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-rw-r--r--Documentation/devicetree/bindings/sound/simple-card.txt3
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/sound/simple-card.txt b/Documentation/devicetree/bindings/sound/simple-card.txt
index c7a93931fad2..166f2290233b 100644
--- a/Documentation/devicetree/bindings/sound/simple-card.txt
+++ b/Documentation/devicetree/bindings/sound/simple-card.txt
@@ -86,6 +86,9 @@ Optional CPU/CODEC subnodes properties:
in dai startup() and disabled with
clk_disable_unprepare() in dai
shutdown().
+- system-clock-direction-out : specifies clock direction as 'out' on
+ initialization. It is useful for some aCPUs with
+ fixed clocks.
Example 1 - single DAI link: