-wide "MICVDD" and "LDO1" regulators, but with two codecs in the system, we really have wm5102-codec.1.MICVDD, wm5102-codec.2.MICVDD, wm5102-codec.1.LDO1 and wm5102-codec.2.LDO1.
That got me second codec working in two-codec configuration, but first one still stops working as soon as two codecs are enabled.
If you have idea what else needs fixing, let me know.
Best regards, Pavel
I must confess I haven't ever tested a system with two Arizona CODECs connected. Yes it seems you would get clashes on the regulator names, I guess that would need to be fixed up. If you were doing so wm831x-ldo.c would probably make a reasonable example.
I guess you would need to be careful with the machine driver as well, you will need to use a snd_soc_codec_conf structure for at least one (although I would do both) of the CODECs to give a prefix for all the widget/control names, otherwise those will clash and everything will probably behave very strangely. See sound/soc/samsung/bells.c for an example doing this for wm9081.
Those are the only two things that spring to mind at the moment but keep me informed on how you are getting on and I will let you know if I can come up with any other traps.
It seems that davinci-evm takes data from device tree, but then uses statically-allocated evm_soc_card, which would lead to problems in dual-codec config....?
That somewhat depends on how you plan on doing things. I had assumed you would be having a single machine driver with both CODECs connected to it, in which case the statically allocated snd_soc_card wouldn't be a problem. However, if you wanted to have two seperate machine drivers with a single CODEC connected to each then you would have an issue.
I guess either approach is reasonable and probably just depends on what your end goal is.
Thanks, Charles