1Specifying wakeup capability for devices 2============================================ 3 4Any device nodes 5---------------- 6Nodes that describe devices which has wakeup capability must contain an 7"wakeup-source" boolean property. 8 9Also, if device is marked as a wakeup source, then all the primary 10interrupt(s) can be used as wakeup interrupt(s). 11 12However if the devices have dedicated interrupt as the wakeup source 13then they need to specify/identify the same using device specific 14interrupt name. In such cases only that interrupt can be used as wakeup 15interrupt. 16 17List of legacy properties and respective binding document 18--------------------------------------------------------- 19 201. "gpio-key,wakeup" Documentation/devicetree/bindings/input/gpio-keys{,-polled}.txt 212. "has-tpo" Documentation/devicetree/bindings/rtc/rtc-opal.txt 223. "linux,wakeup" Documentation/devicetree/bindings/input/gpio-matrix-keypad.txt 23 Documentation/devicetree/bindings/mfd/tc3589x.txt 24 Documentation/devicetree/bindings/input/touchscreen/ads7846.txt 254. "linux,keypad-wakeup" Documentation/devicetree/bindings/input/qcom,pm8xxx-keypad.txt 265. "linux,input-wakeup" Documentation/devicetree/bindings/input/samsung-keypad.txt 276. "nvidia,wakeup-source" Documentation/devicetree/bindings/input/nvidia,tegra20-kbc.txt 28 29Examples 30-------- 31 321. With "wakeup" interrupt name 33 34 device@10000 { 35 compatible = "vendor,device-id"; 36 reg = <0x10000 0x1000>; 37 interrupts = <0 19 4>, <0 21 4>, <0 22 4>; 38 interrupt-names = "ack", "err", "wakeup"; 39 wakeup-source; 40 }; 41 422. Without "wakeup" interrupt name 43 44 embedded-controller { 45 compatible = "google,cros-ec-i2c"; 46 reg = <0x1e>; 47 interrupts = <6 0>; 48 interrupt-parent = <&gpx1>; 49 pinctrl-names = "default"; 50 pinctrl-0 = <&ec_irq>; 51 wakeup-source; 52 }; 53 543. Without interrupts 55 56 gpio_keys { 57 compatible = "gpio-keys"; 58 #address-cells = <1>; 59 #size-cells = <0>; 60 61 button@1 { 62 debounce-interval = <50>; 63 wakeup-source; 64 linux,code = <116>; 65 label = "POWER"; 66 gpios = <&iofpga_gpio0 0 0x4>; 67 }; 68 [....] 69 }; 70