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ACPI: docs: enumeration: Update UART serial bus resource documentation 

In some cases UART serial bus resource may be represented by struct
serdev_device.

Fixes: 53c7626356 ("serdev: Add ACPI support")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Andy Shevchenko 2022-03-01 00:39:31 +02:00 committed by Rafael J. Wysocki
parent b625fe6946
commit d72f06cee0
1 changed files with 6 additions and 5 deletions
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11
Documentation/firmware-guide/acpi/enumeration.rst
View File

@ -19,16 +19,17 @@ possible we decided to do following:
platform devices.
- Devices behind real busses where there is a connector resource
are represented as struct spi_device or struct i2c_device
(standard UARTs are not busses so there is no struct uart_device).
are represented as struct spi_device or struct i2c_device. Note
that standard UARTs are not busses so there is no struct uart_device,
although some of them may be represented by sturct serdev_device.
As both ACPI and Device Tree represent a tree of devices (and their
resources) this implementation follows the Device Tree way as much as
possible.
The ACPI implementation enumerates devices behind busses (platform, SPI and
I2C), creates the physical devices and binds them to their ACPI handle in
the ACPI namespace.
The ACPI implementation enumerates devices behind busses (platform, SPI,
I2C, and in some cases UART), creates the physical devices and binds them
to their ACPI handle in the ACPI namespace.
This means that when ACPI_HANDLE(dev) returns non-NULL the device was
enumerated from ACPI namespace. This handle can be used to extract other