ASoC: Allow CODECs to ask soc-cache to suppress physical writes

Currently the soc-cache code will always write to the device, meaning
that we need the device to be powered and active at pretty much all
times the system is active.  Allowing cache only writes lays some
groundwork for future enhancements to allow devices to be put into a
full off state when the audio subsystem is idle.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/sound/soc.h b/include/sound/soc.h
index 4bbeb9f..4e8f14b 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -423,6 +423,7 @@ struct snd_soc_codec {
 	short reg_cache_step;
 
 	unsigned int idle_bias_off:1; /* Use BIAS_OFF instead of STANDBY */
+	unsigned int cache_only:1;  /* Suppress writes to hardware */
 
 	/* dapm */
 	u32 pop_time;