Commit 96ff0f5c authored by Jamie Lentin's avatar Jamie Lentin Committed by Jason Cooper
Browse files

power: Add simple poweroff-gpio driver 



Given appropriate devicetree bindings, this driver registers a
pm_power_off function to set a GPIO line high/low to power down
your board.

Signed-off-by: default avatarJamie Lentin <jm@lentin.co.uk>
Signed-off-by: default avatarAndrew Lunn <andrew@lunn.ch>
Tested-by: default avatarSimon Baatz <gmbnomis@gmail.com>
Signed-off-by: default avatarJason Cooper <jason@lakedaemon.net>
parent f4a00139

Documentation/devicetree/bindings/gpio/gpio-poweroff.txt

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GPIO line that should be set high/low to power off a device



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>; /* GPIO 4 Active Low */

};

drivers/power/Kconfig

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@@ -335,6 +335,9 @@ config AB8500_BATTERY_THERM_ON_BATCTRL 
	help

	  Say Y to enable battery temperature measurements using

	  thermistor connected on BATCTRL ADC.



source "drivers/power/reset/Kconfig"



endif # POWER_SUPPLY



source "drivers/power/avs/Kconfig"

drivers/power/Makefile

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@@ -49,3 +49,4 @@ obj-$(CONFIG_CHARGER_MAX8997) += max8997_charger.o 
obj-$(CONFIG_CHARGER_MAX8998)	+= max8998_charger.o

obj-$(CONFIG_POWER_AVS)		+= avs/

obj-$(CONFIG_CHARGER_SMB347)	+= smb347-charger.o

obj-$(CONFIG_POWER_RESET)	+= reset/

drivers/power/reset/Kconfig

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menuconfig POWER_RESET

	bool "Board level reset or power off"

	help

	  Provides a number of drivers which either reset a complete board

	  or shut it down, by manipulating the main power supply on the board.



	  Say Y here to enable board reset and power off



config POWER_RESET_GPIO

	bool "GPIO power-off driver"

	depends on OF_GPIO && POWER_RESET

	help

	  This driver supports turning off your board via a GPIO line.

	  If your board needs a GPIO high/low to power down, say Y and

	  create a binding in your devicetree.

drivers/power/reset/Makefile

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obj-$(CONFIG_POWER_RESET_GPIO) += gpio-poweroff.o