ASoC: Add power supply widget to DAPM

Many modern CODECs have shared resources on chip which must be enabled
for portions of the chip to work but which can be disabled at other times
in order to achieve power savings. Examples of such resources include
power supplies and some internal clocks.

Since these widgets are dependencies for the audio path but do not carry
audio signals they require slightly different handling to most widgets -
they do not contribute to the audio path and so should not be counted as
either inputs or outputs during path walks.

Cases where one supply provides a supply for another will require
additional work. There is also room for more optimisation of the graph
walking to avoid repeated checks for the same thing.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/include/sound/soc-dapm.h b/include/sound/soc-dapm.h
index 839a97b63269..533f9f256496 100644
--- a/include/sound/soc-dapm.h
+++ b/include/sound/soc-dapm.h
@@ -154,12 +154,16 @@
         .shift = wshift, .invert = winvert, \
         .event = wevent, .event_flags = wflags}
 
-/* generic register modifier widget */
+/* generic widgets */
 #define SND_SOC_DAPM_REG(wid, wname, wreg, wshift, wmask, won_val, woff_val) \
 {       .id = wid, .name = wname, .kcontrols = NULL, .num_kcontrols = 0, \
         .reg = -((wreg) + 1), .shift = wshift, .mask = wmask, \
         .on_val = won_val, .off_val = woff_val, .event = dapm_reg_event, \
         .event_flags = SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD}
+#define SND_SOC_DAPM_SUPPLY(wname, wreg, wshift, winvert, wevent, wflags) \
+{       .id = snd_soc_dapm_supply, .name = wname, .reg = wreg,  \
+        .shift = wshift, .invert = winvert, .event = wevent, \
+        .event_flags = wflags}
 
 /* dapm kcontrol types */
 #define SOC_DAPM_SINGLE(xname, reg, shift, max, invert) \
@@ -308,6 +312,7 @@ enum snd_soc_dapm_type {
         snd_soc_dapm_vmid,                      /* codec bias/vmid - to minimise pops */
         snd_soc_dapm_pre,                       /* machine specific pre widget - exec first */
         snd_soc_dapm_post,                      /* machine specific post widget - exec last */
+        snd_soc_dapm_supply,            /* power/clock supply */
 };
 
 /*