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authorWolfram Sang <wsa+renesas@sang-engineering.com>2016-04-12 18:00:53 +0200
committerLinus Walleij <linus.walleij@linaro.org>2016-04-15 16:04:32 +0200
commitc686090f14e0673f9b1a3aec316098742f8e003c (patch)
tree76406006013a8b30a82df22bd8632f12347b7ac5 /Documentation/devicetree/bindings/gpio/gpio-poweroff.txt
parent35b3fc8876ef927885f68e481efc049285d07e53 (diff)
downloadop-kernel-dev-c686090f14e0673f9b1a3aec316098742f8e003c.zip
op-kernel-dev-c686090f14e0673f9b1a3aec316098742f8e003c.tar.gz
gpio/reset: move gpio-{poweroff|restart} DT doc to proper place
I did only find them after a fuzzy search, so let them be where one would expect them. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Acked-By: Sebastian Reichel <sre@kernel.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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-Driver a GPIO line that can be used to turn the power off.
-
-The driver supports both level triggered and edge triggered power off.
-At driver load time, the driver will request the given gpio line and
-install a pm_power_off handler. If the optional properties 'input' is
-not found, the GPIO line will be driven in the inactive
-state. Otherwise its configured as an input.
-
-When the pm_power_off is called, the gpio is configured as an output,
-and drive active, so triggering a level triggered power off
-condition. This will also cause an inactive->active edge condition, so
-triggering positive edge triggered power off. After a delay of 100ms,
-the GPIO is set to inactive, thus causing an active->inactive edge,
-triggering negative edge triggered power off. After another 100ms
-delay the GPIO is driver active again. If the power is still on and
-the CPU still running after a 3000ms delay, a WARN_ON(1) is emitted.
-
-Required properties:
-- compatible : should be "gpio-poweroff".
-- gpios : The GPIO to set high/low, see "gpios property" in
- Documentation/devicetree/bindings/gpio/gpio.txt. If the pin should be
- low to power down the board set it to "Active Low", otherwise set
- gpio to "Active High".
-
-Optional properties:
-- input : Initially configure the GPIO line as an input. Only reconfigure
- it to an output when the pm_power_off function is called. If this optional
- property is not specified, the GPIO is initialized as an output in its
- inactive state.
-
-Examples:
-
-gpio-poweroff {
- compatible = "gpio-poweroff";
- gpios = <&gpio 4 0>;
-};
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