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# 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>;
};