| Devices | |
| ======= | |
| Device bindings are described by their own individual binding files. | |
| U-Boot provides for some optional properties which are documented here. See | |
| also hid-over-i2c.txt which describes HID devices. See also | |
| Documentation/firmware-guide/acpi/enumeration.rst in the Linux kernel for | |
| the acpi,compatible property. | |
| - acpi,has-power-resource : (boolean) true if this device has a power resource. | |
| This causes an ACPI PowerResource to be written containing the properties | |
| provided by this binding, to describe how to handle powering the device up | |
| and down using GPIOs | |
| - acpi,compatible : compatible string to report | |
| - acpi,ddn : Contains the string to use as the _DDN (DOS (Disk Operating | |
| System) Device Name) | |
| - acpi,hid : Contains the string to use as the HID (Hardware ID) | |
| identifier _HID | |
| - acpi,path : Specifies the full ACPI path for a device. This overrides the | |
| normal path built from the driver-model hierarchy | |
| - acpi,name : Provides the ACPI name for a device, which is a string consisting | |
| of four alphanumeric character (upper case) | |
| - acpi,uid : _UID value for device | |
| - acpi,wake : Provides the GPE used to detect a request from a device to wake | |
| from sleep | |
| - linux,probed : Tells U-Boot to add 'linux,probed' to the ACPI tables so that | |
| Linux will only load the driver if the device can be detected (e.g. on I2C | |
| bus). Note that this is an out-of-tree Linux feature. | |
| Example | |
| ------- | |
| elan_touchscreen: elan-touchscreen@10 { | |
| compatible = "i2c-chip"; | |
| reg = <0x10>; | |
| acpi,hid = "ELAN0001"; | |
| acpi,ddn = "ELAN Touchscreen"; | |
| interrupts-extended = <&acpi_gpe GPIO_21_IRQ IRQ_TYPE_EDGE_FALLING>; | |
| linux,probed; | |
| }; | |
| pcie-a0@14,0 { | |
| reg = <0x0000a000 0 0 0 0>; | |
| acpi,name = "RP01"; | |
| wifi: wifi { | |
| compatible = "intel,generic-wifi"; | |
| acpi,ddn = "Intel WiFi"; | |
| acpi,name = "WF00"; | |
| acpi,wake = <GPE0_DW3_00>; | |
| interrupts-extended = <&acpi_gpe 0x3c 0>; | |
| }; | |
| }; | |
| p2sb: p2sb@d,0 { | |
| bootph-all; | |
| reg = <0x02006810 0 0 0 0>; | |
| compatible = "intel,apl-p2sb"; | |
| early-regs = <IOMAP_P2SB_BAR 0x100000>; | |
| pci,no-autoconfig; | |
| n { | |
| compatible = "intel,apl-pinctrl"; | |
| bootph-all; | |
| intel,p2sb-port-id = <PID_GPIO_N>; | |
| acpi,path = "\\_SB.GPO0"; | |
| gpio_n: gpio-n { | |
| compatible = "intel,gpio"; | |
| bootph-all; | |
| gpio-controller; | |
| #gpio-cells = <2>; | |
| linux-name = "INT3452:00"; | |
| }; | |
| }; |