tree 3c10da44183691038959ba0b53d5598ac1aaabc4
parent 1b4246a1fc487370665bf6c55aac8eae379642c0
author Mark Brown <broonie@opensource.wolfsonmicro.com> 1240421095 +0100
committer Mark Brown <broonie@opensource.wolfsonmicro.com> 1240423813 +0100

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>