0001 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
0002 %YAML 1.2
0003 ---
0004 $id: http://devicetree.org/schemas/timer/arm,twd-timer.yaml#
0005 $schema: http://devicetree.org/meta-schemas/core.yaml#
0006
0007 title: ARM Timer-Watchdog Timer
0008
0009 maintainers:
0010 - Rob Herring <robh@kernel.org>
0011
0012 description:
0013 ARM 11MP, Cortex-A5 and Cortex-A9 are often associated with a per-core
0014 Timer-Watchdog (aka TWD), which provides both a per-cpu local timer
0015 and watchdog.
0016
0017 The TWD is usually attached to a GIC to deliver its two per-processor
0018 interrupts.
0019
0020 properties:
0021 compatible:
0022 enum:
0023 - arm,cortex-a9-twd-timer
0024 - arm,cortex-a5-twd-timer
0025 - arm,arm11mp-twd-timer
0026
0027 reg:
0028 maxItems: 1
0029
0030 interrupts:
0031 maxItems: 1
0032
0033 clocks:
0034 maxItems: 1
0035
0036 always-on:
0037 description:
0038 If present, the timer is powered through an always-on power domain,
0039 therefore it never loses context.
0040
0041 required:
0042 - compatible
0043 - reg
0044 - interrupts
0045
0046 additionalProperties: false
0047
0048 examples:
0049 - |
0050 #include <dt-bindings/interrupt-controller/arm-gic.h>
0051
0052 timer@2c000600 {
0053 compatible = "arm,arm11mp-twd-timer";
0054 reg = <0x2c000600 0x20>;
0055 interrupts = <GIC_PPI 13 0xf01>;
0056 };
