Specifying wakeup capability for devices
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============================================
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Any device nodes
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----------------
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Nodes that describe devices which has wakeup capability must contain an
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"wakeup-source" boolean property.
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Also, if device is marked as a wakeup source, then all the primary
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interrupt(s) can be used as wakeup interrupt(s).
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However if the devices have dedicated interrupt as the wakeup source
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then they need to specify/identify the same using device specific
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interrupt name. In such cases only that interrupt can be used as wakeup
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interrupt.
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List of legacy properties and respective binding document
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---------------------------------------------------------
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1. "enable-sdio-wakeup" Documentation/devicetree/bindings/mmc/mmc.txt
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2. "gpio-key,wakeup" Documentation/devicetree/bindings/input/gpio-keys{,-polled}.txt
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3. "has-tpo" Documentation/devicetree/bindings/rtc/rtc-opal.txt
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4. "linux,wakeup" Documentation/devicetree/bindings/input/gpio-matrix-keypad.txt
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Documentation/devicetree/bindings/mfd/tc3589x.txt
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Documentation/devicetree/bindings/input/touchscreen/ads7846.txt
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5. "linux,keypad-wakeup" Documentation/devicetree/bindings/input/qcom,pm8xxx-keypad.txt
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6. "linux,input-wakeup" Documentation/devicetree/bindings/input/samsung-keypad.txt
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7. "nvidia,wakeup-source" Documentation/devicetree/bindings/input/nvidia,tegra20-kbc.txt
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Examples
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--------
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1. With "wakeup" interrupt name
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device@10000 {
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compatible = "vendor,device-id";
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reg = <0x10000 0x1000>;
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interrupts = <0 19 4>, <0 21 4>, <0 22 4>;
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interrupt-names = "ack", "err", "wakeup";
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wakeup-source;
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};
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2. Without "wakeup" interrupt name
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embedded-controller {
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compatible = "google,cros-ec-i2c";
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reg = <0x1e>;
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interrupts = <6 0>;
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interrupt-parent = <&gpx1>;
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pinctrl-names = "default";
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pinctrl-0 = <&ec_irq>;
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wakeup-source;
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};
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3. Without interrupts
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gpio_keys {
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compatible = "gpio-keys";
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#address-cells = <1>;
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#size-cells = <0>;
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button@1 {
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debounce-interval = <50>;
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wakeup-source;
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linux,code = <116>;
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label = "POWER";
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gpios = <&iofpga_gpio0 0 0x4>;
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};
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[....]
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};
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