[PATCH v2 2/4] irqchip: bcm2835: If a parent interrupt is registered, chain from it.

Eric Anholt eric at anholt.net
Wed Jul 22 11:17:20 PDT 2015

Stephen Warren <swarren at wwwdotorg.org> writes:

> On 07/13/2015 07:35 PM, Eric Anholt wrote:
>> The BCM2836 (Raspberry Pi 2) uses two levels of interrupt handling
>> with the CPU-local interrupts being the root, so we need to register
>> ours as chained off of the CPU's local interrupt.
> Sorry for the slow review; laziness after vacation!
>> diff --git a/Documentation/devicetree/bindings/interrupt-controller/brcm,bcm2835-armctrl-ic.txt b/Documentation/devicetree/bindings/interrupt-controller/brcm,bcm2835-armctrl-ic.txt
>> +The BCM2836 contains the same interrupt controller with the same
>> +interrupts, but the per-CPU interrupt controller is the root, and an
>> +interrupt there indicates that the ARMCTRL has an interrupt to handle.
>> +
>>  Required properties:
>>  - compatible : should be "brcm,bcm2835-armctrl-ic"
> Since there are some differences between the bcm2835 and bcm2836 HW
> blocks, I'd expect the compatible value to be different for each. In
> particular...

Well, there are actually no differences within this block of the HW (HDL
is unmodified), it's just where the output interrupt line gets consumed.
But it's not much extra to add a new compatible value, so sure.
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