dt-bindings: sound: omap-mcpdm: Update documentation for pdmclk

McPDM module receives it's functional clock from external source. This
clock is the pdmclk provided by the twl6040 audio IC. If the clock is not
available all register accesses to McPDM fails and the module is not
operational.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/Documentation/devicetree/bindings/sound/omap-mcpdm.txt b/Documentation/devicetree/bindings/sound/omap-mcpdm.txt
index 5f4e68ca228cb7aec18555533e59a51eecd62ec7..ff98a0cb5b3f242d512fdcb1f80893e29cedbf91 100644 (file)
--- a/Documentation/devicetree/bindings/sound/omap-mcpdm.txt
+++ b/Documentation/devicetree/bindings/sound/omap-mcpdm.txt
@@ -7,6 +7,8 @@ Required properties:
        <L3 interconnect address, size>;
 - interrupts: Interrupt number for McPDM
 - ti,hwmods: Name of the hwmod associated to the McPDM
+- clocks:  phandle for the pdmclk provider, likely <&twl6040>
+- clock-names: Must be "pdmclk"
 
 Example:
 
@@ -18,3 +20,11 @@ mcpdm: mcpdm@40132000 {
        interrupt-parent = <&gic>;
        ti,hwmods = "mcpdm";
 };
+
+In board DTS file the pdmclk needs to be added:
+
+&mcpdm {
+       clocks = <&twl6040>;
+       clock-names = "pdmclk";
+       status = "okay";
+};