At the moment, the edt-ft5x06 driver can control a single regulator
("vcc"). However, some FocalTech touch controllers have an additional
IOVCC pin that should be supplied with the digital I/O voltage.
The I/O voltage might be provided by another regulator that should also
be kept on. Otherwise, the touchscreen can randomly stop functioning if
the regulator is turned off because no other components still require it.
Document (optional) support for controlling the regulator for IOVCC
using "iovcc-supply".
Cc: Ondrej Jirman <megous@xxxxxxxxxx>
Cc: Marco Felsch <m.felsch@xxxxxxxxxxxxxx>
Acked-by: Rob Herring <robh@xxxxxxxxxx>
Signed-off-by: Stephan Gerhold <stephan@xxxxxxxxxxx>
---
Changes in v2: None, added Rob's Acked-by
v1: https://lore.kernel.org/linux-input/20210108192337.563679-1-stephan@xxxxxxxxxxx/
---
.../devicetree/bindings/input/touchscreen/edt-ft5x06.yaml | 1 +
1 file changed, 1 insertion(+)
diff --git a/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.yaml b/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.yaml
index bfc3a8b5e118..2e8da7470513 100644
--- a/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.yaml
+++ b/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.yaml
@@ -56,6 +56,7 @@ properties:
wakeup-source: true
vcc-supply: true
+ iovcc-supply: true
gain:
description: Allows setting the sensitivity in the range from 0 to 31.
--
2.31.1
