Re: [PATCH 2/2] tty: serial core: use the ACPI PM state defines

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On Thu, Dec 6, 2012 at 8:40 PM, Alan Cox <alan@xxxxxxxxxxxxxxxxxxx> wrote:
> On Thu, 6 Dec 2012 20:31:15 +0100
> Linus Walleij <linus.walleij@xxxxxxxxxx> wrote:
>
>> On Thu, Dec 6, 2012 at 8:31 PM, Alan Cox <alan@xxxxxxxxxxxxxxx> wrote:
>>
>> > Almost none of the platforms using the serial driver even have ACPI so
>> > this seems to be an obfuscation of a simple numbering system for a
>> > subsystem specific set of definitions that may or may not fit in future.
>>
>> OK so we need to get away from using the ACPI numbering scheme.
>
> So whats wrong with 0 1 2 3 ?

Mainly what is wrong is the documentation that says that this correlates
to the ACPI D-states.

But we're working to get a serial driver power aware and need to
start to let device drivers go to different power states, and then
we need to let the core handle not only state 0 and 3 (as it is
using today) but also 1 and 2 (currently not used in the serial
core). And if several device drivers shall do that it could be a
good idea to have some idea of what the numbers actually
mean, roughly atleast.

Yours,
Linus Walleij
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