Hmm, I just enabled the 'Build all ASoC CODEC drivers' option (I don't
have the hardware) to build-test to see if I could get the same
warning as Christian and I didn't, but I did get this in the same
tree:
sound/soc/codecs/ak4641.c: In function ‘ak4641_probe’:
sound/soc/codecs/ak4641.c:524:6: error: ‘GPIOF_OUT_INIT_LOW’
undeclared (first use in this function)
sound/soc/codecs/ak4641.c:524:6: note: each undeclared identifier is
reported only once for each function it appears in
make[3]: *** [sound/soc/codecs/ak4641.o] Error 1
make[2]: *** [sound/soc/codecs] Error 2
make[1]: *** [sound/soc] Error 2
make: *** [sound] Error 2
make: *** Waiting for unfinished jobs....