tjh.dev
Linux kernel mirror (for testing)
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kernel
os
linux
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. "enable-sdio-wakeup" Documentation/devicetree/bindings/mmc/mmc.txt
212. "gpio-key,wakeup" Documentation/devicetree/bindings/input/gpio-keys{,-polled}.txt
223. "has-tpo" Documentation/devicetree/bindings/rtc/rtc-opal.txt
234. "linux,wakeup" Documentation/devicetree/bindings/input/gpio-matrix-keypad.txt
24 Documentation/devicetree/bindings/mfd/tc3589x.txt
25 Documentation/devicetree/bindings/input/ads7846.txt
265. "linux,keypad-wakeup" Documentation/devicetree/bindings/input/qcom,pm8xxx-keypad.txt
276. "linux,input-wakeup" Documentation/devicetree/bindings/input/samsung-keypad.txt
287. "nvidia,wakeup-source" Documentation/devicetree/bindings/input/nvidia,tegra20-kbc.txt
29
30Examples
31--------
32
331. With "wakeup" interrupt name
34
35 device@10000 {
36 compatible = "vendor,device-id";
37 reg = <0x10000 0x1000>;
38 interrupts = <0 19 4>, <0 21 4>, <0 22 4>;
39 interrupt-names = "ack", "err", "wakeup";
40 wakeup-source;
41 };
42
432. Without "wakeup" interrupt name
44
45 embedded-controller {
46 compatible = "google,cros-ec-i2c";
47 reg = <0x1e>;
48 interrupts = <6 0>;
49 interrupt-parent = <&gpx1>;
50 pinctrl-names = "default";
51 pinctrl-0 = <&ec_irq>;
52 wakeup-source;
53 };
54
553. Without interrupts
56
57 gpio_keys {
58 compatible = "gpio-keys";
59 #address-cells = <1>;
60 #size-cells = <0>;
61
62 button@1 {
63 debounce-interval = <50>;
64 wakeup-source;
65 linux,code = <116>;
66 label = "POWER";
67 gpios = <&iofpga_gpio0 0 0x4>;
68 };
69 [....]
70 };