irqchip: Add brcm, bcm6345-l1-intc device tree binding

Add device tree binding for the BCM6345 interrupt controller.

This controller is similar to the SMP-capable BCM7038 and
the BCM3380 but with packed interrupt registers.

Signed-off-by: Simon Arlott <simon@fire.lp0.eu>
Acked-by: Rob Herring <robh@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Pawel Moll <pawel.moll@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Ian Campbell <ijc+devicetree@hellion.org.uk>
Cc: Kumar Gala <galak@codeaurora.org>
Cc: Jonas Gorski <jogo@openwrt.org>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Cc: devicetree@vger.kernel.org
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/11804/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Simon Arlott 2015-12-09 20:27:09 +00:00 committed by Ralf Baechle
parent e2c93cf14b
commit 331ae5fc3e
1 changed files with 57 additions and 0 deletions

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Broadcom BCM6345-style Level 1 interrupt controller
This block is a first level interrupt controller that is typically connected
directly to one of the HW INT lines on each CPU.
Key elements of the hardware design include:
- 32, 64 or 128 incoming level IRQ lines
- Most onchip peripherals are wired directly to an L1 input
- A separate instance of the register set for each CPU, allowing individual
peripheral IRQs to be routed to any CPU
- Contains one or more enable/status word pairs per CPU
- No atomic set/clear operations
- No polarity/level/edge settings
- No FIFO or priority encoder logic; software is expected to read all
2-4 status words to determine which IRQs are pending
Required properties:
- compatible: should be "brcm,bcm<soc>-l1-intc", "brcm,bcm6345-l1-intc"
- reg: specifies the base physical address and size of the registers;
the number of supported IRQs is inferred from the size argument
- interrupt-controller: identifies the node as an interrupt controller
- #interrupt-cells: specifies the number of cells needed to encode an interrupt
source, should be 1.
- interrupt-parent: specifies the phandle to the parent interrupt controller(s)
this one is cascaded from
- interrupts: specifies the interrupt line(s) in the interrupt-parent controller
node; valid values depend on the type of parent interrupt controller
If multiple reg ranges and interrupt-parent entries are present on an SMP
system, the driver will allow IRQ SMP affinity to be set up through the
/proc/irq/ interface. In the simplest possible configuration, only one
reg range and one interrupt-parent is needed.
The driver operates in native CPU endian by default, there is no support for
specifying an alternative endianness.
Example:
periph_intc: interrupt-controller@10000000 {
compatible = "brcm,bcm63168-l1-intc", "brcm,bcm6345-l1-intc";
reg = <0x10000020 0x20>,
<0x10000040 0x20>;
interrupt-controller;
#interrupt-cells = <1>;
interrupt-parent = <&cpu_intc>;
interrupts = <2>, <3>;
};