On Thu, Jul 21, 2016 at 02:09:18PM -0500, Rob Herring wrote:
> On Thu, Jul 21, 2016 at 9:14 AM, Pantelis Antoniou
> <pantelis.antoniou@xxxxxxxxxxxx> wrote:
> > Hi David,
> >
> >> On Jul 21, 2016, at 16:42 , David Gibson <david@xxxxxxxxxxxxxxxxxxxxx> wrote:
> >>
> >> On Wed, Jul 20, 2016 at 11:59:44PM +0300, Pantelis Antoniou wrote:
> >>> Hi David,
> >>>
> >>> Spent some time looking at this, and it looks like it’s going to the right direction.
> >>>
> >>> Comments inline.
> >>>
> >>>> On Jul 18, 2016, at 17:20 , David Gibson <david@xxxxxxxxxxxxxxxxxxxxx> wrote:
> >>>>
> >>>> Hi,
> >>>>
> >>>> Here's some of my thoughts on how a connector format for the DT could
> >>>> be done. Sorry it's taken longer than I hoped - I've been pretty
> >>>> swamped in my day job.
> >>>>
> >>>> This is pretty early thoughts, but gives an outline of the approach I
> >>>> prefer.
>
> [...]
>
> >>>> i2c: i2c@... {
> >>>> };
> >>>> intc: intc@... {
> >>>> #interrupt-cells = <2>;
> >>>> };
> >>>> };
> >>>>
> >>>> connectors {
> >>>> widget1 {
> >>>> compatible = "foo,widget-socket";
> >>>> w1_irqs: irqs {
> >>>> interrupt-controller;
> >>>> #address-cells = <0>;
> >>>> #interrupt-cells = <1>;
> >>>> interrupt-map-mask = <0xffffffff>;
> >>>> interrupt-map = <
> >>>> 0 &intc 7 0
> >>>> 1 &intc 8 0
> >>>> >;
> >>>> };
> >>>
> >>> This is fine. We need an interrupt controller node.
> >>
> >> Actually I think we only need an interrupt nexus, not an interrupt
> >> controller (in IEEE1275 terminology). (An interrupt controller would
> >> generally require it's own driver, to ack/mask irqs, whereas this just
> >> demonstrates the routing to an existing interrupt controller). Which
> >> makes that example slightly incorrect (it shouldn't have the
> >> interrupt-controller property).
> >
> > Hmm, as far as I can tell we only have a concept of an interrupt controller
> > in the kernel. An interrupt nexus is something new. We should get by without
> > a driver but hacking the interrupt lookup path at DT.
>
> Interrupt nexus is the interrupt-map property which is fully
> supported. I'd expect we'll end up with a gpio nexus (i.e. gpio-map)
> for connector gpios, too.
Exactly. I don't know if a gpio-map is already defined, but if it's
not it should be.
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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