On Fri, May 31, 2013 at 12:47 PM, Arnd Bergmann [off-list ref] wrote:

On Friday 31 May 2013 11:19:06 Linus Walleij wrote:

quoted

 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