[PATCH 31/39] ARM: u300: add syscon node

[Linus Walleij]

On Fri, May 31, 2013 at 12:47 PM, Arnd Bergmann <arnd at arndb.de> wrote:
> On Friday 31 May 2013 11:19:06 Linus Walleij wrote:

>>  compatible="stericsson,u300";
>>
>> +Required node: syscon
>> +This contains the system controller.
>> +- compatible: must be "stericsson,u300-syscon".
>> +- reg: the base address and size of the system controller.
>> +
>
> Any reason why you are not making it compatible with "syscon", to use
> the drivers/mfd/syscon.c driver?

For the first lookup at irq_init() we cannot use it.

This is because that needs to be initialized at irq_init() time
to set up the clocks, which are needed by the interrupt controller,
it cannot use device matching, as the platform devices are not
probed yet.

However I can make it compatible for the board power snippet
to make use of it for sure.

But I find no good examples in the kernel on how to grab a
referenced syscon node and use the regmap API to read/write
registers :-(

Dong: do you have some example to point at for this?

Yours,
Linus Walleij