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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. "linux,wakeup" Documentation/devicetree/bindings/input/gpio-matrix-keypad.txt
+ Documentation/devicetree/bindings/mfd/tc3589x.txt
+ Documentation/devicetree/bindings/input/touchscreen/ads7846.txt
+5. "linux,keypad-wakeup" Documentation/devicetree/bindings/input/qcom,pm8xxx-keypad.txt
+6. "linux,input-wakeup" Documentation/devicetree/bindings/input/samsung-keypad.txt
+7. "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>;
+ };
+ [....]
+ };