ASoC: da7219: Add common clock usage for providing DAI clks

There is a need to use DA7219 as DAI clock master for other codecs
within a system, which means that the DAI clocks are required to
remain, regardless of whether the codec is actually running
playback/capture. To be able to expose control of the DAI clocking
the common clock framework has been employed.

The current implementation adds a simple clock gate for enabling
and disabling the DAI clocks, with no rate control supported
(this is still handled through standard hw_params() functions as
before). If DT is enabled then the clock is added to the OF
providers list, otherwise a clkdev lookup is used.

Signed-off-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/sound/da7219.txt b/Documentation/devicetree/bindings/sound/da7219.txt
index 5b54d2d045c3..c3df92d31c4b 100644
--- a/Documentation/devicetree/bindings/sound/da7219.txt
+++ b/Documentation/devicetree/bindings/sound/da7219.txt
@@ -25,6 +25,9 @@ Optional properties:
   interrupt is to be used to wake system, otherwise "irq" should be used.
 - wakeup-source: Flag to indicate this device can wake system (suspend/resume).
 
+- #clock-cells :  Should be set to '<0>', only one clock source provided;
+- clock-output-names : Name given for DAI clocks output;
+
 - clocks : phandle and clock specifier for codec MCLK.
 - clock-names : Clock name string for 'clocks' attribute, should be "mclk".
 
@@ -83,6 +86,9 @@ Example:
 		VDDMIC-supply = <&reg_audio>;
 		VDDIO-supply = <&reg_audio>;
 
+		#clock-cells = <0>;
+		clock-output-names = "dai-clks";
+
 		clocks = <&clks 201>;
 		clock-names = "mclk";