SND_SOC_LITTLEMILL selects SND_SOC_WM8994, but SND_SOC_WM8994 needs MFD_WM8994. Thus we need to select MFD_WM8994 to fix below build error:

LD .tmp_vmlinux1 sound/built-in.o: In function `wm8994_write': sound/soc/codecs/wm8994.c:201: undefined reference to `wm8994_reg_write' sound/built-in.o: In function `wm8994_read': sound/soc/codecs/wm8994.c:222: undefined reference to `wm8994_reg_read' sound/built-in.o: In function `wm8994_resume': sound/soc/codecs/wm8994.c:2847: undefined reference to `wm8994_reg_read' sound/built-in.o: In function `wm8994_codec_probe': sound/soc/codecs/wm8994.c:3501: undefined reference to `wm8994_reg_read' sound/soc/codecs/wm8994.c:3660: undefined reference to `wm8994_reg_read' sound/soc/codecs/wm8994.c:3672: undefined reference to `wm8994_reg_read' sound/built-in.o: In function `wm8958_dsp2_fw': sound/soc/codecs/wm8958-dsp2.c:154: undefined reference to `wm8994_bulk_write' make: *** [.tmp_vmlinux1] Error 1

Signed-off-by: Axel Lin axel.lin@gmail.com --- sound/soc/samsung/Kconfig | 1 + 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/sound/soc/samsung/Kconfig b/sound/soc/samsung/Kconfig index 09d636c..f3417f2 100644 --- a/sound/soc/samsung/Kconfig +++ b/sound/soc/samsung/Kconfig @@ -210,4 +210,5 @@ config SND_SOC_LITTLEMILL tristate "Audio support for Wolfson Littlemill" depends on SND_SOC_SAMSUNG && MACH_WLF_CRAGG_6410 select SND_SAMSUNG_I2S + select MFD_WM8994 select SND_SOC_WM8994