@@ -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
In some cases UART serial bus resource may be represented by struct serdev_device. Fixes: 53c7626356c7 ("serdev: Add ACPI support") Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> --- Documentation/firmware-guide/acpi/enumeration.rst | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-)