[RFH] Power Management mini-summit during the Kernel Summit 2011

[RFH] Power Management mini-summit during the Kernel Summit 2011

[Rafael J. Wysocki]

Hi All,

There was a plan to organize a PM mini-summit during the KS 2011 in Prague,
but then I didn't follow up (which obviously is my fault) and lost track of
things when kernel.org and the KS servers went offline.  So, apparently,
the KS organizers concluded that the PM mini-summit wasn't going to happen
after all and didn't add it to the schedule.

Still, it appears to be possible to arrange a room for a PM meeting on
Sunday, Oct 23, if there are people wanting to attend.  So, if you'd like
to take part in such a meeting, please let me know ASAP.

The topics I, personally, would like to discuss include:
- Per-device PM QoS
- Propagation of wakeup events to user space vs system suspend
- Possibility of representing dependencies between devices through
  "device links" (i.e. objects representing master-slave links between
  devices)
- Idea of common "platform" bus type that may cover ACPI devices (like
  battery, fans etc.), PNP devices and current platform devices in a
  consistent way
- Freezer improvements

Thanks,
Rafael

Re: [RFH] Power Management mini-summit during the Kernel Summit 2011

[Grant Likely]

On Wed, Oct 12, 2011 at 2:11 PM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
> Hi All,
>
> There was a plan to organize a PM mini-summit during the KS 2011 in Prague,
> but then I didn't follow up (which obviously is my fault) and lost track of
> things when kernel.org and the KS servers went offline.  So, apparently,
> the KS organizers concluded that the PM mini-summit wasn't going to happen
> after all and didn't add it to the schedule.
>
> Still, it appears to be possible to arrange a room for a PM meeting on
> Sunday, Oct 23, if there are people wanting to attend.  So, if you'd like
> to take part in such a meeting, please let me know ASAP.
>
> The topics I, personally, would like to discuss include:
> - Per-device PM QoS
> - Propagation of wakeup events to user space vs system suspend
> - Possibility of representing dependencies between devices through
>  "device links" (i.e. objects representing master-slave links between
>  devices)
> - Idea of common "platform" bus type that may cover ACPI devices (like
>  battery, fans etc.), PNP devices and current platform devices in a
>  consistent way
> - Freezer improvements

I would like to attend, but I'm also in the arm maintainership
workshop.  I may be able to coordinate the schedule so that I can slip
out for the conversations that I'm interested in.  In particular, I'd
like to be part of the ACPI discussion and the device dependencies
stuff.

g.
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Re: [RFH] Power Management mini-summit during the Kernel Summit 2011

[Jean Pihet]

Hi!

On Wed, Oct 12, 2011 at 10:11 PM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
> Hi All,
>
> There was a plan to organize a PM mini-summit during the KS 2011 in Prague,
> but then I didn't follow up (which obviously is my fault) and lost track of
> things when kernel.org and the KS servers went offline.  So, apparently,
> the KS organizers concluded that the PM mini-summit wasn't going to happen
> after all and didn't add it to the schedule.
>
> Still, it appears to be possible to arrange a room for a PM meeting on
> Sunday, Oct 23, if there are people wanting to attend.  So, if you'd like
> to take part in such a meeting, please let me know ASAP.
I still do not know if I will be attendind, for various reasons. I
will let you know asap.

>
> The topics I, personally, would like to discuss include:
> - Per-device PM QoS
Since the discussion about the PM QoS user space interface(s) are
still going on I think this needs to be discussed.

I would also add the following items:
- PM QoS throughput constraints. How to handle a complex clock tree?
What should the API (kernel, user) look like?
- SmartReflex driver conversion. The current OMAP-only implementation
needs to be converted to a generic driver, possibly in drivers/power.

> - Propagation of wakeup events to user space vs system suspend
> - Possibility of representing dependencies between devices through
>  "device links" (i.e. objects representing master-slave links between
>  devices)
> - Idea of common "platform" bus type that may cover ACPI devices (like
>  battery, fans etc.), PNP devices and current platform devices in a
>  consistent way
> - Freezer improvements
>
> Thanks,
> Rafael
>

Thanks,
Jean
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Re: [RFH] Power Management mini-summit during the Kernel Summit 2011

[Greg KH]

On Wed, Oct 12, 2011 at 10:11:21PM +0200, Rafael J. Wysocki wrote:
> Hi All,
> 
> There was a plan to organize a PM mini-summit during the KS 2011 in Prague,
> but then I didn't follow up (which obviously is my fault) and lost track of
> things when kernel.org and the KS servers went offline.  So, apparently,
> the KS organizers concluded that the PM mini-summit wasn't going to happen
> after all and didn't add it to the schedule.
> 
> Still, it appears to be possible to arrange a room for a PM meeting on
> Sunday, Oct 23, if there are people wanting to attend.  So, if you'd like
> to take part in such a meeting, please let me know ASAP.

I can be there, thanks for working to put this together.

greg k-h

Re: [RFH] Power Management mini-summit during the Kernel Summit 2011

[Magnus Damm]

On Thu, Oct 13, 2011 at 5:11 AM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
> Hi All,
>
> There was a plan to organize a PM mini-summit during the KS 2011 in Prague,
> but then I didn't follow up (which obviously is my fault) and lost track of
> things when kernel.org and the KS servers went offline.  So, apparently,
> the KS organizers concluded that the PM mini-summit wasn't going to happen
> after all and didn't add it to the schedule.
>
> Still, it appears to be possible to arrange a room for a PM meeting on
> Sunday, Oct 23, if there are people wanting to attend.  So, if you'd like
> to take part in such a meeting, please let me know ASAP.

Nice to hear about a PM gathering! I'd like to join you, but at the
same time I've already committed to the ARM track. I will try to share
my time between those two somehow.

Thanks,

/ magnus
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Re: [RFH] Power Management mini-summit during the Kernel Summit 2011

[Kevin Hilman]

"Rafael J. Wysocki" <rjw@sisk.pl> writes:

> Hi All,
>
> There was a plan to organize a PM mini-summit during the KS 2011 in Prague,
> but then I didn't follow up (which obviously is my fault) and lost track of
> things when kernel.org and the KS servers went offline.  So, apparently,
> the KS organizers concluded that the PM mini-summit wasn't going to happen
> after all and didn't add it to the schedule.
>
> Still, it appears to be possible to arrange a room for a PM meeting on
> Sunday, Oct 23, if there are people wanting to attend.  So, if you'd like
> to take part in such a meeting, please let me know ASAP.

I'm very interested in attending, thanks for organizing.

However, like Grant & Magnus I have already commited to the ARM
maintainers stuff happening on Sunday.

Hopefully a schedule can be organized so that those of us attending the
ARM track can participate at least partially.

Thanks,

Kevin

Re: [RFH] Power Management mini-summit during the Kernel Summit 2011

[mark gross]

On Wed, Oct 12, 2011 at 10:11:21PM +0200, Rafael J. Wysocki wrote:
> Hi All,
> 
> There was a plan to organize a PM mini-summit during the KS 2011 in Prague,
> but then I didn't follow up (which obviously is my fault) and lost track of
> things when kernel.org and the KS servers went offline.  So, apparently,
> the KS organizers concluded that the PM mini-summit wasn't going to happen
> after all and didn't add it to the schedule.
> 
> Still, it appears to be possible to arrange a room for a PM meeting on
> Sunday, Oct 23, if there are people wanting to attend.  So, if you'd like
> to take part in such a meeting, please let me know ASAP.
> 
> The topics I, personally, would like to discuss include:
> - Per-device PM QoS
> - Propagation of wakeup events to user space vs system suspend
> - Possibility of representing dependencies between devices through
>   "device links" (i.e. objects representing master-slave links between
>   devices)
> - Idea of common "platform" bus type that may cover ACPI devices (like
>   battery, fans etc.), PNP devices and current platform devices in a
>   consistent way
> - Freezer improvements
>
I really want to go but, I just came back to work from sabbatical and I
worry my manager would have a hard time granting me travel.  I had not
requested travel to ELCE and wasn't invited to the kernel summit.

It would be really good to get more traction on these things.   If you
want I'll request authorization but, its not likely I can get there.

--mark

Re: [RFH] Power Management mini-summit during the Kernel Summit 2011

[Mark Brown]

On Wed, Oct 12, 2011 at 02:30:01PM -0600, Grant Likely wrote:

> I would like to attend, but I'm also in the arm maintainership
> workshop.  I may be able to coordinate the schedule so that I can slip
> out for the conversations that I'm interested in.  In particular, I'd
> like to be part of the ACPI discussion and the device dependencies
> stuff.

Exactly the same applies to me (and all the other people who posted).
It looks like we should just try to merge the two workshops for these
bits or something.

Re: [RFH] Power Management mini-summit during the Kernel Summit 2011

[Daniel Drake]

On Wed, Oct 12, 2011 at 9:11 PM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
> There was a plan to organize a PM mini-summit during the KS 2011 in Prague,
> but then I didn't follow up (which obviously is my fault) and lost track of
> things when kernel.org and the KS servers went offline.  So, apparently,
> the KS organizers concluded that the PM mini-summit wasn't going to happen
> after all and didn't add it to the schedule.
>
> Still, it appears to be possible to arrange a room for a PM meeting on
> Sunday, Oct 23, if there are people wanting to attend.  So, if you'd like
> to take part in such a meeting, please let me know ASAP.

Sorry - I won't be at the event, otherwise I'd definitely attend.
However, I think my colleague Chris Ball will be there, so I have CC'd
him. He has a long history of power management work at OLPC.

Anyway, I think you have an understanding of the issues facing OLPC's
power management model at the moment. We'd like to move to your wakeup
events architecture and really nail our opportunistic suspend model,
but upstreaming the support needed at the architectural level has been
a challenge that I've been working on for over a year, and still isn't
done. I think I see some influence of our remaining issues in the list
of topics you wrote below, so that's great.

> The topics I, personally, would like to discuss include:
> - Per-device PM QoS
> - Propagation of wakeup events to user space vs system suspend
> - Possibility of representing dependencies between devices through
>  "device links" (i.e. objects representing master-slave links between
>  devices)
> - Idea of common "platform" bus type that may cover ACPI devices (like
>  battery, fans etc.), PNP devices and current platform devices in a
>  consistent way
> - Freezer improvements

cheers,
Daniel
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Re: [RFH] Power Management mini-summit during the Kernel Summit 2011

[Grant Likely]

On Thu, Oct 13, 2011 at 03:55:05PM +0100, Daniel Drake wrote:
> On Wed, Oct 12, 2011 at 9:11 PM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
> > There was a plan to organize a PM mini-summit during the KS 2011 in Prague,
> > but then I didn't follow up (which obviously is my fault) and lost track of
> > things when kernel.org and the KS servers went offline.  So, apparently,
> > the KS organizers concluded that the PM mini-summit wasn't going to happen
> > after all and didn't add it to the schedule.
> >
> > Still, it appears to be possible to arrange a room for a PM meeting on
> > Sunday, Oct 23, if there are people wanting to attend.  So, if you'd like
> > to take part in such a meeting, please let me know ASAP.
> 
> Sorry - I won't be at the event, otherwise I'd definitely attend.
> However, I think my colleague Chris Ball will be there, so I have CC'd
> him. He has a long history of power management work at OLPC.

... who is also committed to the ARM workshop on that day.  :-)

Considering the number of people who have responded this way, we
should talk about either merging the meetings, or coordinating the
agenda so that the relevant folks can slip out.

g.

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Re: [RFH] Power Management mini-summit during the Kernel Summit 2011

[Grant Likely]

On Thu, Oct 13, 2011 at 09:05:17PM +0200, Rafael J. Wysocki wrote:
> On Thursday, October 13, 2011, Grant Likely wrote:
> > On Thu, Oct 13, 2011 at 03:55:05PM +0100, Daniel Drake wrote:
> > > On Wed, Oct 12, 2011 at 9:11 PM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
> > > > There was a plan to organize a PM mini-summit during the KS 2011 in Prague,
> > > > but then I didn't follow up (which obviously is my fault) and lost track of
> > > > things when kernel.org and the KS servers went offline.  So, apparently,
> > > > the KS organizers concluded that the PM mini-summit wasn't going to happen
> > > > after all and didn't add it to the schedule.
> > > >
> > > > Still, it appears to be possible to arrange a room for a PM meeting on
> > > > Sunday, Oct 23, if there are people wanting to attend.  So, if you'd like
> > > > to take part in such a meeting, please let me know ASAP.
> > > 
> > > Sorry - I won't be at the event, otherwise I'd definitely attend.
> > > However, I think my colleague Chris Ball will be there, so I have CC'd
> > > him. He has a long history of power management work at OLPC.
> > 
> > ... who is also committed to the ARM workshop on that day.  :-)
> > 
> > Considering the number of people who have responded this way, we
> > should talk about either merging the meetings, or coordinating the
> > agenda so that the relevant folks can slip out.
> 
> There are a few more people who would like to attend, but aren't
> invited to the KS or have different plans for Sunday already.
> 
> So, I wonder if it's a good idea to plan the PM meeting on a different day,
> say on Tuesday (Oct 25) or even in the LCE/ELCE time frame (although the
> schedule of those conferences is packed very tightly, so I'm afraid there
> won't be a time slot suitable to everyone in that time frame).

I've also already scheduled a boot architecture summit for Thursday afternoon.

g.

Re: [RFH] Power Management mini-summit during the Kernel Summit 2011

[Rafael J. Wysocki]

On Thursday, October 13, 2011, Grant Likely wrote:
> On Thu, Oct 13, 2011 at 03:55:05PM +0100, Daniel Drake wrote:
> > On Wed, Oct 12, 2011 at 9:11 PM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
> > > There was a plan to organize a PM mini-summit during the KS 2011 in Prague,
> > > but then I didn't follow up (which obviously is my fault) and lost track of
> > > things when kernel.org and the KS servers went offline.  So, apparently,
> > > the KS organizers concluded that the PM mini-summit wasn't going to happen
> > > after all and didn't add it to the schedule.
> > >
> > > Still, it appears to be possible to arrange a room for a PM meeting on
> > > Sunday, Oct 23, if there are people wanting to attend.  So, if you'd like
> > > to take part in such a meeting, please let me know ASAP.
> > 
> > Sorry - I won't be at the event, otherwise I'd definitely attend.
> > However, I think my colleague Chris Ball will be there, so I have CC'd
> > him. He has a long history of power management work at OLPC.
> 
> ... who is also committed to the ARM workshop on that day.  :-)
> 
> Considering the number of people who have responded this way, we
> should talk about either merging the meetings, or coordinating the
> agenda so that the relevant folks can slip out.

There are a few more people who would like to attend, but aren't
invited to the KS or have different plans for Sunday already.

So, I wonder if it's a good idea to plan the PM meeting on a different day,
say on Tuesday (Oct 25) or even in the LCE/ELCE time frame (although the
schedule of those conferences is packed very tightly, so I'm afraid there
won't be a time slot suitable to everyone in that time frame).

Thanks,
Rafael

Re: [RFH] Power Management mini-summit during the Kernel Summit 2011

[Rafael J. Wysocki]

On Thursday, October 13, 2011, Grant Likely wrote:
> On Thu, Oct 13, 2011 at 09:05:17PM +0200, Rafael J. Wysocki wrote:
> > On Thursday, October 13, 2011, Grant Likely wrote:
> > > On Thu, Oct 13, 2011 at 03:55:05PM +0100, Daniel Drake wrote:
> > > > On Wed, Oct 12, 2011 at 9:11 PM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
> > > > > There was a plan to organize a PM mini-summit during the KS 2011 in Prague,
> > > > > but then I didn't follow up (which obviously is my fault) and lost track of
> > > > > things when kernel.org and the KS servers went offline.  So, apparently,
> > > > > the KS organizers concluded that the PM mini-summit wasn't going to happen
> > > > > after all and didn't add it to the schedule.
> > > > >
> > > > > Still, it appears to be possible to arrange a room for a PM meeting on
> > > > > Sunday, Oct 23, if there are people wanting to attend.  So, if you'd like
> > > > > to take part in such a meeting, please let me know ASAP.
> > > > 
> > > > Sorry - I won't be at the event, otherwise I'd definitely attend.
> > > > However, I think my colleague Chris Ball will be there, so I have CC'd
> > > > him. He has a long history of power management work at OLPC.
> > > 
> > > ... who is also committed to the ARM workshop on that day.  :-)
> > > 
> > > Considering the number of people who have responded this way, we
> > > should talk about either merging the meetings, or coordinating the
> > > agenda so that the relevant folks can slip out.
> > 
> > There are a few more people who would like to attend, but aren't
> > invited to the KS or have different plans for Sunday already.
> > 
> > So, I wonder if it's a good idea to plan the PM meeting on a different day,
> > say on Tuesday (Oct 25) or even in the LCE/ELCE time frame (although the
> > schedule of those conferences is packed very tightly, so I'm afraid there
> > won't be a time slot suitable to everyone in that time frame).
> 
> I've also already scheduled a boot architecture summit for Thursday afternoon.

OK

So can everyone please tell me whether or not you can attend if the meeting
is scheduled on Tuesday (Oct 25) afternoon?

Rafael

Re: [RFH] Power Management mini-summit during the Kernel Summit 2011

[Greg KH]

On Thu, Oct 13, 2011 at 09:17:36PM +0200, Rafael J. Wysocki wrote:
> On Thursday, October 13, 2011, Grant Likely wrote:
> > On Thu, Oct 13, 2011 at 09:05:17PM +0200, Rafael J. Wysocki wrote:
> > > On Thursday, October 13, 2011, Grant Likely wrote:
> > > > On Thu, Oct 13, 2011 at 03:55:05PM +0100, Daniel Drake wrote:
> > > > > On Wed, Oct 12, 2011 at 9:11 PM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
> > > > > > There was a plan to organize a PM mini-summit during the KS 2011 in Prague,
> > > > > > but then I didn't follow up (which obviously is my fault) and lost track of
> > > > > > things when kernel.org and the KS servers went offline.  So, apparently,
> > > > > > the KS organizers concluded that the PM mini-summit wasn't going to happen
> > > > > > after all and didn't add it to the schedule.
> > > > > >
> > > > > > Still, it appears to be possible to arrange a room for a PM meeting on
> > > > > > Sunday, Oct 23, if there are people wanting to attend.  So, if you'd like
> > > > > > to take part in such a meeting, please let me know ASAP.
> > > > > 
> > > > > Sorry - I won't be at the event, otherwise I'd definitely attend.
> > > > > However, I think my colleague Chris Ball will be there, so I have CC'd
> > > > > him. He has a long history of power management work at OLPC.
> > > > 
> > > > ... who is also committed to the ARM workshop on that day.  :-)
> > > > 
> > > > Considering the number of people who have responded this way, we
> > > > should talk about either merging the meetings, or coordinating the
> > > > agenda so that the relevant folks can slip out.
> > > 
> > > There are a few more people who would like to attend, but aren't
> > > invited to the KS or have different plans for Sunday already.
> > > 
> > > So, I wonder if it's a good idea to plan the PM meeting on a different day,
> > > say on Tuesday (Oct 25) or even in the LCE/ELCE time frame (although the
> > > schedule of those conferences is packed very tightly, so I'm afraid there
> > > won't be a time slot suitable to everyone in that time frame).
> > 
> > I've also already scheduled a boot architecture summit for Thursday afternoon.
> 
> OK
> 
> So can everyone please tell me whether or not you can attend if the meeting
> is scheduled on Tuesday (Oct 25) afternoon?

If it doesn't conflict with kernel summit stuff, yes.

greg k-h

Re: [RFH] Power Management mini-summit during the Kernel Summit 2011

[Grant Likely]

On Thu, Oct 13, 2011 at 09:17:36PM +0200, Rafael J. Wysocki wrote:
> On Thursday, October 13, 2011, Grant Likely wrote:
> > On Thu, Oct 13, 2011 at 09:05:17PM +0200, Rafael J. Wysocki wrote:
> > > On Thursday, October 13, 2011, Grant Likely wrote:
> > > > On Thu, Oct 13, 2011 at 03:55:05PM +0100, Daniel Drake wrote:
> > > > > On Wed, Oct 12, 2011 at 9:11 PM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
> > > > > > There was a plan to organize a PM mini-summit during the KS 2011 in Prague,
> > > > > > but then I didn't follow up (which obviously is my fault) and lost track of
> > > > > > things when kernel.org and the KS servers went offline.  So, apparently,
> > > > > > the KS organizers concluded that the PM mini-summit wasn't going to happen
> > > > > > after all and didn't add it to the schedule.
> > > > > >
> > > > > > Still, it appears to be possible to arrange a room for a PM meeting on
> > > > > > Sunday, Oct 23, if there are people wanting to attend.  So, if you'd like
> > > > > > to take part in such a meeting, please let me know ASAP.
> > > > > 
> > > > > Sorry - I won't be at the event, otherwise I'd definitely attend.
> > > > > However, I think my colleague Chris Ball will be there, so I have CC'd
> > > > > him. He has a long history of power management work at OLPC.
> > > > 
> > > > ... who is also committed to the ARM workshop on that day.  :-)
> > > > 
> > > > Considering the number of people who have responded this way, we
> > > > should talk about either merging the meetings, or coordinating the
> > > > agenda so that the relevant folks can slip out.
> > > 
> > > There are a few more people who would like to attend, but aren't
> > > invited to the KS or have different plans for Sunday already.
> > > 
> > > So, I wonder if it's a good idea to plan the PM meeting on a different day,
> > > say on Tuesday (Oct 25) or even in the LCE/ELCE time frame (although the
> > > schedule of those conferences is packed very tightly, so I'm afraid there
> > > won't be a time slot suitable to everyone in that time frame).
> > 
> > I've also already scheduled a boot architecture summit for Thursday afternoon.
> 
> OK
> 
> So can everyone please tell me whether or not you can attend if the meeting
> is scheduled on Tuesday (Oct 25) afternoon?

Is there a schedule available yet for the presentations on Tuesday for kernel summit?

g.

Re: [RFH] Power Management mini-summit during the Kernel Summit 2011

[Greg KH]

On Thu, Oct 13, 2011 at 01:55:39PM -0600, Grant Likely wrote:
> On Thu, Oct 13, 2011 at 09:17:36PM +0200, Rafael J. Wysocki wrote:
> > On Thursday, October 13, 2011, Grant Likely wrote:
> > > On Thu, Oct 13, 2011 at 09:05:17PM +0200, Rafael J. Wysocki wrote:
> > > > On Thursday, October 13, 2011, Grant Likely wrote:
> > > > > On Thu, Oct 13, 2011 at 03:55:05PM +0100, Daniel Drake wrote:
> > > > > > On Wed, Oct 12, 2011 at 9:11 PM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
> > > > > > > There was a plan to organize a PM mini-summit during the KS 2011 in Prague,
> > > > > > > but then I didn't follow up (which obviously is my fault) and lost track of
> > > > > > > things when kernel.org and the KS servers went offline.  So, apparently,
> > > > > > > the KS organizers concluded that the PM mini-summit wasn't going to happen
> > > > > > > after all and didn't add it to the schedule.
> > > > > > >
> > > > > > > Still, it appears to be possible to arrange a room for a PM meeting on
> > > > > > > Sunday, Oct 23, if there are people wanting to attend.  So, if you'd like
> > > > > > > to take part in such a meeting, please let me know ASAP.
> > > > > > 
> > > > > > Sorry - I won't be at the event, otherwise I'd definitely attend.
> > > > > > However, I think my colleague Chris Ball will be there, so I have CC'd
> > > > > > him. He has a long history of power management work at OLPC.
> > > > > 
> > > > > ... who is also committed to the ARM workshop on that day.  :-)
> > > > > 
> > > > > Considering the number of people who have responded this way, we
> > > > > should talk about either merging the meetings, or coordinating the
> > > > > agenda so that the relevant folks can slip out.
> > > > 
> > > > There are a few more people who would like to attend, but aren't
> > > > invited to the KS or have different plans for Sunday already.
> > > > 
> > > > So, I wonder if it's a good idea to plan the PM meeting on a different day,
> > > > say on Tuesday (Oct 25) or even in the LCE/ELCE time frame (although the
> > > > schedule of those conferences is packed very tightly, so I'm afraid there
> > > > won't be a time slot suitable to everyone in that time frame).
> > > 
> > > I've also already scheduled a boot architecture summit for Thursday afternoon.
> > 
> > OK
> > 
> > So can everyone please tell me whether or not you can attend if the meeting
> > is scheduled on Tuesday (Oct 25) afternoon?
> 
> Is there a schedule available yet for the presentations on Tuesday for kernel summit?

We just finalized it yesterday, but I don't think anyone has made it
public.  I'll go ask...

greg k-h

Re: [RFH] Power Management mini-summit during the Kernel Summit 2011

[Jean Pihet]

Hi Rafael,

On Thu, Oct 13, 2011 at 9:17 PM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
> On Thursday, October 13, 2011, Grant Likely wrote:
>> On Thu, Oct 13, 2011 at 09:05:17PM +0200, Rafael J. Wysocki wrote:
>> > On Thursday, October 13, 2011, Grant Likely wrote:
>> > > On Thu, Oct 13, 2011 at 03:55:05PM +0100, Daniel Drake wrote:
>> > > > On Wed, Oct 12, 2011 at 9:11 PM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
>> > > > > There was a plan to organize a PM mini-summit during the KS 2011 in Prague,
>> > > > > but then I didn't follow up (which obviously is my fault) and lost track of
>> > > > > things when kernel.org and the KS servers went offline.  So, apparently,
>> > > > > the KS organizers concluded that the PM mini-summit wasn't going to happen
>> > > > > after all and didn't add it to the schedule.
>> > > > >
>> > > > > Still, it appears to be possible to arrange a room for a PM meeting on
>> > > > > Sunday, Oct 23, if there are people wanting to attend.  So, if you'd like
>> > > > > to take part in such a meeting, please let me know ASAP.
>> > > >
>> > > > Sorry - I won't be at the event, otherwise I'd definitely attend.
>> > > > However, I think my colleague Chris Ball will be there, so I have CC'd
>> > > > him. He has a long history of power management work at OLPC.
>> > >
>> > > ... who is also committed to the ARM workshop on that day.  :-)
>> > >
>> > > Considering the number of people who have responded this way, we
>> > > should talk about either merging the meetings, or coordinating the
>> > > agenda so that the relevant folks can slip out.
>> >
>> > There are a few more people who would like to attend, but aren't
>> > invited to the KS or have different plans for Sunday already.
>> >
>> > So, I wonder if it's a good idea to plan the PM meeting on a different day,
>> > say on Tuesday (Oct 25) or even in the LCE/ELCE time frame (although the
>> > schedule of those conferences is packed very tightly, so I'm afraid there
>> > won't be a time slot suitable to everyone in that time frame).
>>
>> I've also already scheduled a boot architecture summit for Thursday afternoon.
>
> OK
>
> So can everyone please tell me whether or not you can attend if the meeting
> is scheduled on Tuesday (Oct 25) afternoon?
Yes I can attend but I am not invited to KS. Is that an issue to
follow the PM session only?

Thanks for organizing it!
Jean

>
> Rafael
>
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Re: [RFH] Power Management mini-summit during the Kernel Summit 2011

[Kevin Hilman]

"Rafael J. Wysocki" <rjw@sisk.pl> writes:

> So can everyone please tell me whether or not you can attend if the
> meeting is scheduled on Tuesday (Oct 25) afternoon?

Works for me, since I'm not invited to the rest of KS.

Kevin

Re: [RFH] Power Management mini-summit during the Kernel Summit 2011

[Rafael J. Wysocki]

On Thursday, October 13, 2011, Jean Pihet wrote:
> Hi Rafael,
> 
> On Thu, Oct 13, 2011 at 9:17 PM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
> > On Thursday, October 13, 2011, Grant Likely wrote:
> >> On Thu, Oct 13, 2011 at 09:05:17PM +0200, Rafael J. Wysocki wrote:
> >> > On Thursday, October 13, 2011, Grant Likely wrote:
> >> > > On Thu, Oct 13, 2011 at 03:55:05PM +0100, Daniel Drake wrote:
> >> > > > On Wed, Oct 12, 2011 at 9:11 PM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
> >> > > > > There was a plan to organize a PM mini-summit during the KS 2011 in Prague,
> >> > > > > but then I didn't follow up (which obviously is my fault) and lost track of
> >> > > > > things when kernel.org and the KS servers went offline.  So, apparently,
> >> > > > > the KS organizers concluded that the PM mini-summit wasn't going to happen
> >> > > > > after all and didn't add it to the schedule.
> >> > > > >
> >> > > > > Still, it appears to be possible to arrange a room for a PM meeting on
> >> > > > > Sunday, Oct 23, if there are people wanting to attend.  So, if you'd like
> >> > > > > to take part in such a meeting, please let me know ASAP.
> >> > > >
> >> > > > Sorry - I won't be at the event, otherwise I'd definitely attend.
> >> > > > However, I think my colleague Chris Ball will be there, so I have CC'd
> >> > > > him. He has a long history of power management work at OLPC.
> >> > >
> >> > > ... who is also committed to the ARM workshop on that day.  :-)
> >> > >
> >> > > Considering the number of people who have responded this way, we
> >> > > should talk about either merging the meetings, or coordinating the
> >> > > agenda so that the relevant folks can slip out.
> >> >
> >> > There are a few more people who would like to attend, but aren't
> >> > invited to the KS or have different plans for Sunday already.
> >> >
> >> > So, I wonder if it's a good idea to plan the PM meeting on a different day,
> >> > say on Tuesday (Oct 25) or even in the LCE/ELCE time frame (although the
> >> > schedule of those conferences is packed very tightly, so I'm afraid there
> >> > won't be a time slot suitable to everyone in that time frame).
> >>
> >> I've also already scheduled a boot architecture summit for Thursday afternoon.
> >
> > OK
> >
> > So can everyone please tell me whether or not you can attend if the meeting
> > is scheduled on Tuesday (Oct 25) afternoon?
> Yes I can attend but I am not invited to KS. Is that an issue to
> follow the PM session only?

No, it's not, if you're going to be around at the right time. :-)

Thanks,
Rafael

Re: [RFH] Power Management mini-summit during the Kernel Summit 2011

[Rafael J. Wysocki]

On Thursday, October 13, 2011, Greg KH wrote:
> On Thu, Oct 13, 2011 at 01:55:39PM -0600, Grant Likely wrote:
> > On Thu, Oct 13, 2011 at 09:17:36PM +0200, Rafael J. Wysocki wrote:
> > > On Thursday, October 13, 2011, Grant Likely wrote:
> > > > On Thu, Oct 13, 2011 at 09:05:17PM +0200, Rafael J. Wysocki wrote:
> > > > > On Thursday, October 13, 2011, Grant Likely wrote:
> > > > > > On Thu, Oct 13, 2011 at 03:55:05PM +0100, Daniel Drake wrote:
> > > > > > > On Wed, Oct 12, 2011 at 9:11 PM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
> > > > > > > > There was a plan to organize a PM mini-summit during the KS 2011 in Prague,
> > > > > > > > but then I didn't follow up (which obviously is my fault) and lost track of
> > > > > > > > things when kernel.org and the KS servers went offline.  So, apparently,
> > > > > > > > the KS organizers concluded that the PM mini-summit wasn't going to happen
> > > > > > > > after all and didn't add it to the schedule.
> > > > > > > >
> > > > > > > > Still, it appears to be possible to arrange a room for a PM meeting on
> > > > > > > > Sunday, Oct 23, if there are people wanting to attend.  So, if you'd like
> > > > > > > > to take part in such a meeting, please let me know ASAP.
> > > > > > > 
> > > > > > > Sorry - I won't be at the event, otherwise I'd definitely attend.
> > > > > > > However, I think my colleague Chris Ball will be there, so I have CC'd
> > > > > > > him. He has a long history of power management work at OLPC.
> > > > > > 
> > > > > > ... who is also committed to the ARM workshop on that day.  :-)
> > > > > > 
> > > > > > Considering the number of people who have responded this way, we
> > > > > > should talk about either merging the meetings, or coordinating the
> > > > > > agenda so that the relevant folks can slip out.
> > > > > 
> > > > > There are a few more people who would like to attend, but aren't
> > > > > invited to the KS or have different plans for Sunday already.
> > > > > 
> > > > > So, I wonder if it's a good idea to plan the PM meeting on a different day,
> > > > > say on Tuesday (Oct 25) or even in the LCE/ELCE time frame (although the
> > > > > schedule of those conferences is packed very tightly, so I'm afraid there
> > > > > won't be a time slot suitable to everyone in that time frame).
> > > > 
> > > > I've also already scheduled a boot architecture summit for Thursday afternoon.
> > > 
> > > OK
> > > 
> > > So can everyone please tell me whether or not you can attend if the meeting
> > > is scheduled on Tuesday (Oct 25) afternoon?
> > 
> > Is there a schedule available yet for the presentations on Tuesday for kernel summit?
> 
> We just finalized it yesterday, but I don't think anyone has made it
> public.  I'll go ask...

It looks like a key-signing party is scheduled at 16:30 and then there's
the evening event with buses leaving at 18:15 (most likely).  So there
seems to be some free time between 5 PM and 6 PM.  I wonder if that's
going to be sufficient?

Rafael

Re: [RFH] Power Management mini-summit during the Kernel Summit 2011

[Magnus Damm]

On Fri, Oct 14, 2011 at 6:26 AM, Kevin Hilman <khilman@ti.com> wrote:
> "Rafael J. Wysocki" <rjw@sisk.pl> writes:
>
>> So can everyone please tell me whether or not you can attend if the
>> meeting is scheduled on Tuesday (Oct 25) afternoon?
>
> Works for me, since I'm not invited to the rest of KS.

Same here, but I do believe that KS on Tuesday is open for everyone -
or at least people attending the Sunday events.

Cheers,

/ magnus

Re: [RFH] Power Management mini-summit during the Kernel Summit 2011

[Grant Likely]

On Thu, Oct 13, 2011 at 11:33:11PM +0200, Rafael J. Wysocki wrote:
> On Thursday, October 13, 2011, Greg KH wrote:
> > On Thu, Oct 13, 2011 at 01:55:39PM -0600, Grant Likely wrote:
> > > Is there a schedule available yet for the presentations on Tuesday for kernel summit?
> > 
> > We just finalized it yesterday, but I don't think anyone has made it
> > public.  I'll go ask...
> 
> It looks like a key-signing party is scheduled at 16:30 and then there's
> the evening event with buses leaving at 18:15 (most likely).  So there
> seems to be some free time between 5 PM and 6 PM.  I wonder if that's
> going to be sufficient?

Ugh; please don't do that.  There is no way it will be sufficient
time, it will make everything rushed, and we'll all be mostly burnt
out by then anyway.

g.

Re: [RFH] Power Management mini-summit during the Kernel Summit 2011

[Grant Likely]

On Fri, Oct 14, 2011 at 06:50:54AM +0900, Magnus Damm wrote:
> On Fri, Oct 14, 2011 at 6:26 AM, Kevin Hilman <khilman@ti.com> wrote:
> > "Rafael J. Wysocki" <rjw@sisk.pl> writes:
> >
> >> So can everyone please tell me whether or not you can attend if the
> >> meeting is scheduled on Tuesday (Oct 25) afternoon?
> >
> > Works for me, since I'm not invited to the rest of KS.
> 
> Same here, but I do believe that KS on Tuesday is open for everyone -
> or at least people attending the Sunday events.

Yes, the tuesday is open to all WS attendees.  I'll be sending out a
schedule and logistics for the ARM WS in the next couple of days.

g.

Re: [RFH] Power Management mini-summit during the Kernel Summit 2011

[Rafael J. Wysocki]

On Friday, October 14, 2011, Grant Likely wrote:
> On Thu, Oct 13, 2011 at 11:33:11PM +0200, Rafael J. Wysocki wrote:
> > On Thursday, October 13, 2011, Greg KH wrote:
> > > On Thu, Oct 13, 2011 at 01:55:39PM -0600, Grant Likely wrote:
> > > > Is there a schedule available yet for the presentations on Tuesday for kernel summit?
> > > 
> > > We just finalized it yesterday, but I don't think anyone has made it
> > > public.  I'll go ask...
> > 
> > It looks like a key-signing party is scheduled at 16:30 and then there's
> > the evening event with buses leaving at 18:15 (most likely).  So there
> > seems to be some free time between 5 PM and 6 PM.  I wonder if that's
> > going to be sufficient?
> 
> Ugh; please don't do that.  There is no way it will be sufficient
> time, it will make everything rushed, and we'll all be mostly burnt
> out by then anyway.

In that case I don't think we can find any suitable time frame at all,
at least not right now.

Thanks,
Rafael

Re: [RFH] Power Management mini-summit during the Kernel Summit 2011

[Grant Likely]

On Sun, Oct 16, 2011 at 12:35:34AM +0200, Rafael J. Wysocki wrote:
> On Friday, October 14, 2011, Grant Likely wrote:
> > On Thu, Oct 13, 2011 at 11:33:11PM +0200, Rafael J. Wysocki wrote:
> > > On Thursday, October 13, 2011, Greg KH wrote:
> > > > On Thu, Oct 13, 2011 at 01:55:39PM -0600, Grant Likely wrote:
> > > > > Is there a schedule available yet for the presentations on Tuesday for kernel summit?
> > > > 
> > > > We just finalized it yesterday, but I don't think anyone has made it
> > > > public.  I'll go ask...
> > > 
> > > It looks like a key-signing party is scheduled at 16:30 and then there's
> > > the evening event with buses leaving at 18:15 (most likely).  So there
> > > seems to be some free time between 5 PM and 6 PM.  I wonder if that's
> > > going to be sufficient?
> > 
> > Ugh; please don't do that.  There is no way it will be sufficient
> > time, it will make everything rushed, and we'll all be mostly burnt
> > out by then anyway.
> 
> In that case I don't think we can find any suitable time frame at all,
> at least not right now.

Send me this list of topics that you have.  Some of them are relevant
to the ARM community, and we can fit them into the ARM workshop which
your are more than welcome to attend.

g.

Re: [RFH] Power Management mini-summit during the Kernel Summit 2011

[Rafael J. Wysocki]

On Sunday, October 16, 2011, Grant Likely wrote:
> On Sun, Oct 16, 2011 at 12:35:34AM +0200, Rafael J. Wysocki wrote:
> > On Friday, October 14, 2011, Grant Likely wrote:
> > > On Thu, Oct 13, 2011 at 11:33:11PM +0200, Rafael J. Wysocki wrote:
> > > > On Thursday, October 13, 2011, Greg KH wrote:
> > > > > On Thu, Oct 13, 2011 at 01:55:39PM -0600, Grant Likely wrote:
> > > > > > Is there a schedule available yet for the presentations on Tuesday for kernel summit?
> > > > > 
> > > > > We just finalized it yesterday, but I don't think anyone has made it
> > > > > public.  I'll go ask...
> > > > 
> > > > It looks like a key-signing party is scheduled at 16:30 and then there's
> > > > the evening event with buses leaving at 18:15 (most likely).  So there
> > > > seems to be some free time between 5 PM and 6 PM.  I wonder if that's
> > > > going to be sufficient?
> > > 
> > > Ugh; please don't do that.  There is no way it will be sufficient
> > > time, it will make everything rushed, and we'll all be mostly burnt
> > > out by then anyway.
> > 
> > In that case I don't think we can find any suitable time frame at all,
> > at least not right now.
> 
> Send me this list of topics that you have.  Some of them are relevant
> to the ARM community, and we can fit them into the ARM workshop which
> your are more than welcome to attend.

My topics are, more or less:

- Handling off-the-tree dependencies of devices.
- Per-device PM QoS (most importantly, how it is supposed to interact with user
  space).
- Universal platform drivers idea (common bus type for ACPI, PNP and "platform"
  devices).
- Suspend vs wakeup events.

Thanks,
Rafael

Re: [RFH] Power Management mini-summit during the Kernel Summit 2011

[joeyli]

Hi Rafael, 

於 日，2011-10-16 於 16:42 +0200，Rafael J. Wysocki 提到：
> On Sunday, October 16, 2011, Grant Likely wrote:
> > On Sun, Oct 16, 2011 at 12:35:34AM +0200, Rafael J. Wysocki wrote:
> > > On Friday, October 14, 2011, Grant Likely wrote:
> > > > On Thu, Oct 13, 2011 at 11:33:11PM +0200, Rafael J. Wysocki wrote:
> > > > > On Thursday, October 13, 2011, Greg KH wrote:
> > > > > > On Thu, Oct 13, 2011 at 01:55:39PM -0600, Grant Likely wrote:
> > > > > > > Is there a schedule available yet for the presentations on Tuesday for kernel summit?
> > > > > > 
> > > > > > We just finalized it yesterday, but I don't think anyone has made it
> > > > > > public.  I'll go ask...
> > > > > 
> > > > > It looks like a key-signing party is scheduled at 16:30 and then there's
> > > > > the evening event with buses leaving at 18:15 (most likely).  So there
> > > > > seems to be some free time between 5 PM and 6 PM.  I wonder if that's
> > > > > going to be sufficient?
> > > > 
> > > > Ugh; please don't do that.  There is no way it will be sufficient
> > > > time, it will make everything rushed, and we'll all be mostly burnt
> > > > out by then anyway.
> > > 
> > > In that case I don't think we can find any suitable time frame at all,
> > > at least not right now.
> > 
> > Send me this list of topics that you have.  Some of them are relevant
> > to the ARM community, and we can fit them into the ARM workshop which
> > your are more than welcome to attend.
> 
> My topics are, more or less:
> 
> - Handling off-the-tree dependencies of devices.
> - Per-device PM QoS (most importantly, how it is supposed to interact with user
>   space).
> - Universal platform drivers idea (common bus type for ACPI, PNP and "platform"
>   devices).
> - Suspend vs wakeup events.
> 
> Thanks,
> Rafael
> --
> To unsubscribe from this list: send the line "unsubscribe linux-acpi" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

The above topics are interesting!

Did you have plan to public the meeting minutes of PM mini-summit or
have any web page to simply write down conclusion? That will be good to
anybody cann't join but want to know more detail.


Thank's a lot!
Joey Lee

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Re: [RFH] Power Management mini-summit during the Kernel Summit 2011

[Grant Likely]

On Sun, Oct 16, 2011 at 8:42 AM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
> On Sunday, October 16, 2011, Grant Likely wrote:
>> Send me this list of topics that you have.  Some of them are relevant
>> to the ARM community, and we can fit them into the ARM workshop which
>> your are more than welcome to attend.
>
> My topics are, more or less:
>
> - Handling off-the-tree dependencies of devices.
> - Per-device PM QoS (most importantly, how it is supposed to interact with user
>  space).
> - Universal platform drivers idea (common bus type for ACPI, PNP and "platform"
>  devices).
> - Suspend vs wakeup events.

Okay, I think these are interesting and I've added them to the list.
I'm hoping to meet with Nicolas and Arnd tomorrow to hammer out the
schedule for Sunday.  You'll be able to find it here[1] when it is
complete.

[1] http://elinux.org/Events/Kernel_Summit_2011_ARM_Subarch_Maintainership_Workshop

Also, since the topic was mentioned, I'd like to take this oportunity
to jot down my thoughts about the universal platform drivers topic.  I
was talking to Matthew Garret about this exact thing in Vancouver when
we were comparing the ACPI and FDT implementations in the kernel, and
I was noticing that they use a very similar data model.  However,
about a year ago the FDT-specific bus type was eliminated and we moved
to the model where an FDT node pointer can be attached to any struct
device; regardless of bus_type.  It turned out to make a great deal of
sense because nodes in the device tree could be any kind of device;
i2c, spi, platform, usb, pci, etc.  With this model, there doesn't
need to be a different driver for each data source (static
registration, or FDT, or whatever).  A single platform_driver (or
i2c_driver, or spi_driver) could handle all data sources. I think it
is a very useful model to treat data provided by firmware as
supplemental data that can either create or be attached to any device
in the system, but does not have a 1:1 mapping from the firmware
structure to the Linux internal device hierarchy.

Also, since there are strong similarities between the ACPI and FDT
models, I'd like to investigate sharing core infrastructure code
between the subsystems.  From the quick look that Matthew and I had, I
think it is certainly possible.

g.
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Re: [RFH] Power Management mini-summit during the Kernel Summit 2011

[Rafael J. Wysocki]

On Monday, October 17, 2011, joeyli wrote:
> Hi Rafael, 
> 
> 於 日，2011-10-16 於 16:42 +0200，Rafael J. Wysocki 提到：
> > On Sunday, October 16, 2011, Grant Likely wrote:
> > > On Sun, Oct 16, 2011 at 12:35:34AM +0200, Rafael J. Wysocki wrote:
> > > > On Friday, October 14, 2011, Grant Likely wrote:
> > > > > On Thu, Oct 13, 2011 at 11:33:11PM +0200, Rafael J. Wysocki wrote:
> > > > > > On Thursday, October 13, 2011, Greg KH wrote:
> > > > > > > On Thu, Oct 13, 2011 at 01:55:39PM -0600, Grant Likely wrote:
> > > > > > > > Is there a schedule available yet for the presentations on Tuesday for kernel summit?
> > > > > > > 
> > > > > > > We just finalized it yesterday, but I don't think anyone has made it
> > > > > > > public.  I'll go ask...
> > > > > > 
> > > > > > It looks like a key-signing party is scheduled at 16:30 and then there's
> > > > > > the evening event with buses leaving at 18:15 (most likely).  So there
> > > > > > seems to be some free time between 5 PM and 6 PM.  I wonder if that's
> > > > > > going to be sufficient?
> > > > > 
> > > > > Ugh; please don't do that.  There is no way it will be sufficient
> > > > > time, it will make everything rushed, and we'll all be mostly burnt
> > > > > out by then anyway.
> > > > 
> > > > In that case I don't think we can find any suitable time frame at all,
> > > > at least not right now.
> > > 
> > > Send me this list of topics that you have.  Some of them are relevant
> > > to the ARM community, and we can fit them into the ARM workshop which
> > > your are more than welcome to attend.
> > 
> > My topics are, more or less:
> > 
> > - Handling off-the-tree dependencies of devices.
> > - Per-device PM QoS (most importantly, how it is supposed to interact with user
> >   space).
> > - Universal platform drivers idea (common bus type for ACPI, PNP and "platform"
> >   devices).
> > - Suspend vs wakeup events.
> > 
> > Thanks,
> > Rafael
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-acpi" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 
> The above topics are interesting!
> 
> Did you have plan to public the meeting minutes of PM mini-summit or
> have any web page to simply write down conclusion? That will be good to
> anybody cann't join but want to know more detail.

Yes, I think we should publish the meeting minutes this way or another,
if we have the meeting eventually, that is.

Thanks,
Rafael
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Re: [RFH] Power Management mini-summit during the Kernel Summit 2011

[Rafael J. Wysocki]

On Monday, October 17, 2011, Grant Likely wrote:
> On Sun, Oct 16, 2011 at 8:42 AM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
> > On Sunday, October 16, 2011, Grant Likely wrote:
> >> Send me this list of topics that you have.  Some of them are relevant
> >> to the ARM community, and we can fit them into the ARM workshop which
> >> your are more than welcome to attend.
> >
> > My topics are, more or less:
> >
> > - Handling off-the-tree dependencies of devices.
> > - Per-device PM QoS (most importantly, how it is supposed to interact with user
> >  space).
> > - Universal platform drivers idea (common bus type for ACPI, PNP and "platform"
> >  devices).
> > - Suspend vs wakeup events.
> 
> Okay, I think these are interesting and I've added them to the list.
> I'm hoping to meet with Nicolas and Arnd tomorrow to hammer out the
> schedule for Sunday.  You'll be able to find it here[1] when it is
> complete.
> 
> [1] http://elinux.org/Events/Kernel_Summit_2011_ARM_Subarch_Maintainership_Workshop
> 
> Also, since the topic was mentioned, I'd like to take this oportunity
> to jot down my thoughts about the universal platform drivers topic.  I
> was talking to Matthew Garret about this exact thing in Vancouver when
> we were comparing the ACPI and FDT implementations in the kernel, and
> I was noticing that they use a very similar data model.  However,
> about a year ago the FDT-specific bus type was eliminated and we moved
> to the model where an FDT node pointer can be attached to any struct
> device; regardless of bus_type.  It turned out to make a great deal of
> sense because nodes in the device tree could be any kind of device;
> i2c, spi, platform, usb, pci, etc.  With this model, there doesn't
> need to be a different driver for each data source (static
> registration, or FDT, or whatever).  A single platform_driver (or
> i2c_driver, or spi_driver) could handle all data sources. I think it
> is a very useful model to treat data provided by firmware as
> supplemental data that can either create or be attached to any device
> in the system, but does not have a 1:1 mapping from the firmware
> structure to the Linux internal device hierarchy.
> 
> Also, since there are strong similarities between the ACPI and FDT
> models, I'd like to investigate sharing core infrastructure code
> between the subsystems.  From the quick look that Matthew and I had, I
> think it is certainly possible.

I agree and that's why I'd like to discuss those things.

Thanks,
Rafael