dt-bindings: pwm: convert pwm-bcm2835 bindings to YAML

BCM2835 PWM controller (Raspberry Pi controller)

Required properties:

- compatible: should be "brcm,bcm2835-pwm"

- reg: physical base address and length of the controller's registers

- clocks: This clock defines the base clock frequency of the PWM hardware

  system, the period and the duty_cycle of the PWM signal is a multiple of

  the base period.

- #pwm-cells: Should be 3. See pwm.yaml in this directory for a description of

  the cells format.

Examples:

pwm@2020c000 {

	compatible = "brcm,bcm2835-pwm";

	reg = <0x2020c000 0x28>;

	clocks = <&clk_pwm>;

	#pwm-cells = <3>;

};

clocks {

	....

		clk_pwm: pwm {

			compatible = "fixed-clock";

			reg = <3>;

			#clock-cells = <0>;

			clock-frequency = <9200000>;

		};

	....

};

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

%YAML 1.2

---

$id: http://devicetree.org/schemas/pwm/pwm-bcm2835.yaml#

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

title: BCM2835 PWM controller (Raspberry Pi controller)

maintainers:

  - Stefan Wahren <stefan.wahren@i2se.com>

allOf:

  - $ref: pwm.yaml#

properties:

  compatible:

    const: brcm,bcm2835-pwm

  reg:

    maxItems: 1

  clocks:

    maxItems: 1

  "#pwm-cells":

    const: 3

required:

  - compatible

  - reg

  - clocks

  - "#pwm-cells"

additionalProperties: false

examples:

  - |

    pwm@2020c000 {

      compatible = "brcm,bcm2835-pwm";

      reg = <0x2020c000 0x28>;

      clocks = <&clk_pwm>;

      #pwm-cells = <3>;

    };