1Devices
2=======
3
4Device bindings are described by their own individual binding files.
5
6U-Boot provides for some optional properties which are documented here. See
7also hid-over-i2c.txt which describes HID devices. See also
8Documentation/firmware-guide/acpi/enumeration.rst in the Linux kernel for
9the acpi,compatible property.
10
11 - acpi,has-power-resource : (boolean) true if this device has a power resource.
12    This causes an ACPI PowerResource to be written containing the properties
13    provided by this binding, to describe how to handle powering the device up
14    and down using GPIOs
15 - acpi,compatible : compatible string to report
16 - acpi,ddn : Contains the string to use as the _DDN (DOS (Disk Operating
17    System) Device Name)
18 - acpi,hid : Contains the string to use as the HID (Hardware ID)
19    identifier _HID
20 - acpi,path : Specifies the full ACPI path for a device. This overrides the
21    normal path built from the driver-model hierarchy
22 - acpi,name : Provides the ACPI name for a device, which is a string consisting
23   of four alphanumeric character (upper case)
24 - acpi,uid : _UID value for device
25 - acpi,wake : Provides the GPE used to detect a request from a device to wake
26   from sleep
27 - linux,probed : Tells U-Boot to add 'linux,probed' to the ACPI tables so that
28    Linux will only load the driver if the device can be detected (e.g. on I2C
29    bus). Note that this is an out-of-tree Linux feature.
30
31
32Example
33-------
34
35elan_touchscreen: elan-touchscreen@10 {
36	compatible = "i2c-chip";
37	reg = <0x10>;
38	acpi,hid = "ELAN0001";
39	acpi,ddn = "ELAN Touchscreen";
40	interrupts-extended = <&acpi_gpe GPIO_21_IRQ IRQ_TYPE_EDGE_FALLING>;
41	linux,probed;
42};
43
44pcie-a0@14,0 {
45	reg = <0x0000a000 0 0 0 0>;
46	acpi,name = "RP01";
47	wifi: wifi {
48		compatible = "intel,generic-wifi";
49		acpi,ddn = "Intel WiFi";
50		acpi,name = "WF00";
51		acpi,wake = <GPE0_DW3_00>;
52		interrupts-extended = <&acpi_gpe 0x3c 0>;
53	};
54};
55
56p2sb: p2sb@d,0 {
57	u-boot,dm-pre-reloc;
58	reg = <0x02006810 0 0 0 0>;
59	compatible = "intel,apl-p2sb";
60	early-regs = <IOMAP_P2SB_BAR 0x100000>;
61	pci,no-autoconfig;
62
63	n {
64		compatible = "intel,apl-pinctrl";
65		u-boot,dm-pre-reloc;
66		intel,p2sb-port-id = <PID_GPIO_N>;
67		acpi,path = "\\_SB.GPO0";
68		gpio_n: gpio-n {
69			compatible = "intel,gpio";
70			u-boot,dm-pre-reloc;
71			gpio-controller;
72			#gpio-cells = <2>;
73			linux-name = "INT3452:00";
74		};
75	};
76