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Specifying wakeup capability for devices
============================================
Any device nodes
----------------
Nodes that describe devices which have wakeup capability may contain a
"wakeup-source" boolean property.
If the device is marked as a wakeup-source, interrupt wake capability depends
on the device specific "interrupt-names" property. If no interrupts are labeled
as wake capable, then it is up to the device to determine which interrupts can
wake the system.
However if a device has a dedicated interrupt as the wakeup source, then it
needs to specify/identify it using a device specific interrupt name. In such
cases only that interrupt can be used as a wakeup interrupt.
While various legacy interrupt names exist, new devices should use "wakeup" as
the canonical interrupt name.
List of legacy properties and respective binding document
---------------------------------------------------------
1. "gpio-key,wakeup" Documentation/devicetree/bindings/input/gpio-keys{,-polled}.txt
2. "has-tpo" Documentation/devicetree/bindings/rtc/rtc-opal.txt
3. "linux,wakeup" Documentation/devicetree/bindings/input/gpio-matrix-keypad.txt
Documentation/devicetree/bindings/mfd/tc3589x.txt
Documentation/devicetree/bindings/input/touchscreen/ads7846.txt
4. "linux,keypad-wakeup" Documentation/devicetree/bindings/input/qcom,pm8xxx-keypad.txt
5. "linux,input-wakeup" Documentation/devicetree/bindings/input/samsung-keypad.txt
6. "nvidia,wakeup-source" Documentation/devicetree/bindings/input/nvidia,tegra20-kbc.txt
Examples
--------
1. With "wakeup" interrupt name
device@10000 {
compatible = "vendor,device-id";
reg = <0x10000 0x1000>;
interrupts = <0 19 4>, <0 21 4>, <0 22 4>;
interrupt-names = "ack", "err", "wakeup";
wakeup-source;
};
2. Without "wakeup" interrupt name
embedded-controller {
compatible = "google,cros-ec-i2c";
reg = <0x1e>;
interrupts = <6 0>;
interrupt-parent = <&gpx1>;
pinctrl-names = "default";
pinctrl-0 = <&ec_irq>;
wakeup-source;
};
3. Without interrupts
gpio_keys {
compatible = "gpio-keys";
#address-cells = <1>;
#size-cells = <0>;
button@1 {
debounce-interval = <50>;
wakeup-source;
linux,code = <116>;
label = "POWER";
gpios = <&iofpga_gpio0 0 0x4>;
};
[....]
};
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