dt-bindings: timer: Convert stm32 timer bindings to json-schema

. STMicroelectronics STM32 timer

The STM32 MCUs family has several general-purpose 16 and 32 bits timers.

Required properties:

- compatible : Should be "st,stm32-timer"

- reg : Address and length of the register set

- clocks : Reference on the timer input clock

- interrupts : Reference to the timer interrupt

Optional properties:

- resets: Reference to a reset controller asserting the timer

Example:

timer5: timer@40000c00 {

	compatible = "st,stm32-timer";

	reg = <0x40000c00 0x400>;

	interrupts = <50>;

	resets = <&rrc 259>;

	clocks = <&clk_pmtr1>;

};

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)

%YAML 1.2

---

$id: http://devicetree.org/schemas/timer/st,stm32-timer.yaml#

$schema: http://devicetree.org/meta-schemas/core.yaml#

title: STMicroelectronics STM32 general-purpose 16 and 32 bits timers bindings

maintainers:

  - Benjamin Gaignard <benjamin.gaignard@st.com>

properties:

  compatible:

    const: st,stm32-timer

  reg:

    maxItems: 1

  interrupts:

    maxItems: 1

  clocks:

    maxItems: 1

  resets:

    maxItems: 1

required:

  - compatible

  - reg

  - interrupts

  - clocks

additionalProperties: false

examples:

  - |

    #include <dt-bindings/interrupt-controller/arm-gic.h>

    #include <dt-bindings/clock/stm32mp1-clks.h>

    timer: timer@40000c00 {

        compatible = "st,stm32-timer";

        reg = <0x40000c00 0x400>;

        interrupts = <50>;

        clocks = <&clk_pmtr1>;

    };

...