diff mbox series

[2/3] bindings: sound: davinci-mcasp: Document GPIO support

Message ID 20190103140552.29809-3-peter.ujfalusi@ti.com (mailing list archive)
State Accepted
Commit 4664b94c98b4f9fdd3845da41d5c65288e59c66c
Headers show
Series ASoC: ti: davinci-mcasp: GPIO mode support for pins | expand

Commit Message

Peter Ujfalusi Jan. 3, 2019, 2:05 p.m. UTC 
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>
---
 .../bindings/sound/davinci-mcasp-audio.txt      | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/sound/davinci-mcasp-audio.txt b/Documentation/devicetree/bindings/sound/davinci-mcasp-audio.txt
index b279b6072bd5..a58f79f5345c 100644
--- a/Documentation/devicetree/bindings/sound/davinci-mcasp-audio.txt
+++ b/Documentation/devicetree/bindings/sound/davinci-mcasp-audio.txt
@@ -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 {