ASoC: wm8903: add regulator handling

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@vger.kernel.org
Cc: Mark Brown <broonie@kernel.org>
Cc: Liam Girdwood <lgirdwood@gmail.com>
Cc: Stephen Warren <swarren@nvidia.com>
Cc: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 13 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/sound/wm8903.txt b/Documentation/devicetree/bindings/sound/wm8903.txt
index 94ec32c194bb..afc51caf1137 100644
--- a/Documentation/devicetree/bindings/sound/wm8903.txt
+++ b/Documentation/devicetree/bindings/sound/wm8903.txt
@@ -28,6 +28,14 @@ Optional properties:
     performed. If any entry has the value 0xffffffff, that GPIO's
     configuration will not be modified.
 
+  - AVDD-supply : Analog power supply regulator on the AVDD pin.
+
+  - CPVDD-supply : Charge pump supply regulator on the CPVDD pin.
+
+  - DBVDD-supply : Digital buffer supply regulator for the DBVDD pin.
+
+  - DCVDD-supply : Digital core supply regulator for the DCVDD pin.
+
 Pins on the device (for linking into audio routes):
 
   * IN1L
@@ -54,6 +62,11 @@ codec: wm8903@1a {
 	reg = <0x1a>;
 	interrupts = < 347 >;
 
+	AVDD-supply = <&fooreg_a>;
+	CPVDD-supply = <&fooreg_b>;
+	DBVDD-supply = <&fooreg_c>;
+	DCVDC-supply = <&fooreg_d>;
+
 	gpio-controller;
 	#gpio-cells = <2>;