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- Specifying wakeup capability for devices
- ============================================
- Any device nodes
- ----------------
- Nodes that describe devices which has wakeup capability must contain an
- "wakeup-source" boolean property.
- Also, if device is marked as a wakeup source, then all the primary
- interrupt(s) can be used as wakeup interrupt(s).
- However if the devices have dedicated interrupt as the wakeup source
- then they need to specify/identify the same using device specific
- interrupt name. In such cases only that interrupt can be used as wakeup
- interrupt.
- List of legacy properties and respective binding document
- ---------------------------------------------------------
- 1. "enable-sdio-wakeup" Documentation/devicetree/bindings/mmc/mmc.txt
- 2. "gpio-key,wakeup" Documentation/devicetree/bindings/input/gpio-keys{,-polled}.txt
- 3. "has-tpo" Documentation/devicetree/bindings/rtc/rtc-opal.txt
- 4. "isil,irq2-can-wakeup-machine" Documentation/devicetree/bindings/rtc/isil,isl12057.txt
- 5. "linux,wakeup" Documentation/devicetree/bindings/input/gpio-matrix-keypad.txt
- Documentation/devicetree/bindings/mfd/tc3589x.txt
- Documentation/devicetree/bindings/input/ads7846.txt
- 6. "linux,keypad-wakeup" Documentation/devicetree/bindings/input/qcom,pm8xxx-keypad.txt
- 7. "linux,input-wakeup" Documentation/devicetree/bindings/input/samsung-keypad.txt
- 8. "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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