dt-bindings: atmel-tcb: convert bindings to json-schema

* Device tree bindings for Atmel Timer Counter Blocks

- compatible: Should be "atmel,<chip>-tcb", "simple-mfd", "syscon".

  <chip> can be "at91rm9200" or "at91sam9x5"

- reg: Should contain registers location and length

- #address-cells: has to be 1

- #size-cells: has to be 0

- interrupts: Should contain all interrupts for the TC block

  Note that you can specify several interrupt cells if the TC

  block has one interrupt per channel.

- clock-names: tuple listing input clock names.

	Required elements: "t0_clk", "slow_clk"

	Optional elements: "t1_clk", "t2_clk"

- clocks: phandles to input clocks.

The TCB can expose multiple subdevices:

 * a timer

   - compatible: Should be "atmel,tcb-timer"

   - reg: Should contain the TCB channels to be used. If the

     counter width is 16 bits (at91rm9200-tcb), two consecutive

     channels are needed. Else, only one channel will be used.

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";

	};

# 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

      - 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.

    oneOf:

      - items:

        - const: t0_clk

        - const: slow_clk

      - items:

        - const: t0_clk

        - const: t1_clk

        - const: t2_clk

        - const: slow_clk

    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.

    type: object

    properties:

      compatible:

        const: atmel,tcb-timer

      reg:

        description:

          List of channels to use for this particular timer.

        minItems: 1

        maxItems: 3

    required:

      - compatible

      - reg

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>;

                };

        };