xref: /openbmc/linux/Documentation/devicetree/bindings/soc/microchip/atmel,at91rm9200-tcb.yaml (revision cd6720ba)

# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: "http://devicetree.org/schemas/soc/microchip/atmel,at91rm9200-tcb.yaml#"
$schema: "http://devicetree.org/meta-schemas/core.yaml#"

title: Atmel Timer Counter Block

maintainers:
  - Alexandre Belloni <alexandre.belloni@bootlin.com>

description: |
  The Atmel (now Microchip) SoCs have timers named Timer Counter Block. Each
  timer has three channels with two counters each.

properties:
  compatible:
    items:
      - enum:
          - atmel,at91rm9200-tcb
          - atmel,at91sam9x5-tcb
          - atmel,sama5d2-tcb
      - const: simple-mfd
      - const: syscon

  reg:
    maxItems: 1

  interrupts:
    description:
      List of interrupts. One interrupt per TCB channel if available or one
      interrupt for the TC block
    minItems: 1
    maxItems: 3

  clock-names:
    description:
      List of clock names. Always includes t0_clk and slow clk. Also includes
      t1_clk and t2_clk if a clock per channel is available.
    minItems: 2
    maxItems: 4

  clocks:
    minItems: 2
    maxItems: 4

  '#address-cells':
    const: 1

  '#size-cells':
    const: 0

patternProperties:
  "^timer@[0-2]$":
    description: The timer block channels that are used as timers or counters.
    type: object
    properties:
      compatible:
        items:
          - enum:
              - atmel,tcb-timer
              - atmel,tcb-pwm
              - microchip,tcb-capture
      reg:
        description:
          List of channels to use for this particular timer. In Microchip TCB capture
          mode channels are registered as a counter devices, for the qdec mode TCB0's
          channel <0> and <1> are required.

        minItems: 1
        maxItems: 3
    required:
      - compatible
      - reg

  "^pwm@[0-2]$":
    description: The timer block channels that are used as PWMs.
    $ref: ../../pwm/pwm.yaml#
    type: object
    properties:
      compatible:
        const: atmel,tcb-pwm
      reg:
        description:
          TCB channel to use for this PWM.
        enum: [ 0, 1, 2 ]

      "#pwm-cells":
        description:
          The only third cell flag supported by this binding is
          PWM_POLARITY_INVERTED.
        const: 3

    required:
      - compatible
      - reg
      - "#pwm-cells"

    additionalProperties: false


allOf:
  - if:
      properties:
        compatible:
          contains:
            const: atmel,sama5d2-tcb
    then:
      properties:
        clocks:
          minItems: 3
          maxItems: 3
        clock-names:
          items:
            - const: t0_clk
            - const: gclk
            - const: slow_clk
    else:
      properties:
        clocks:
          minItems: 2
          maxItems: 4
        clock-names:
          oneOf:
            - items:
                - const: t0_clk
                - const: slow_clk
            - items:
                - const: t0_clk
                - const: t1_clk
                - const: t2_clk
                - const: slow_clk

required:
  - compatible
  - reg
  - interrupts
  - clocks
  - clock-names
  - '#address-cells'
  - '#size-cells'

additionalProperties: false

examples:
  - |
    /* One interrupt per TC block: */
        tcb0: timer@fff7c000 {
                compatible = "atmel,at91rm9200-tcb", "simple-mfd", "syscon";
                #address-cells = <1>;
                #size-cells = <0>;
                reg = <0xfff7c000 0x100>;
                interrupts = <18 4>;
                clocks = <&tcb0_clk>, <&clk32k>;
                clock-names = "t0_clk", "slow_clk";

                timer@0 {
                        compatible = "atmel,tcb-timer";
                        reg = <0>, <1>;
                };

                timer@2 {
                        compatible = "atmel,tcb-timer";
                        reg = <2>;
                };
        };

    /* One interrupt per TC channel in a TC block: */
        tcb1: timer@fffdc000 {
                compatible = "atmel,at91rm9200-tcb", "simple-mfd", "syscon";
                #address-cells = <1>;
                #size-cells = <0>;
                reg = <0xfffdc000 0x100>;
                interrupts = <26 4>, <27 4>, <28 4>;
                clocks = <&tcb1_clk>, <&clk32k>;
                clock-names = "t0_clk", "slow_clk";

                timer@0 {
                        compatible = "atmel,tcb-timer";
                        reg = <0>;
                };

                timer@1 {
                        compatible = "atmel,tcb-timer";
                        reg = <1>;
                };

                pwm@2 {
                        compatible = "atmel,tcb-pwm";
                        reg = <2>;
                        #pwm-cells = <3>;
                };
         };
    /* TCB0 Capture with QDEC: */
        timer@f800c000 {
                compatible = "atmel,at91rm9200-tcb", "simple-mfd", "syscon";
                #address-cells = <1>;
                #size-cells = <0>;
                reg = <0xfff7c000 0x100>;
                interrupts = <18 4>;
                clocks = <&tcb0_clk>, <&clk32k>;
                clock-names = "t0_clk", "slow_clk";

                timer@0 {
                        compatible = "microchip,tcb-capture";
                        reg = <0>, <1>;
                };

                timer@2 {
                        compatible = "atmel,tcb-timer";
                        reg = <2>;
                };
        };