u-boot/doc/device-tree-bindings/device.txt
Simon Glass fa04cef644 acpi: Add a binding for ACPI settings in the device tree
Devices need to report various identifiers in the ACPI tables. Rather than
hard-coding these in drivers it is typically better to put them in the
device tree.

Add a binding file to describe this.

Signed-off-by: Simon Glass <sjg@chromium.org>
2020-04-30 17:16:12 +08:00

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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,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;
};