[PATCH 01/10] dt/bindings: add passthru-mask property to versatile-fpga-irq

[Linus Walleij]

On Tue, May 20, 2014 at 11:09 PM, Rob Herring <robherring2 at gmail.com> wrote:

> From: Rob Herring <robh at kernel.org>
>
> Add a passthru-mask property for setting interrupts which are passed
> through directly to a primary controller.
>
> Signed-off-by: Rob Herring <robh at kernel.org>
> Cc: Pawel Moll <pawel.moll at arm.com>
> Cc: Mark Rutland <mark.rutland at arm.com>
> Cc: Ian Campbell <ijc+devicetree at hellion.org.uk>
> Cc: Kumar Gala <galak at codeaurora.org>
> ---
>  Documentation/devicetree/bindings/arm/versatile-fpga-irq.txt | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/arm/versatile-fpga-irq.txt b/Documentation/devicetree/bindings/arm/versatile-fpga-irq.txt
> index c9cf605..956b71d 100644
> --- a/Documentation/devicetree/bindings/arm/versatile-fpga-irq.txt
> +++ b/Documentation/devicetree/bindings/arm/versatile-fpga-irq.txt
> @@ -34,3 +34,6 @@ Optional properties:
>  - interrupts: if the FPGA IRQ controller is cascaded, i.e. if its IRQ
>    output is simply connected to the input of another IRQ controller,
>    then the parent IRQ shall be specified in this property.
> +- passthru-mask: a u32 number representing a bit mas determining which of

bit mask

(speling)

> +  the interrupts are directly passed through to the primary interrupt
> +  controller.

This is very confusing on the Integrators. The FPGA IRQ controller
*is* the primary interrupt controller on these.

(Further on Integrators with an IM-PD1 expansion board the
VIC is actually the secondary controller visavis the FPGA
IRQ controller which is the primary one.)

So on the versatile the FPGA IRQ controller is *not* cascaded
off one line of the VIC but rather connected in parallel or
something?

Care to elaborate a bit on how things are cascaded here?
And specify that this is for some special usecase or
something?

I'll read through the patches and see if I can wrap my head
around this.

Yours,
Linus Walleij