linux/Documentation/devicetree/bindings/timer/nvidia,tegra-timer.yaml

# SPDX-License-Identifier: GPL-2.0-only
%YAML 1.2
---
$id: http://devicetree.org/schemas/timer/nvidia,tegra-timer.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: NVIDIA Tegra timer

maintainers:
  - Stephen Warren <swarren@nvidia.com>

allOf:
  - if:
      properties:
        compatible:
          contains:
            const: nvidia,tegra210-timer
    then:
      properties:
        interrupts:
          # Either a single combined interrupt or up to 14 individual interrupts
          minItems: 1
          maxItems: 14
          description: >
            A list of 14 interrupts; one per each timer channels 0 through 13            

  - if:
      properties:
        compatible:
          oneOf:
            - items:
                - enum:
                    - nvidia,tegra114-timer
                    - nvidia,tegra124-timer
                    - nvidia,tegra132-timer
                - const: nvidia,tegra30-timer
            - items:
                - const: nvidia,tegra30-timer
                - const: nvidia,tegra20-timer
    then:
      properties:
        interrupts:
          # Either a single combined interrupt or up to 6 individual interrupts
          minItems: 1
          maxItems: 6
          description: >
            A list of 6 interrupts; one per each of timer channels 1 through 5,
            and one for the shared interrupt for the remaining channels.            

  - if:
      properties:
        compatible:
          const: nvidia,tegra20-timer
    then:
      properties:
        interrupts:
          # Either a single combined interrupt or up to 4 individual interrupts
          minItems: 1
          maxItems: 4
          description: |
            A list of 4 interrupts; one per timer channel.            

properties:
  compatible:
    oneOf:
      - const: nvidia,tegra210-timer
        description: >
          The Tegra210 timer provides fourteen 29-bit timer counters and one 32-bit
          timestamp counter. The TMRs run at either a fixed 1 MHz clock rate derived
          from the oscillator clock (TMR0-TMR9) or directly at the oscillator clock
          (TMR10-TMR13). Each TMR can be programmed to generate one-shot, periodic,
          or watchdog interrupts.          
      - items:
          - enum:
              - nvidia,tegra114-timer
              - nvidia,tegra124-timer
              - nvidia,tegra132-timer
          - const: nvidia,tegra30-timer
      - items:
          - const: nvidia,tegra30-timer
          - const: nvidia,tegra20-timer
        description: >
          The Tegra30 timer provides ten 29-bit timer channels, a single 32-bit free
          running counter, and 5 watchdog modules. The first two channels may also
          trigger a legacy watchdog reset.          
      - const: nvidia,tegra20-timer
        description: >
          The Tegra20 timer provides four 29-bit timer channels and a single 32-bit free
          running counter. The first two channels may also trigger a watchdog reset.          

  reg:
    maxItems: 1

  interrupts: true

  clocks:
    maxItems: 1

  clock-names:
    items:
      - const: timer


required:
  - compatible
  - reg
  - interrupts
  - clocks

additionalProperties: false

examples:
  - |
    #include <dt-bindings/interrupt-controller/irq.h>
    timer@60005000 {
        compatible = "nvidia,tegra30-timer", "nvidia,tegra20-timer";
        reg = <0x60005000 0x400>;
        interrupts = <0 0 IRQ_TYPE_LEVEL_HIGH>,
                     <0 1 IRQ_TYPE_LEVEL_HIGH>,
                     <0 41 IRQ_TYPE_LEVEL_HIGH>,
                     <0 42 IRQ_TYPE_LEVEL_HIGH>,
                     <0 121 IRQ_TYPE_LEVEL_HIGH>,
                     <0 122 IRQ_TYPE_LEVEL_HIGH>;
        clocks = <&tegra_car 214>;
    };    
  - |
    #include <dt-bindings/clock/tegra210-car.h>
    #include <dt-bindings/interrupt-controller/arm-gic.h>
    #include <dt-bindings/interrupt-controller/irq.h>

    timer@60005000 {
        compatible = "nvidia,tegra210-timer";
        reg = <0x60005000 0x400>;
        interrupts = <GIC_SPI 156 IRQ_TYPE_LEVEL_HIGH>,
                     <GIC_SPI 0 IRQ_TYPE_LEVEL_HIGH>,
                     <GIC_SPI 1 IRQ_TYPE_LEVEL_HIGH>,
                     <GIC_SPI 41 IRQ_TYPE_LEVEL_HIGH>,
                     <GIC_SPI 42 IRQ_TYPE_LEVEL_HIGH>,
                     <GIC_SPI 121 IRQ_TYPE_LEVEL_HIGH>,
                     <GIC_SPI 152 IRQ_TYPE_LEVEL_HIGH>,
                     <GIC_SPI 153 IRQ_TYPE_LEVEL_HIGH>,
                     <GIC_SPI 154 IRQ_TYPE_LEVEL_HIGH>,
                     <GIC_SPI 155 IRQ_TYPE_LEVEL_HIGH>,
                     <GIC_SPI 176 IRQ_TYPE_LEVEL_HIGH>,
                     <GIC_SPI 177 IRQ_TYPE_LEVEL_HIGH>,
                     <GIC_SPI 178 IRQ_TYPE_LEVEL_HIGH>,
                     <GIC_SPI 179 IRQ_TYPE_LEVEL_HIGH>;
        clocks = <&tegra_car TEGRA210_CLK_TIMER>;
        clock-names = "timer";
    };