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Diffstat (limited to 'roms/u-boot/doc/device-tree-bindings/device.txt')
| -rw-r--r-- | roms/u-boot/doc/device-tree-bindings/device.txt | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/roms/u-boot/doc/device-tree-bindings/device.txt b/roms/u-boot/doc/device-tree-bindings/device.txt new file mode 100644 index 000000000..73ce2a3b5 --- /dev/null +++ b/roms/u-boot/doc/device-tree-bindings/device.txt @@ -0,0 +1,75 @@ +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"; + }; + }; |