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dt-bindings: input: tm2-touchkey: document vddio-supply 

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.

Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20201203131242.44397-2-stephan@gerhold.net
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Stephan Gerhold 2020-12-09 19:37:46 -08:00 committed by Dmitry Torokhov
parent 31a10f5b4b
commit 3e730ec11d
1 changed files with 5 additions and 0 deletions
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5
Documentation/devicetree/bindings/input/cypress,tm2-touchkey.yaml
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@ -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