1Specifying wakeup capability for devices 2============================================ 3 4Any device nodes 5---------------- 6Nodes that describe devices which have wakeup capability may contain a 7"wakeup-source" boolean property. 8 9If the device is marked as a wakeup-source, interrupt wake capability depends 10on the device specific "interrupt-names" property. If no interrupts are labeled 11as wake capable, then it is up to the device to determine which interrupts can 12wake the system. 13 14However if a device has a dedicated interrupt as the wakeup source, then it 15needs to specify/identify it using a device specific interrupt name. In such 16cases only that interrupt can be used as a wakeup interrupt. 17 18While various legacy interrupt names exist, new devices should use "wakeup" as 19the canonical interrupt name. 20 21List of legacy properties and respective binding document 22--------------------------------------------------------- 23 241. "gpio-key,wakeup" Documentation/devicetree/bindings/input/gpio-keys{,-polled}.txt 252. "has-tpo" Documentation/devicetree/bindings/rtc/rtc-opal.txt 263. "linux,wakeup" Documentation/devicetree/bindings/input/gpio-matrix-keypad.txt 27 Documentation/devicetree/bindings/mfd/tc3589x.txt 28 Documentation/devicetree/bindings/input/touchscreen/ads7846.txt 294. "linux,keypad-wakeup" Documentation/devicetree/bindings/input/qcom,pm8xxx-keypad.txt 305. "linux,input-wakeup" Documentation/devicetree/bindings/input/samsung-keypad.txt 316. "nvidia,wakeup-source" Documentation/devicetree/bindings/input/nvidia,tegra20-kbc.txt 32 33Examples 34-------- 35 361. With "wakeup" interrupt name 37 38 device@10000 { 39 compatible = "vendor,device-id"; 40 reg = <0x10000 0x1000>; 41 interrupts = <0 19 4>, <0 21 4>, <0 22 4>; 42 interrupt-names = "ack", "err", "wakeup"; 43 wakeup-source; 44 }; 45 462. Without "wakeup" interrupt name 47 48 embedded-controller { 49 compatible = "google,cros-ec-i2c"; 50 reg = <0x1e>; 51 interrupts = <6 0>; 52 interrupt-parent = <&gpx1>; 53 pinctrl-names = "default"; 54 pinctrl-0 = <&ec_irq>; 55 wakeup-source; 56 }; 57 583. Without interrupts 59 60 gpio_keys { 61 compatible = "gpio-keys"; 62 #address-cells = <1>; 63 #size-cells = <0>; 64 65 button@1 { 66 debounce-interval = <50>; 67 wakeup-source; 68 linux,code = <116>; 69 label = "POWER"; 70 gpios = <&iofpga_gpio0 0 0x4>; 71 }; 72 [....] 73 }; 74