ASoC: Provide per widget type callback when executing DAPM sequences

Many modern devices have features such as DC servos which take time to start.
Currently these are handled by per-widget events but this makes it difficult
to paralleise operations on multiple widgets, meaning delays can end up
being needlessly serialised. By providing a callback to drivers when all
widgets of a given type have been handled during a DAPM sequence the core
allows drivers to start operations separately and wait for them to complete
much more simply.

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

1 files changed, 3 insertions, 0 deletions

diff --git a/include/sound/soc-dapm.h b/include/sound/soc-dapm.h
index a3760c93a8a3..6c9ae237814b 100644
--- a/include/sound/soc-dapm.h
+++ b/include/sound/soc-dapm.h
@@ -500,6 +500,9 @@ struct snd_soc_dapm_context {
 
         struct snd_soc_dapm_update *update;
 
+        void (*seq_notifier)(struct snd_soc_dapm_context *,
+                             enum snd_soc_dapm_type);
+
         struct device *dev; /* from parent - for debug */
         struct snd_soc_codec *codec; /* parent codec */
         struct snd_soc_card *card; /* parent card */