Regarding irq_of_parse_and_map

[Vijay Nikam]

> Because dtc will generate phandles automatically when you reference the
> node with the & operator.

Yes the same statement I found in dts-bindings for gpio txt, sorry I
missed it somehow ...

> Do you want your changes to ever make it into the upstream kernel?

Yes I would like to do that ... but the reason I asked is as it is my
first try so I am thinking that I will edit the same file and do it in
the same way ofcourse I will follow for device node gpio-controller
the new apporach and later if it works then I will create new dts with
upstream Linux base ...

Now I have created the mpc8313erdb.dts with gpio-controller device
node. I would like to ask that now I should compile it with dtc and
generate dtb and I should load this dtb on board/target, Right ? ? ?
please correct me if I am wrong ...

Also is it possible to compile device tree on Linux host and genreate
dtb for powerpc ? ? ? If yes, then how ? ? ? please let me know ...
thanks ...

Before I tried to generate virtual irq using irq_create_mapping and I
got the same number as hw_irq_no i.e. 74 as virtual irq. Also the
entry was made in proc/interrupts and trigger was 8 (Level). But when
I tried to interrupt and the handler was never called ? ? ? Was it
because of gpio device node missing in device tree ? ? ? please let me
know ... thanks ...

Kindly please acknowledge ... thank you ...

Kind Regards,
Vijay Nikam


On 2/18/09, Scott Wood <scottwood at freescale.com> wrote:
> On Wed, Feb 18, 2009 at 05:31:34PM +0530, Vijay Nikam wrote:
> > > Don't specify this explicitly.  Please base new development off of the
> > > device tree that is in upstream Linux, not the very old tree in your BSP.
> >
> > May I know the reason why I should not specify it explicitly ? ? ?
>
> Because dtc will generate phandles automatically when you reference the
> node with the & operator.
>
> > Also what would be the problem if I do in the same way as it is given
> > in BSP mpc8313erdb.dts ? ? ?
>
> Do you want your changes to ever make it into the upstream kernel?
>
> > And should I use gpio-controller as a gpio device node ? ? ?
>
> Yes, the node should label itself as a gpio controller.
>
> -Scott
>