kernel/Documentation/devicetree/bindings/timer/samsung,exynos4210-mct.yaml

# SPDX-License-Identifier: GPL-2.0
%YAML 1.2
---
$id: http://devicetree.org/schemas/timer/samsung,exynos4210-mct.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Samsung Exynos SoC Multi Core Timer (MCT)

maintainers:
  - Krzysztof Kozlowski <krzk@kernel.org>

description: |+
  The Samsung's Multi Core Timer (MCT) module includes two main blocks, the
  global timer and CPU local timers. The global timer is a 64-bit free running
  up-counter and can generate 4 interrupts when the counter reaches one of the
  four preset counter values. The CPU local timers are 32-bit free running
  down-counters and generate an interrupt when the counter expires. There is
  one CPU local timer instantiated in MCT for every CPU in the system.

properties:
  compatible:
    enum:
      - samsung,exynos4210-mct
      - samsung,exynos4412-mct

  clocks:
    minItems: 2
    maxItems: 2

  clock-names:
    items:
      - pattern: "^(fin_pll|mct)$"
      - pattern: "^(fin_pll|mct)$"

  reg:
    maxItems: 1

  interrupts:
    description: |
      Interrupts should be put in specific order. This is, the local timer
      interrupts should be specified after the four global timer interrupts
      have been specified:
      0: Global Timer Interrupt 0
      1: Global Timer Interrupt 1
      2: Global Timer Interrupt 2
      3: Global Timer Interrupt 3
      4: Local Timer Interrupt 0
      5: Local Timer Interrupt 1
      6: ..
      7: ..
      i: Local Timer Interrupt n
      For MCT block that uses a per-processor interrupt for local timers, such
      as ones compatible with "samsung,exynos4412-mct", only one local timer
      interrupt might be specified, meaning that all local timers use the same
      per processor interrupt.
    minItems: 5               # 4 Global + 1 local
    maxItems: 20              # 4 Global + 16 local

required:
  - compatible
  - clock-names
  - clocks
  - interrupts
  - reg

additionalProperties: false

examples:
  - |
    // In this example, the IP contains two local timers, using separate
    // interrupts, so two local timer interrupts have been specified,
    // in addition to four global timer interrupts.
    #include <dt-bindings/clock/exynos4.h>
    #include <dt-bindings/interrupt-controller/arm-gic.h>

    timer@10050000 {
        compatible = "samsung,exynos4210-mct";
        reg = <0x10050000 0x800>;
        clocks = <&clock CLK_FIN_PLL>, <&clock CLK_MCT>;
        clock-names = "fin_pll", "mct";

        interrupts = <GIC_SPI 57 IRQ_TYPE_LEVEL_HIGH>,
                     <GIC_SPI 69 IRQ_TYPE_LEVEL_HIGH>,
                     <GIC_SPI 70 IRQ_TYPE_LEVEL_HIGH>,
                     <GIC_SPI 71 IRQ_TYPE_LEVEL_HIGH>,
                     <GIC_SPI 42 IRQ_TYPE_LEVEL_HIGH>,
                     <GIC_SPI 48 IRQ_TYPE_LEVEL_HIGH>;
    };

  - |
    // In this example, the timer interrupts are connected to two separate
    // interrupt controllers. Hence, an interrupts-extended is needed.
    #include <dt-bindings/clock/exynos4.h>
    #include <dt-bindings/interrupt-controller/arm-gic.h>

    timer@101c0000 {
        compatible = "samsung,exynos4210-mct";
        reg = <0x101C0000 0x800>;
        clocks = <&clock CLK_FIN_PLL>, <&clock CLK_MCT>;
        clock-names = "fin_pll", "mct";

        interrupts-extended = <&gic GIC_SPI 57 IRQ_TYPE_LEVEL_HIGH>,
                              <&gic GIC_SPI 69 IRQ_TYPE_LEVEL_HIGH>,
                              <&combiner 12 6>,
                              <&combiner 12 7>,
                              <&gic GIC_SPI 42 IRQ_TYPE_LEVEL_HIGH>,
                              <&gic GIC_SPI 48 IRQ_TYPE_LEVEL_HIGH>;
    };

  - |
    // In this example, the IP contains four local timers, but using
    // a per-processor interrupt to handle them. Only one first local
    // interrupt is specified.
    #include <dt-bindings/clock/exynos4.h>
    #include <dt-bindings/interrupt-controller/arm-gic.h>

    timer@10050000 {
        compatible = "samsung,exynos4412-mct";
        reg = <0x10050000 0x800>;
        clocks = <&clock CLK_FIN_PLL>, <&clock CLK_MCT>;
        clock-names = "fin_pll", "mct";

        interrupts = <GIC_SPI 57 IRQ_TYPE_LEVEL_HIGH>,
                     <GIC_SPI 69 IRQ_TYPE_LEVEL_HIGH>,
                     <GIC_SPI 70 IRQ_TYPE_LEVEL_HIGH>,
                     <GIC_SPI 71 IRQ_TYPE_LEVEL_HIGH>,
                     <GIC_PPI 42 IRQ_TYPE_LEVEL_HIGH>;
    };

  - |
    // In this example, the IP contains four local timers, but using
    // a per-processor interrupt to handle them. All the local timer
    // interrupts are specified.
    #include <dt-bindings/clock/exynos4.h>
    #include <dt-bindings/interrupt-controller/arm-gic.h>

    timer@10050000 {
        compatible = "samsung,exynos4412-mct";
        reg = <0x10050000 0x800>;
        clocks = <&clock CLK_FIN_PLL>, <&clock CLK_MCT>;
        clock-names = "fin_pll", "mct";

        interrupts = <GIC_SPI 57 IRQ_TYPE_LEVEL_HIGH>,
                     <GIC_SPI 69 IRQ_TYPE_LEVEL_HIGH>,
                     <GIC_SPI 70 IRQ_TYPE_LEVEL_HIGH>,
                     <GIC_SPI 71 IRQ_TYPE_LEVEL_HIGH>,
                     <GIC_PPI 42 IRQ_TYPE_LEVEL_HIGH>,
                     <GIC_PPI 42 IRQ_TYPE_LEVEL_HIGH>,
                     <GIC_PPI 42 IRQ_TYPE_LEVEL_HIGH>,
                     <GIC_PPI 42 IRQ_TYPE_LEVEL_HIGH>;
    };