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fefac0b064
For many device types it is possible to figure out the name just by looking at its uclass or parent. Add a function to handle this, since it allows us to cover the vast majority of cases automatically. However it is sometimes impossible to figure out an ACPI name for a device just by looking at its uclass. For example a touch device may have a vendor-specific name. Add a new "acpi,name" property to allow a custom name to be created. With this new feature we can drop the get_name() methods in the sandbox I2C and SPI drivers. They were only added for testing purposes. Update the tests to use the new values. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
50 lines
1.6 KiB
Plaintext
50 lines
1.6 KiB
Plaintext
Devices
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=======
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Device bindings are described by their own individual binding files.
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U-Boot provides for some optional properties which are documented here. See
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also hid-over-i2c.txt which describes HID devices. See also
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Documentation/firmware-guide/acpi/enumeration.rst in the Linux kernel for
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the acpi,compatible property.
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- acpi,has-power-resource : (boolean) true if this device has a power resource.
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This causes an ACPI PowerResource to be written containing the properties
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provided by this binding, to describe how to handle powering the device up
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and down using GPIOs
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- acpi,compatible : compatible string to report
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- acpi,ddn : Contains the string to use as the _DDN (DOS (Disk Operating
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System) Device Name)
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- acpi,hid : Contains the string to use as the HID (Hardware ID)
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identifier _HID
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- acpi,name : Provides the ACPI name for a device, which is a string consisting
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of four alphanumeric character (upper case)
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- acpi,uid : _UID value for device
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- linux,probed : Tells U-Boot to add 'linux,probed' to the ACPI tables so that
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Linux will only load the driver if the device can be detected (e.g. on I2C
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bus). Note that this is an out-of-tree Linux feature.
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Example
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-------
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elan_touchscreen: elan-touchscreen@10 {
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compatible = "i2c-chip";
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reg = <0x10>;
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acpi,hid = "ELAN0001";
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acpi,ddn = "ELAN Touchscreen";
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interrupts-extended = <&acpi_gpe GPIO_21_IRQ IRQ_TYPE_EDGE_FALLING>;
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linux,probed;
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};
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pcie-a0@14,0 {
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reg = <0x0000a000 0 0 0 0>;
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acpi,name = "RP01";
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wifi: wifi {
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compatible = "intel,generic-wifi";
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acpi,ddn = "Intel WiFi";
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acpi,name = "WF00";
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interrupts-extended = <&acpi_gpe 0x3c 0>;
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};
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};
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