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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>
This commit is contained in:
Peter Ujfalusi 2018-11-14 14:46:30 +02:00 committed by Mark Brown
parent 80e733fda4
commit 22cc062c4d
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Documentation/devicetree/bindings/sound/omap-mcpdm.txt
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@ -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";
};