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author | Sascha Hauer <s.hauer@pengutronix.de> | 2016-06-13 07:31:46 +0200 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2016-06-13 12:43:53 +0200 |
commit | 86186c232241b607f84cc266a6cda49160f44948 (patch) | |
tree | 286a87dae7f2d8c3eda5b8551fc9b5f4db726c45 /dts/Bindings/power/reset/gpio-poweroff.txt | |
parent | 0cf29e11efa66ad4515c9391303406c725be2c7a (diff) | |
download | barebox-86186c232241b607f84cc266a6cda49160f44948.tar.gz barebox-86186c232241b607f84cc266a6cda49160f44948.tar.xz |
dts: update to v4.7-rc1
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'dts/Bindings/power/reset/gpio-poweroff.txt')
-rw-r--r-- | dts/Bindings/power/reset/gpio-poweroff.txt | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/dts/Bindings/power/reset/gpio-poweroff.txt b/dts/Bindings/power/reset/gpio-poweroff.txt new file mode 100644 index 0000000000..d4eab9227e --- /dev/null +++ b/dts/Bindings/power/reset/gpio-poweroff.txt @@ -0,0 +1,36 @@ +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>; +}; |