124 lines
3.2 KiB
YAML
124 lines
3.2 KiB
YAML
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# SPDX-License-Identifier: GPL-2.0
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/timer/arm,arch_timer_mmio.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: ARM memory mapped architected timer
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maintainers:
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- Marc Zyngier <marc.zyngier@arm.com>
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- Mark Rutland <mark.rutland@arm.com>
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description: |+
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ARM cores may have a memory mapped architected timer, which provides up to 8
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frames with a physical and optional virtual timer per frame.
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The memory mapped timer is attached to a GIC to deliver its interrupts via SPIs.
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properties:
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compatible:
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items:
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- enum:
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- arm,armv7-timer-mem
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reg:
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maxItems: 1
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description: The control frame base address
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'#address-cells':
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enum: [1, 2]
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'#size-cells':
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const: 1
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ranges: true
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clock-frequency:
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description: The frequency of the main counter, in Hz. Should be present
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only where necessary to work around broken firmware which does not configure
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CNTFRQ on all CPUs to a uniform correct value. Use of this property is
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strongly discouraged; fix your firmware unless absolutely impossible.
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always-on:
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type: boolean
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description: If present, the timer is powered through an always-on power
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domain, therefore it never loses context.
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arm,cpu-registers-not-fw-configured:
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type: boolean
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description: Firmware does not initialize any of the generic timer CPU
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registers, which contain their architecturally-defined reset values. Only
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supported for 32-bit systems which follow the ARMv7 architected reset
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values.
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arm,no-tick-in-suspend:
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type: boolean
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description: The main counter does not tick when the system is in
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low-power system suspend on some SoCs. This behavior does not match the
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Architecture Reference Manual's specification that the system counter "must
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be implemented in an always-on power domain."
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patternProperties:
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'^frame@[0-9a-z]*$':
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type: object
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additionalProperties: false
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description: A timer node has up to 8 frame sub-nodes, each with the following properties.
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properties:
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frame-number:
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$ref: "/schemas/types.yaml#/definitions/uint32"
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minimum: 0
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maximum: 7
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interrupts:
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minItems: 1
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items:
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- description: physical timer irq
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- description: virtual timer irq
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reg:
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minItems: 1
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items:
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- description: 1st view base address
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- description: 2nd optional view base address
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required:
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- frame-number
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- interrupts
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- reg
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required:
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- compatible
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- reg
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- '#address-cells'
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- '#size-cells'
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additionalProperties: false
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examples:
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- |
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timer@f0000000 {
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compatible = "arm,armv7-timer-mem";
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#address-cells = <1>;
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#size-cells = <1>;
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ranges = <0 0xf0001000 0x1000>;
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reg = <0xf0000000 0x1000>;
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clock-frequency = <50000000>;
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frame@0 {
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frame-number = <0>;
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interrupts = <0 13 0x8>,
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<0 14 0x8>;
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reg = <0x0000 0x1000>,
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<0x1000 0x1000>;
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};
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frame@2000 {
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frame-number = <1>;
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interrupts = <0 15 0x8>;
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reg = <0x2000 0x1000>;
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};
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};
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...
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