[RFC PATCH 1/1] of/irq: create interrupts-extended-2 property

[Olof Johansson]

On Mon, Jan 20, 2014 at 2:47 PM, Grant Likely <grant.likely at linaro.org> wrote:
> On Wed, 15 Jan 2014 16:12:24 +0000, Mark Rutland <mark.rutland at arm.com> wrote:
>> >
>> > Another, more invasive option would be extend the dts syntax and teach
>> > dtc to handle property appending. Then the soc dts could stay as it is,
>> > and the board dts could have something like:
>> >
>> >     /append-property/ interrupts = <&intc1 6 1>;
>> >     /append-property/ interrupt-names = "board-specific-irq";
>> >
>> > Both these options solve the issue at the source, are general to other
>> > properties, and allow more than one level of hierarchy (the proposed
>> > interrupts-extended-2 only allows one level).
>>
>> I've just had a go at implementing the append-property mechanism above
>> in dtc, and it was far easier than I expected (patch below).
>>
>> Does anyone have any issues with the /append-property/ idea?
>
> I think that is reasonable.


The main problem with this (same for clocks) is if you need to append
something with a name when the original didn't have any.

Reordering entries might not work for interrupts, since the bindings
might have requirements on order.

I'm not aware of a good solution for this. Suggestions welcome.


-Olof