ASoC: simple-card: Enable and disable DAI clocks as needed

Call clk_prepare_enable() and clk_disable_unprepare() for cpu dai
clock and codec dai clock in dai statup and shutdown callbacks. This
to make sure the related clock are enabled when the audio device is
used.

Signed-off-by: Jyri Sarha <jsarha@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/sound/simple-card.txt b/Documentation/devicetree/bindings/sound/simple-card.txt
index c3cba600bf11..73bf314f7240 100644
--- a/Documentation/devicetree/bindings/sound/simple-card.txt
+++ b/Documentation/devicetree/bindings/sound/simple-card.txt
@@ -75,6 +75,11 @@ Optional CPU/CODEC subnodes properties:
                                           it can be specified via "clocks" if system has
                                           clock node (= common clock), or "system-clock-frequency"
                                           (if system doens't support common clock)
+                                          If a clock is specified, it is
+                                          enabled with clk_prepare_enable()
+                                          in dai startup() and disabled with
+                                          clk_disable_unprepare() in dai
+                                          shutdown().
 
 Example 1 - single DAI link: