Commit cab303be91dc47942bc25de33dc1140123540800 [1] introduced a WARN_ON test which triggers a WARNING backtrace on at91 platforms. While this WARN_ON is absolutely necessary to warn users that they should not mix request with and without IRQF_NO_SUSPEND flags on shared IRQs, there is no easy way to solve this issue on at91 platforms. The main reason is that the init timer is often using a shared irq line and thus request this irq with IRQF_NO_SUSPEND flag set, while other peripherals request the same irq line without this flag. As suggested by Thomas, the first 2 patches of this series add a dumb demultiplexer irqchip implementation. This demuxer takes register to a source interrupt and then forwards all received interrupts to its children (it they are enabled). Patches 3 to 5 are here for testing purpose, and should be generalized to all impacted SoCs if the approach is accepted. Best Regards, Boris Boris Brezillon (5): irqchip: add dumb demultiplexer implementation irqchip: Add DT binding doc for dumb demuxer chips ARM: at91/dt: select DUMB_IRQ_DEMUX for all at91 SoCs ARM: at91/dt: add AIC irq1 muxed peripheral id definitions ARM: at91/dt: define a dumb irq demultiplexer chip connected on irq1 .../bindings/interrupt-controller/dumb-demux.txt | 34 +++++ arch/arm/boot/dts/at91sam9260.dtsi | 26 +++- arch/arm/mach-at91/Kconfig | 2 + drivers/irqchip/Kconfig | 4 + drivers/irqchip/Makefile | 1 + drivers/irqchip/irq-dumb-demux.c | 70 +++++++++++ .../dt-bindings/interrupt-controller/atmel-aic.h | 22 ++++ include/linux/irq.h | 49 ++++++++ include/linux/irqdomain.h | 1 + kernel/irq/Kconfig | 5 + kernel/irq/Makefile | 1 + kernel/irq/chip.c | 41 ++++++ kernel/irq/dumb-demux-chip.c | 140 +++++++++++++++++++++ kernel/irq/handle.c | 31 ++++- kernel/irq/internals.h | 3 + 15 files changed, 422 insertions(+), 8 deletions(-) create mode 100644 Documentation/devicetree/bindings/interrupt-controller/dumb-demux.txt create mode 100644 drivers/irqchip/irq-dumb-demux.c create mode 100644 include/dt-bindings/interrupt-controller/atmel-aic.h create mode 100644 kernel/irq/dumb-demux-chip.c -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
