summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorJohan Hovold <johan+linaro@kernel.org>2024-05-07 16:48:17 +0200
committerBenjamin Tissoires <bentiss@kernel.org>2024-06-07 11:16:55 +0200
commite538d4b85b8f1e3534dfbb42c2273f18bbb59d6e (patch)
tree01d9dddb797270f22976b4447967061b1888843f
parent07fc16fa55522520f5e4b2e35c72650f11079c35 (diff)
dt-bindings: HID: i2c-hid: elan: add 'no-reset-on-power-off' property
When the power supply is shared with other peripherals the reset line can be wired in such a way that it can remain deasserted regardless of whether the supply is on or not. This is important as it can be used to avoid holding the controller in reset for extended periods of time when it remains powered, something which can lead to increased power consumption. Leaving reset deasserted also avoids leaking current through the reset circuitry pull-up resistors. Add a new 'no-reset-on-power-off' devicetree property which can be used by the OS to determine when reset needs to be asserted on power down. Note that this property can also be used when the supply cannot be turned off by the OS at all. Signed-off-by: Johan Hovold <johan+linaro@kernel.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Link: https://lore.kernel.org/r/20240507144821.12275-4-johan+linaro@kernel.org Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
-rw-r--r--Documentation/devicetree/bindings/input/elan,ekth6915.yaml6
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/input/elan,ekth6915.yaml b/Documentation/devicetree/bindings/input/elan,ekth6915.yaml
index be84f7ed0abc..a62916d07a08 100644
--- a/Documentation/devicetree/bindings/input/elan,ekth6915.yaml
+++ b/Documentation/devicetree/bindings/input/elan,ekth6915.yaml
@@ -36,6 +36,12 @@ properties:
reset-gpios:
description: Reset GPIO; not all touchscreens using eKTH6915 hook this up.
+ no-reset-on-power-off:
+ type: boolean
+ description:
+ Reset line is wired so that it can (and should) be left deasserted when
+ the power supply is off.
+
vcc33-supply:
description: The 3.3V supply to the touchscreen.