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ASoC: davinci-mcasp: Document GPIO support 

McASP pins can be used as GPIO, add optional section to enable GPIO support
for McASP.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
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Peter Ujfalusi 2019-01-03 16:05:51 +02:00 committed by Mark Brown
parent ae33ba2a8b
commit 4664b94c98
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Documentation/devicetree/bindings/sound/davinci-mcasp-audio.txt
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@ -45,6 +45,23 @@ Optional properties:
- fck_parent : Should contain a valid clock name which will be used as parent
for the McASP fck
Optional GPIO support:
If any McASP pin need to be used as GPIO then the McASP node must have:
...
gpio-controller
#gpio-cells = <2>;
...
When requesting a GPIO, the first parameter is the PIN index in McASP_P*
registers.
For example to request the AXR2 pin of mcasp8:
function-gpios = <&mcasp8 2 0>;
Or to request the ACLKR pin of mcasp8:
function-gpios = <&mcasp8 29 0>;
For generic gpio information, please refer to bindings/gpio/gpio.txt
Example:
mcasp0: mcasp0@1d00000 {