[PATCH] PM / Domains: Fix compatible for domain idle state

[Rafael J. Wysocki]

On Thursday, December 01, 2016 10:21:59 PM Rafael J. Wysocki wrote:
> On Tuesday, November 29, 2016 09:47:03 AM Ulf Hansson wrote:
> > On 10 November 2016 at 20:58, Rob Herring <robh at kernel.org> wrote:
> > > On Mon, Nov 07, 2016 at 12:14:28PM +0100, Ulf Hansson wrote:
> > >> On 3 November 2016 at 22:54, Lina Iyer <lina.iyer at linaro.org> wrote:
> > >> > Re-using idle state definition provided by arm,idle-state for domain
> > >> > idle states creates a lot of confusion and limits further evolution of
> > >> > the domain idle definition. To keep things clear and simple, define a
> > >> > idle states for domain using a new compatible "domain-idle-state".
> > >> >
> > >> > Fix existing PM domains code to look for the newly defined compatible.
> > >> >
> > >> > Cc: <devicetree at vger.kernel.org>
> > >> > Cc: Rob Herring <robh at kernel.org>
> > >> > Signed-off-by: Lina Iyer <lina.iyer at linaro.org>
> > >> > ---
> > >> >  .../bindings/power/domain-idle-state.txt           | 33 ++++++++++++++++++++++
> > >> >  .../devicetree/bindings/power/power_domain.txt     |  8 +++---
> > >> >  drivers/base/power/domain.c                        |  2 +-
> > >> >  3 files changed, 38 insertions(+), 5 deletions(-)
> > >> >  create mode 100644 Documentation/devicetree/bindings/power/domain-idle-state.txt
> > >> >
> > >> > diff --git a/Documentation/devicetree/bindings/power/domain-idle-state.txt b/Documentation/devicetree/bindings/power/domain-idle-state.txt
> > >> > new file mode 100644
> > >> > index 0000000..eefc7ed
> > >> > --- /dev/null
> > >> > +++ b/Documentation/devicetree/bindings/power/domain-idle-state.txt
> > >> > @@ -0,0 +1,33 @@
> > >> > +PM Domain Idle State Node:
> > >> > +
> > >> > +A domain idle state node represents the state parameters that will be used to
> > >> > +select the state when there are no active components in the domain.
> > >> > +
> > >> > +The state node has the following parameters -
> > >> > +
> > >> > +- compatible:
> > >> > +       Usage: Required
> > >> > +       Value type: <string>
> > >> > +       Definition: Must be "domain-idle-state".
> > >> > +
> > >> > +- entry-latency-us
> > >> > +       Usage: Required
> > >> > +       Value type: <prop-encoded-array>
> > >> > +       Definition: u32 value representing worst case latency in
> > >> > +                   microseconds required to enter the idle state.
> > >> > +                   The exit-latency-us duration may be guaranteed
> > >> > +                   only after entry-latency-us has passed.
> > >>
> > >> As we anyway are going to change this, why not use an u64 and have the
> > >> value in ns instead of us?
> > >
> > > I can't imagine that you would need more resolution or range. For times
> > > less than 1us, s/w and register access times are going to dominate the
> > > time.
> > >
> > > Unless there is a real need, I'd keep alignment with the existing
> > > binding.
> > 
> > Rob, are you fine with this? I thought it would be great to get this
> > in for 4.10 rc1.
> 
> Rob, any objections here?

Well, no objections, so applied.

Thanks,
Rafael