Messages in this thread | | | Date | Wed, 15 Oct 2014 14:08:09 -0000 | Subject | Re: [PATCH v4 00/13] Add ACPI _DSD and unified device properties support | From | "David Woodhouse" <> |
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> We have been checking for all DT platforms, and that's a bug for DT. > Copying that bug to ACPI is inexcusable given we know it's a bug to do > so.
We'll, perhaps it should be named 'used-by-firmware' and actually it's just as valid under ACPI as it is on RTAS systems. All it does is stop the OS from using the port.
> I understand that. However, where a binding doesn't make sense (as in > this case), it shouldn't be enabled for ACPI as it provides a larger > surface area for misuse, for no benefit.
These are *optional* properties. They were optional precisely *because* they only make sense in some cases. I don't know that it makes sense to take them away. The benefit we get is *consistency*. For example if someone *does* use the property in question as 'used-by-firmware' and expects the OS not to touch it, we don't want that to change behaviour between ACPI and fdt boots.
-- dwmw2
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