ASoC: tas5086: add support for pwm start mode config

The TAS5086 has two alternative modes to start its PWM channels, Mid-Z
and Low-Z. Which one to use depends on how the PWM power stages are
connected to the TAS5086.

This patch adds 6 optional boolean properties to the DT bindings of the
driver which allow the user to configure each individual channel to the
Mid-Z scheme, and leaves all the others to the default (Low-Z).

Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

1 files changed, 11 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/sound/ti,tas5086.txt b/Documentation/devicetree/bindings/sound/ti,tas5086.txt
index 8ea4f5b4818d..d2866a0d6a26 100644
--- a/Documentation/devicetree/bindings/sound/ti,tas5086.txt
+++ b/Documentation/devicetree/bindings/sound/ti,tas5086.txt
@@ -20,6 +20,17 @@ Optional properties:
                         When not specified, the hardware default of 1300ms
                         is retained.
 
+ - ti,mid-z-channel-X:  Boolean properties, X being a number from 1 to 6.
+                        If given, channel X will start with the Mid-Z start
+                        sequence, otherwise the default Low-Z scheme is used.
+
+                        The correct configuration depends on how the power
+                        stages connected to the PWM output pins work. Not all
+                        power stages are compatible to Mid-Z - please refer
+                        to the datasheets for more details.
+
+                        Most systems should not set any of these properties.
+
 Examples:
 
         i2c_bus {