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Add ability to export the pin used by the gpio-poweroff driver #2552

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merged 3 commits into from
May 13, 2018
Merged

Add ability to export the pin used by the gpio-poweroff driver #2552

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3ade441
Add ability to export gpio used by gpio-poweroff
nick-bulleid May 10, 2018
35931d8
Added export feature to gpio-poweroff documentation
nick-bulleid May 12, 2018
ee1cf38
Updated the gpio-poweroff overlay and README entry
nick-bulleid May 12, 2018
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1 change: 1 addition & 0 deletions Documentation/devicetree/bindings/power/reset/gpio-poweroff.txt
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Expand Up @@ -27,6 +27,7 @@ Optional properties:
it to an output when the power-off handler is called. If this optional
property is not specified, the GPIO is initialized as an output in its
inactive state.
- export : Export the GPIO line to the sysfs system

Examples:

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3 changes: 3 additions & 0 deletions arch/arm/boot/dts/overlays/README
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Expand Up @@ -588,6 +588,9 @@ Params: gpiopin GPIO for signalling (default 26)
custom dt-blob.bin to prevent a power-down
during the boot process, and that a reboot
will also cause the pin to go low.
input Set if the gpio pin should be configured as
an input.
export Set to export the configured pin to sysfs


Name: gpio-shutdown
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2 changes: 2 additions & 0 deletions arch/arm/boot/dts/overlays/gpio-poweroff-overlay.dts
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Expand Up @@ -30,5 +30,7 @@
gpiopin = <&power_ctrl>,"gpios:4",
<&power_ctrl_pins>,"brcm,pins:0";
active_low = <&power_ctrl>,"gpios:8";
input = <&power_ctrl>,"input?";
export = <&power_ctrl>,"export?";
};
};
9 changes: 9 additions & 0 deletions drivers/power/reset/gpio-poweroff.c
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Expand Up @@ -50,6 +50,7 @@ static int gpio_poweroff_probe(struct platform_device *pdev)
bool input = false;
enum gpiod_flags flags;
bool force = false;
bool export = false;

/* If a pm_power_off function has already been added, leave it alone */
force = of_property_read_bool(pdev->dev.of_node, "force");
Expand All @@ -70,6 +71,12 @@ static int gpio_poweroff_probe(struct platform_device *pdev)
if (IS_ERR(reset_gpio))
return PTR_ERR(reset_gpio);

export = of_property_read_bool(pdev->dev.of_node, "export");
if (export) {
gpiod_export(reset_gpio, false);
gpiod_export_link(&pdev->dev, "poweroff-gpio", reset_gpio);
}

pm_power_off = &gpio_poweroff_do_poweroff;
return 0;
}
Expand All @@ -79,6 +86,8 @@ static int gpio_poweroff_remove(struct platform_device *pdev)
if (pm_power_off == &gpio_poweroff_do_poweroff)
pm_power_off = NULL;

gpiod_unexport(reset_gpio);

return 0;
}

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