acpi_device->driver_data vs acpi_device->dev.driver_data

[Werner Sembach <wse@xxxxxxxxxxxxxxxxxxx>]

Hi,

another quick learning question: Why does the acpi_device struct have a 
driver_data member in addition to the driver_data member of the nested dev?

What should each driver_data member be used for?

In contrast platform_device and wmi_device only have the dev.driver_data and not 
the top level driver data.

Kind regards,

Werner Sembach