path: root/dts/Bindings/gpio/gpio-restart.txt
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Diffstat (limited to 'dts/Bindings/gpio/gpio-restart.txt')
1 files changed, 0 insertions, 54 deletions
diff --git a/dts/Bindings/gpio/gpio-restart.txt b/dts/Bindings/gpio/gpio-restart.txt
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--- a/dts/Bindings/gpio/gpio-restart.txt
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-Drive a GPIO line that can be used to restart the system from a restart
-This binding supports level and edge triggered reset. At driver load
-time, the driver will request the given gpio line and install a restart
-handler. If the optional properties 'open-source' is not found, the GPIO line
-will be driven in the inactive state. Otherwise its not driven until
-the restart is initiated.
-When the system is restarted, the restart handler will be invoked in
-priority order. The gpio is configured as an output, and driven active,
-triggering a level triggered reset condition. This will also cause an
-inactive->active edge condition, triggering positive edge triggered
-reset. After a delay specified by active-delay, the GPIO is set to
-inactive, thus causing an active->inactive edge, triggering negative edge
-triggered reset. After a delay specified by inactive-delay, the GPIO
-is driven active again. After a delay specified by wait-delay, the
-restart handler completes allowing other restart handlers to be attempted.
-Required properties:
-- compatible : should be "gpio-restart".
-- gpios : The GPIO to set high/low, see "gpios property" in
- Documentation/devicetree/bindings/gpio/gpio.txt. If the pin should be
- low to reset the board set it to "Active Low", otherwise set
- gpio to "Active High".
-Optional properties:
-- open-source : Treat the GPIO as being open source and defer driving
- it to when the restart is initiated. If this optional property is not
- specified, the GPIO is initialized as an output in its inactive state.
-- priority : A priority ranging from 0 to 255 (default 128) according to
- the following guidelines:
- 0: Restart handler of last resort, with limited restart
- capabilities
- 128: Default restart handler; use if no other restart handler is
- expected to be available, and/or if restart functionality is
- sufficient to restart the entire system
- 255: Highest priority restart handler, will preempt all other
- restart handlers
-- active-delay: Delay (default 100) to wait after driving gpio active [ms]
-- inactive-delay: Delay (default 100) to wait after driving gpio inactive [ms]
-- wait-delay: Delay (default 3000) to wait after completing restart
- sequence [ms]
-gpio-restart {
- compatible = "gpio-restart";
- gpios = <&gpio 4 0>;
- priority = <128>;
- active-delay = <100>;
- inactive-delay = <100>;
- wait-delay = <3000>;