Re: [RFC 2/5] ARM: dts: Add Cross Trigger Interface binding

[Will Deacon <will.deacon@arm.com>]

On Wed, Dec 12, 2012 at 09:43:05PM +0000, Jon Hunter wrote:
> Adds a device-tree binding for the ARM Cross Trigger Interface (CTI).
> The ARM Cross Trigger Interface provides a way to route events between
> processor modules. For example, on OMAP4430 we use the CTI module to
> route PMU events to the GIC interrupt module.
> 
> Signed-off-by: Jon Hunter <jon-hunter@ti.com>
> ---
>  Documentation/devicetree/bindings/arm/cti.txt |   32 +++++++++++++++++++++++++
>  1 file changed, 32 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/arm/cti.txt
> 
> diff --git a/Documentation/devicetree/bindings/arm/cti.txt b/Documentation/devicetree/bindings/arm/cti.txt
> new file mode 100644
> index 0000000..4a0e2d3
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/cti.txt
> @@ -0,0 +1,32 @@
> +* ARM Cross Trigger Interface (CTI)
> +
> +The ARM Cross Trigger Interface provides a way to route events between
> +processor modules. For example, debug events from one processor can be
> +broadcasted to other processors. The events that can be routed between
> +processors are specific to the device.
> +
> +Required properties:
> +
> +- compatible:			Should be "arm,primecell".
> +- interrupts:			Interrupt associated with CTI module.
> +- reg:				Contains timer register address range (base
> +				address and length).
> +- arm,cti-name:			A unique name for the CTI module, that will be
> +				used when requesting the CTI module instance.
> +
> +
> +Optional properties:
> +
> +- arm-primecell-periphid:	Primecell peripheral ID associated with CTI
> +				module.

For multi-cluster systems, I wouldn't be surprised to see multiple CTI
instances, each with different CPU affinities. Can we include an affinity
property following Mark's proposed binding?

  http://lists.infradead.org/pipermail/linux-arm-kernel/2012-December/137290.html

Will