Lines Matching +full:reset +full:- +full:gpio

1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/power/reset/gpio-restart.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: GPIO controlled reset
10   - Sebastian Reichel <sre@kernel.org>
13   Drive a GPIO line that can be used to restart the system from a restart handler.
15   This binding supports level and edge triggered reset.  At driver load time, the driver will
16   request the given gpio line and install a restart handler. If the optional properties
17   'open-source' is not found, the GPIO line will be driven in the inactive state.  Otherwise its
20   When the system is restarted, the restart handler will be invoked in priority order.  The GPIO
21   is configured as an output, and driven active, triggering a level triggered reset condition.
22   This will also cause an inactive->active edge condition, triggering positive edge triggered
23   reset. After a delay specified by active-delay, the GPIO is set to inactive, thus causing an
24   active->inactive edge, triggering negative edge triggered reset. After a delay specified by
25   inactive-delay, the GPIO is driven active again.  After a delay specified by wait-delay, the
29   - $ref: restart-handler.yaml#
33     const: gpio-restart
36     description: The GPIO to set high/low, see "gpios property" in
37       Documentation/devicetree/bindings/gpio/gpio.txt. If the pin should be low to reset the board
38       set it to "Active Low", otherwise set GPIO to "Active High".
40   open-source:
42     description: Treat the GPIO as being open source and defer driving it to when the restart is
43       initiated.  If this optional property is not specified, the GPIO is initialized as an output
49   active-delay:
51     description: Delay (default 100) to wait after driving gpio active [ms]
54   inactive-delay:
56     description: Delay (default 100) to wait after driving gpio inactive [ms]
59   wait-delay:
67   - compatible
68   - gpios
71   - |
72     gpio-restart {
73       compatible = "gpio-restart";
74       gpios = <&gpio 4 0>;
76       active-delay = <100>;
77       inactive-delay = <100>;
78       wait-delay = <3000>;