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Unverified Commit 4664b94c authored by Peter Ujfalusi's avatar Peter Ujfalusi Committed by Mark Brown
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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: default avatarPeter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent ae33ba2a

Documentation/devicetree/bindings/sound/davinci-mcasp-audio.txt

+17 −0
Original line number Diff line number Diff line
@@ -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 {