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"; }; };