soc: ixp4xx: qmgr: Add DT bindings for IXP4xx qmgr

# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)

# Copyright 2019 Linaro Ltd.

%YAML 1.2

---

$id: "http://devicetree.org/schemas/misc/intel-ixp4xx-ahb-queue-manager.yaml#"

$schema: "http://devicetree.org/meta-schemas/core.yaml#"

title: Intel IXP4xx AHB Queue Manager

maintainers:

  - Linus Walleij <linus.walleij@linaro.org>

description: |

  The IXP4xx AHB Queue Manager maintains queues as circular buffers in

  an 8KB embedded SRAM along with hardware pointers. It is used by both

  the XScale processor and the NPEs (Network Processing Units) in the

  IXP4xx for accelerating queues, especially for networking. Clients pick

  queues from the queue manager with foo-queue = <&qmgr N> where the

  &qmgr is a phandle to the queue manager and N is the queue resource

  number. The queue resources available and their specific purpose

  on a certain IXP4xx system will vary.

properties:

  compatible:

    items:

      - const: intel,ixp4xx-ahb-queue-manager

  reg:

    maxItems: 1

  interrupts:

    items:

      - description: Interrupt for queues 0-31

      - description: Interrupt for queues 32-63

required:

  - compatible

  - reg

  - interrupts

examples:

  - |

    #include <dt-bindings/interrupt-controller/irq.h>

    qmgr: queue-manager@60000000 {

         compatible = "intel,ixp4xx-ahb-queue-manager";

         reg = <0x60000000 0x4000>;

         interrupts = <3 IRQ_TYPE_LEVEL_HIGH>, <4 IRQ_TYPE_LEVEL_HIGH>;

    };