The Samsung touchkey controllers are often used with external pull-up
for the interrupt line and the I2C lines, so we might need to enable
a regulator to bring the lines into usable state. Otherwise, this might
cause spurious interrupts and reading from I2C will fail.
Document support for a "vddio-supply" that is enabled by the tm2-touchkey
driver so that the regulator gets enabled when needed.
Cc: Linus Walleij <linus.walleij@xxxxxxxxxx>
Signed-off-by: Stephan Gerhold <stephan@xxxxxxxxxxx>
---
.../devicetree/bindings/input/cypress,tm2-touchkey.yaml | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/Documentation/devicetree/bindings/input/cypress,tm2-touchkey.yaml b/Documentation/devicetree/bindings/input/cypress,tm2-touchkey.yaml
index 90d4def83182..52dca8b64081 100644
--- a/Documentation/devicetree/bindings/input/cypress,tm2-touchkey.yaml
+++ b/Documentation/devicetree/bindings/input/cypress,tm2-touchkey.yaml
@@ -37,6 +37,11 @@ properties:
vcc-supply:
description: Optional regulator for MCU, 1.8V-3.3V (depending on MCU).
+ vddio-supply:
+ description: |
+ Optional regulator that provides digital I/O voltage,
+ e.g. for pulling up the interrupt line or the I2C pins.
+
linux,keycodes:
minItems: 1
maxItems: 4
--
2.29.2
