xref: /kernel/linux/linux-6.6/Documentation/devicetree/bindings/interrupt-controller/brcm,bcm7038-l1-intc.yaml

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/interrupt-controller/brcm,bcm7038-l1-intc.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Broadcom BCM7038-style Level 1 interrupt controller

description: >
  This block is a first level interrupt controller that is typically connected
  directly to one of the HW INT lines on each CPU.  Every BCM7xxx set-top chip
  since BCM7038 has contained this hardware.

  Key elements of the hardware design include:

   - 64, 96, 128, or 160 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

   - Atomic mask/unmask operations

   - No polarity/level/edge settings

   - No FIFO or priority encoder logic; software is expected to read all
     2-5 status words to determine which IRQs are pending

   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.

maintainers:
  - Florian Fainelli <f.fainelli@gmail.com>

allOf:
  - $ref: /schemas/interrupt-controller.yaml#

properties:
  compatible:
    const: brcm,bcm7038-l1-intc

  reg:
    description: >
      Specifies the base physical address and size of the registers
      the number of supported IRQs is inferred from the size argument

  interrupt-controller: true

  "#interrupt-cells":
    const: 1

  interrupts:
    description: >
     Specifies the interrupt line(s) in the interrupt-parent controller node;
     valid values depend on the type of parent interrupt controller

  brcm,irq-can-wake:
    type: boolean
    description: >
      If present, this means the L1 controller can be used as a
      wakeup source for system suspend/resume.

  brcm,int-fwd-mask:
    $ref: /schemas/types.yaml#/definitions/uint32-array
    description:
      If present, a bit mask to indicate which interrupts have already been
      configured by the firmware and should be left unmanaged. This should
      have one 32-bit word per status/set/clear/mask group.

required:
  - compatible
  - reg
  - interrupt-controller
  - "#interrupt-cells"
  - interrupts

additionalProperties: false

examples:
  - |
    periph_intc: interrupt-controller@1041a400 {
      compatible = "brcm,bcm7038-l1-intc";
      reg = <0x1041a400 0x30>, <0x1041a600 0x30>;
      interrupt-controller;
      #interrupt-cells = <1>;
      interrupt-parent = <&cpu_intc>;
      interrupts = <2>, <3>;
    };