devicetree in arm

devicetree in arm

[Mark Ryden]

Hello,
According to :
http://lwn.net/Articles/375296/
Some patches that add basic ARM device tree support
were sent,

In the link above, there is a link to a git tree here:
git://git.secretlab.ca/git/linux-2.6 test-devicetree

I git-cloned this tree, and I don't have arch/arm/kernel/devtree.c

Am I missing something ?

Rgs,
Mark

devicetree in arm

[Grant Likely]

On Thu, Mar 18, 2010 at 6:04 AM, Mark Ryden <markryde@gmail.com> wrote:
> Hello,
> According to :
> http://lwn.net/Articles/375296/
> Some patches that add basic ARM device tree support
> were sent,
>
> In the link above, there is a link to a git tree here:
> git://git.secretlab.ca/git/linux-2.6 test-devicetree
>
> I git-cloned this tree, and I don't have arch/arm/kernel/devtree.c
>
> Am I missing something ?

ARM device tree support is very much in flux, and that particular
branch gets rebased a lot as device tree code from Sparc, Microblaze
and Powerpc is merged into drivers/of.  I may have ended up pushing
out to test-devicetree without the ARM patches applied.  I'll look at
it today, make sure the ARM stuff is all there, and then push it out
again.

Note however that this is only very basic support.  It doesn't yet
have the code needed to register devices and drivers from device tree
data.  That will be coming real-soon-now.

g.

devicetree in arm

[Russell King - ARM Linux]

On Thu, Mar 18, 2010 at 07:14:05AM -0600, Grant Likely wrote:
> ARM device tree support is very much in flux, and that particular
> branch gets rebased a lot as device tree code from Sparc, Microblaze
> and Powerpc is merged into drivers/of.  I may have ended up pushing
> out to test-devicetree without the ARM patches applied.  I'll look at
> it today, make sure the ARM stuff is all there, and then push it out
> again.
> 
> Note however that this is only very basic support.  It doesn't yet
> have the code needed to register devices and drivers from device tree
> data.  That will be coming real-soon-now.

Is someone going to do a device tree example port to a 'real' platform
rather than simple the ARM evaluation boards?

As I've said previously, I'm not going to accept device tree stuff until
I see a working implementation on a set of real platforms.

devicetree in arm

[Armando VISCONTI]

Russell,


>> ARM device tree support is very much in flux, and that particular
>> branch gets rebased a lot as device tree code from Sparc, Microblaze
>> and Powerpc is merged into drivers/of.  I may have ended up pushing
>> out to test-devicetree without the ARM patches applied.  I'll look at
>> it today, make sure the ARM stuff is all there, and then push it out
>> again.
>>
>> Note however that this is only very basic support.  It doesn't yet
>> have the code needed to register devices and drivers from device tree
>> data.  That will be coming real-soon-now.
>>     
>
> Is someone going to do a device tree example port to a 'real' platform
> rather than simple the ARM evaluation boards?
>   
As part of the discussion we had recently with you guys I can tell you
that we are of course interested into this devicetree info passed
as booting option.

We are currently in the process of submitting on this mailing list
the patch V2 for SPEAr family architectures for reviewing.

> As I've said previously, I'm not going to accept device tree stuff until
> I see a working implementation on a set of real platforms.
>   
Just after submitting patch V2 we might take a look to this patch and 
try it out
on our SPEAr platforms. It might take long as it is not exactly
our first priority.

We will keep you informed on this.

Regards,
Arm

devicetree in arm

[Grant Likely]

On Thu, Mar 18, 2010 at 7:23 AM, Russell King - ARM Linux
<linux@arm.linux.org.uk> wrote:
> On Thu, Mar 18, 2010 at 07:14:05AM -0600, Grant Likely wrote:
>> ARM device tree support is very much in flux, and that particular
>> branch gets rebased a lot as device tree code from Sparc, Microblaze
>> and Powerpc is merged into drivers/of. ?I may have ended up pushing
>> out to test-devicetree without the ARM patches applied. ?I'll look at
>> it today, make sure the ARM stuff is all there, and then push it out
>> again.
>>
>> Note however that this is only very basic support. ?It doesn't yet
>> have the code needed to register devices and drivers from device tree
>> data. ?That will be coming real-soon-now.
>
> Is someone going to do a device tree example port to a 'real' platform
> rather than simple the ARM evaluation boards?

I'm working on OMAP and others, and Jeremy is working on i.MX51
targeting real product.  Visible progress has been slow since there is
a lot more back end infrastructure work than I was expecting to get
the ppc, sparc and microblaze code merged into a common code base and
to move away from the whole of_platform bus stuff (so that regular
platform drivers work).  The alternative would be to add yet another
duplicate copy of device tree code to ARM which I will not do, and I
know you wouldn't accept anyway.  :-)

g.

-- 
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.

devicetree in arm

[Jason McMullan]

I'm also interested in the Device Tree for ARM.

We're planning on having several devices with the same basic
layout, but several stuffing options. It would be preferable
to have a Device Tree blob that the bootloader can pass to
a generic kernel, instead of allocating several ARM Machine
IDs, one for each layout.

I've been watching these threads, and am eager to start
using the combined infrastructure once it becomes widely
available.

--
Jason McMullan
Netronome Systems

devicetree in arm

[Bill Gatliff]

Russell King - ARM Linux wrote:
> On Thu, Mar 18, 2010 at 07:14:05AM -0600, Grant Likely wrote:
>   
>> ARM device tree support is very much in flux, and that particular
>> branch gets rebased a lot as device tree code from Sparc, Microblaze
>> and Powerpc is merged into drivers/of.  I may have ended up pushing
>> out to test-devicetree without the ARM patches applied.  I'll look at
>> it today, make sure the ARM stuff is all there, and then push it out
>> again.
>>
>> Note however that this is only very basic support.  It doesn't yet
>> have the code needed to register devices and drivers from device tree
>> data.  That will be coming real-soon-now.
>>     
>
> Is someone going to do a device tree example port to a 'real' platform
> rather than simple the ARM evaluation boards?
>
> As I've said previously, I'm not going to accept device tree stuff until
> I see a working implementation on a set of real platforms.
>   

I can give it a spin on a couple of the boards I have here.  I'm already
using device trees on my PPC platforms.


b.g.

-- 
Bill Gatliff
bgat at billgatliff.com

devicetree in arm

[Grant Likely]

On Thu, Mar 18, 2010 at 2:24 PM, Bill Gatliff <bgat@billgatliff.com> wrote:
> Russell King - ARM Linux wrote:
>> On Thu, Mar 18, 2010 at 07:14:05AM -0600, Grant Likely wrote:
>>
>>> ARM device tree support is very much in flux, and that particular
>>> branch gets rebased a lot as device tree code from Sparc, Microblaze
>>> and Powerpc is merged into drivers/of. ?I may have ended up pushing
>>> out to test-devicetree without the ARM patches applied. ?I'll look at
>>> it today, make sure the ARM stuff is all there, and then push it out
>>> again.
>>>
>>> Note however that this is only very basic support. ?It doesn't yet
>>> have the code needed to register devices and drivers from device tree
>>> data. ?That will be coming real-soon-now.
>>>
>>
>> Is someone going to do a device tree example port to a 'real' platform
>> rather than simple the ARM evaluation boards?
>>
>> As I've said previously, I'm not going to accept device tree stuff until
>> I see a working implementation on a set of real platforms.
>>
>
> I can give it a spin on a couple of the boards I have here. ?I'm already
> using device trees on my PPC platforms.

Hi Bill.  I've just pushed out my tree with a bit of the device tree
probing working on the versatile platform.  It works with the QEMU
branch that Jeremy Kerr is maintaining.  Here are the git trees, and
the web page that describes how to build it:

git://git.secretlab.ca/git/linux-2.6 test-devicetree
git://git://kernel.ubuntu.com/jk/dt/qemu.git
https://wiki.ubuntu.com/KernelTeam/ARMDeviceTrees

I've got stuff working on real hardware too, but it's not fully baked
yet.  Right now qemu is the least trouble.

g.

devicetree in arm

[Bryan Wu]

Grant Likely wrote:
> On Thu, Mar 18, 2010 at 2:24 PM, Bill Gatliff <bgat@billgatliff.com> wrote:
>   
>> Russell King - ARM Linux wrote:
>>     
>>> On Thu, Mar 18, 2010 at 07:14:05AM -0600, Grant Likely wrote:
>>>
>>>       
>>>> ARM device tree support is very much in flux, and that particular
>>>> branch gets rebased a lot as device tree code from Sparc, Microblaze
>>>> and Powerpc is merged into drivers/of.  I may have ended up pushing
>>>> out to test-devicetree without the ARM patches applied.  I'll look at
>>>> it today, make sure the ARM stuff is all there, and then push it out
>>>> again.
>>>>
>>>> Note however that this is only very basic support.  It doesn't yet
>>>> have the code needed to register devices and drivers from device tree
>>>> data.  That will be coming real-soon-now.
>>>>
>>>>         
>>> Is someone going to do a device tree example port to a 'real' platform
>>> rather than simple the ARM evaluation boards?
>>>
>>> As I've said previously, I'm not going to accept device tree stuff until
>>> I see a working implementation on a set of real platforms.
>>>
>>>       
>> I can give it a spin on a couple of the boards I have here.  I'm already
>> using device trees on my PPC platforms.
>>     
>
> Hi Bill.  I've just pushed out my tree with a bit of the device tree
> probing working on the versatile platform.  It works with the QEMU
> branch that Jeremy Kerr is maintaining.  Here are the git trees, and
> the web page that describes how to build it:
>
> git://git.secretlab.ca/git/linux-2.6 test-devicetree
> git://git://kernel.ubuntu.com/jk/dt/qemu.git
> https://wiki.ubuntu.com/KernelTeam/ARMDeviceTrees
>
> I've got stuff working on real hardware too, but it's not fully baked
> yet.  Right now qemu is the least trouble.
>
> g.
>
>   

Grant and Jeremy,

I'm very happy to try that on my real Freescale i.MX51 board. Any hints 
about that?

Cheers,
-Bryan

devicetree in arm

[Grant Likely]

On Thu, Apr 8, 2010 at 12:41 AM, Bryan Wu <bryan.wu@canonical.com> wrote:
> Grant Likely wrote:
>>
>> On Thu, Mar 18, 2010 at 2:24 PM, Bill Gatliff <bgat@billgatliff.com>
>> wrote:
>>
>>>
>>> Russell King - ARM Linux wrote:
>>>
>>>>
>>>> On Thu, Mar 18, 2010 at 07:14:05AM -0600, Grant Likely wrote:
>>>>
>>>>
>>>>>
>>>>> ARM device tree support is very much in flux, and that particular
>>>>> branch gets rebased a lot as device tree code from Sparc, Microblaze
>>>>> and Powerpc is merged into drivers/of. ?I may have ended up pushing
>>>>> out to test-devicetree without the ARM patches applied. ?I'll look at
>>>>> it today, make sure the ARM stuff is all there, and then push it out
>>>>> again.
>>>>>
>>>>> Note however that this is only very basic support. ?It doesn't yet
>>>>> have the code needed to register devices and drivers from device tree
>>>>> data. ?That will be coming real-soon-now.
>>>>>
>>>>>
>>>>
>>>> Is someone going to do a device tree example port to a 'real' platform
>>>> rather than simple the ARM evaluation boards?
>>>>
>>>> As I've said previously, I'm not going to accept device tree stuff until
>>>> I see a working implementation on a set of real platforms.
>>>>
>>>>
>>>
>>> I can give it a spin on a couple of the boards I have here. ?I'm already
>>> using device trees on my PPC platforms.
>>>
>>
>> Hi Bill. ?I've just pushed out my tree with a bit of the device tree
>> probing working on the versatile platform. ?It works with the QEMU
>> branch that Jeremy Kerr is maintaining. ?Here are the git trees, and
>> the web page that describes how to build it:
>>
>> git://git.secretlab.ca/git/linux-2.6 test-devicetree
>> git://git://kernel.ubuntu.com/jk/dt/qemu.git
>> https://wiki.ubuntu.com/KernelTeam/ARMDeviceTrees
>>
>> I've got stuff working on real hardware too, but it's not fully baked
>> yet. ?Right now qemu is the least trouble.
>
> Grant and Jeremy,
>
> I'm very happy to try that on my real Freescale i.MX51 board. Any hints
> about that?

Look at Jeremy's tree.  He's got a bunch of i.MX51 patches based on
top of my tree.  Here's the git url:

git://kernel.ubuntu.com/jk/dt/linux-2.6.git

g.

devicetree in arm

[Jeremy Kerr]

Hi Bryan,

> I'm very happy to try that on my real Freescale i.MX51 board. Any hints
> about that?

Support for imx51 is a work-in-progress. As Grant has said, I have some 
patches (in my mx51 branch), but they're mostly experimental at the moment.

I'm in the middle of reviewing & merging some new patches from Rob Herring, 
which add DT support to imx51 - I'll update the wiki page when we have things 
working on hardware :)

Cheers,


Jeremy