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SubjectRe: [RFC PATCH 0/6] DRIVERS: IRQCHIP: Add support for crossbar IP
On 09/30/2013 08:59 AM, Sricharan R wrote:
> Some socs have a large number of interrupts requests to service
> the needs of its many peripherals and subsystems. All of the interrupt
> requests lines from the subsystems are not needed at the same
> time, so they have to be muxed to the controllers appropriately.
> In such places a interrupt controllers are preceded by an
> IRQ CROSSBAR that provides flexibility in muxing the device interrupt
> requests to the controller inputs.
>
> This series models the peripheral interrupts that can be routed through
> the crossbar to the GIC as 'routable-irqs'. The routable irqs are added
> in a separate linear domain inside the GIC. The registered routable domain's
> callback are invoked as a part of the GIC's callback, which in turn should
> allocate a free irq line and configure the IP accordingly. So every peripheral
> in the dts files mentions the fixed crossbar number as its interrupt. A free
> gic line for that gets allocated and configured when the peripheral's interrupt
> is mapped.
>
> The minimal crossbar driver to track and allocate free GIC lines and configure the
> crossbar is added here, along with the DT bindings.

Seems like interrupt-map property is what you need here.

http://devicetree.org/Device_Tree_Usage#Advanced_Interrupt_Mapping

Versatile Express also has an example.

Rob

>
> Sricharan R (6):
> DRIVERS: IRQCHIP: IRQ-GIC: Add support for routable irqs
> DRIVERS: IRQCHIP: CROSSBAR: Add support for Crossbar IP
> ARM: DTS: DRA: Add crossbar device binding
> ARM: DTS: DRA: Replace peripheral interrupt numbers with crossbar
> inputs.
> ARM: OMAP4+: Correct Wakeup-gen code to use physical irq number
> ARM: DRA: Enable Crossbar IP support for DRA7XX
>
> Documentation/devicetree/bindings/arm/gic.txt | 5 +
> .../devicetree/bindings/arm/omap/crossbar.txt | 27 +++
> arch/arm/boot/dts/dra7.dtsi | 98 +++++-----
> arch/arm/mach-omap2/Kconfig | 1 +
> arch/arm/mach-omap2/omap-wakeupgen.c | 4 +-
> arch/arm/mach-omap2/omap4-common.c | 4 +
> drivers/irqchip/Kconfig | 8 +
> drivers/irqchip/Makefile | 1 +
> drivers/irqchip/irq-crossbar.c | 195 ++++++++++++++++++++
> drivers/irqchip/irq-gic.c | 57 +++++-
> include/linux/irqchip/arm-gic.h | 8 +-
> include/linux/irqchip/irq-crossbar.h | 11 ++
> 12 files changed, 363 insertions(+), 56 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/arm/omap/crossbar.txt
> create mode 100644 drivers/irqchip/irq-crossbar.c
> create mode 100644 include/linux/irqchip/irq-crossbar.h
>



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