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- 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 {
- u-boot,dm-pre-reloc;
- reg = <0x02006810 0 0 0 0>;
- compatible = "intel,apl-p2sb";
- early-regs = <IOMAP_P2SB_BAR 0x100000>;
- pci,no-autoconfig;
- n {
- compatible = "intel,apl-pinctrl";
- u-boot,dm-pre-reloc;
- intel,p2sb-port-id = <PID_GPIO_N>;
- acpi,path = "\\_SB.GPO0";
- gpio_n: gpio-n {
- compatible = "intel,gpio";
- u-boot,dm-pre-reloc;
- gpio-controller;
- #gpio-cells = <2>;
- linux-name = "INT3452:00";
- };
- };
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