1、由于我linux版本为4.14，所以想把高版本linux5.0 里的源码里 AK5558（==ADAU1977）的驱动（驱动时正常的）添加我目前用的linux源码里
2、我修改了sound/soc/codes/ 下 Kconfig 和 Makefile文件 ，改动如下：
kconfig 添加：
select SND_SOC_AK5558 if I2C
和
config SND_SOC_AK5558
tristate "AKM AK5558 CODEC"
depends on I2C
select REGMAP_I2C
Makefile 添加：
snd-soc-ak5558-objs := ak5558.o
和
obj-$(CONFIG_SND_SOC_AK5558) += snd-soc-ak5558.o
然后menuconfig 配置好 选中 AK5558驱动选项，编译内核时出现
make[3]: *** No rule to make target 'sound/soc/codecs/ak5558.o', needed by 'sound/soc/codecs/snd-soc-ak5558.o'. Stop.
scripts/Makefile.build:573: recipe for target 'sound/soc/codecs' failed
make[2]: *** [sound/soc/codecs] Error 2
make[2]: *** Waiting for unfinished jobs....
scripts/Makefile.build:573: recipe for target 'sound/soc' failed
make[1]: *** [sound/soc] Error 2
Makefile:1024: recipe for target 'sound' failed
make: *** [sound] Error 2
make: *** Waiting for unfinished jobs....
AR kernel/built-in.o
这种现象应该是少修改了哪个地方？ 是不是与 select REGMAP_I2C有关！谢谢了
