On Thu, Apr 16, 2020 at 11:27 AM Wolfgang Wallner wolfgang.wallner@br-automation.com wrote:
-----"Andy Shevchenko" andy.shevchenko@gmail.com schrieb: -----
[snip]
- acpi,compatible : ACPI devices may report a _HID or _CID of
"PRP0001", in
which case they are expected to provide a _DSD object with a"compatible"
property.No, this is simple incorrect. PRP0001 should not be mentioned at all. _DSD() as I said in the other thread is orthogonal to the ACPI ID.
Can "acpi,compatible" work in another way (without PRP0001)? Or do you mean that "acpi,compatible" can't work at all?
Oh yeah, it can't work, unfortunately.
So, compatible enumeration depends on PRP0001, which may not be advertised for the products, while end users can do that on their own. So, we may only generate ACPI excerpts for the devices that have an official ID allocated.
As far as I see PRP0001 would be the only way to pass a "compatible" property in ACPI.