mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-09-12 15:53:21 +09:00
37 lines
1.3 KiB
Plaintext
37 lines
1.3 KiB
Plaintext
![]() |
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,uid : _UID value for device
|
||
|
- 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;
|
||
|
};
|