On Mon, Mar 20, 2017 at 10:13:52AM +0100, Linus Walleij wrote: > The WM8903 has four different voltage inputs: AVDD, CPVDD, DBVDD > and DCVDD. On the Qualcomm APQ8060 Dragonboard these are all > supplied from proper regulators and thus need activating and > binding. > > This is a quick-and-dirty solution just grabbing and enabling the > regulator supplies on probe() and disabling them on remove() and > the errorpath. More elaborate power management is likely possible. > > I assume the nVidia designs using this codec have some hard-wired > always-on power and will be happy with using the dummy regulators > for this. But someone from the nVidia camp should probably check > whether they can bind these to proper regulators instead. > > We also amend the DT binding document. A small change like this > does not warrant a separate patch for augmenting these. > > Cc: devicetree@xxxxxxxxxxxxxxx > Cc: Mark Brown <broonie@xxxxxxxxxx> > Cc: Liam Girdwood <lgirdwood@xxxxxxxxx> > Cc: Stephen Warren <swarren@xxxxxxxxxx> > Cc: Charles Keepax <ckeepax@xxxxxxxxxxxxxxxxxxxxxxxxxxx> > Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx> > --- > Mark: I was thinking about adding runtime PM for disabling > these regulators when unused, but I'm uncertain about the > interaction with DAPM in that regard. This atleast gives us > control over the supplies. > --- > Documentation/devicetree/bindings/sound/wm8903.txt | 13 +++++++++ Acked-by: Rob Herring <robh@xxxxxxxxxx> > sound/soc/codecs/wm8903.c | 31 ++++++++++++++++++++++ > 2 files changed, 44 insertions(+) _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
