From: Michal Suchanek <msuchanek@xxxxxxx> commit 52eb063d153ac310058fbaa91577a72c0e7a7169 upstream. The device cannot be probed on !ACPI and gives this warning: drivers/soundwire/slave.c:16:12: warning: ‘sdw_slave_add’ defined but not used [-Wunused-function] static int sdw_slave_add(struct sdw_bus *bus, ^~~~~~~~~~~~~ Cc: stable@xxxxxxxxxxxxxxx Fixes: 7c3cd189b86d ("soundwire: Add Master registration") Signed-off-by: Michal Suchanek <msuchanek@xxxxxxx> Link: https://lore.kernel.org/r/bd685232ea511251eeb9554172f1524eabf9a46e.1570097621.git.msuchanek@xxxxxxx Signed-off-by: Vinod Koul <vkoul@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/soundwire/Kconfig | 1 + 1 file changed, 1 insertion(+) --- a/drivers/soundwire/Kconfig +++ b/drivers/soundwire/Kconfig @@ -5,6 +5,7 @@ menuconfig SOUNDWIRE tristate "SoundWire support" + depends on ACPI help SoundWire is a 2-Pin interface with data and clock line ratified by the MIPI Alliance. SoundWire is used for transporting data