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

[Alan Cox <alan@linux.intel.com>]

On Thu, 6 Dec 2012 20:31:15 +0100
Linus Walleij <linus.walleij@linaro.org> wrote:

> On Thu, Dec 6, 2012 at 8:31 PM, Alan Cox <alan@linux.intel.com> 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.
> What about we define something in the <linux/tty.h> file instead
> and delete the paragraph from the documentation saying it is related
> to ACPI? (Will try this next.)

What about just using 0, 1, 2, 3 to indicate states similar to D0-D3
which as a base concept everyone is familiar with ?

If we need something more than that, then can we talk about what the
actual extra non 0/3 states needed are and how to get a generic
meaningful definition, or indeed whether a number rather than flag bits
makes sense ?

Start with the driver/platform that causes the concern and then the
rest is probably blindingly obvious.

Alan