dt-bindings: arm: bcm: Convert BCM2835 firmware binding to YAML

Raspberry Pi VideoCore firmware driver

Required properties:

- compatible:		Should be "raspberrypi,bcm2835-firmware"

- mboxes:		Phandle to the firmware device's Mailbox.

			  (See: ../mailbox/mailbox.txt for more information)

Example:

firmware {

	compatible = "raspberrypi,bcm2835-firmware";

	mboxes = <&mailbox>;

};

# SPDX-License-Identifier: GPL-2.0

%YAML 1.2

---

$id: http://devicetree.org/schemas/arm/bcm/raspberrypi,bcm2835-firmware.yaml#

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

title: Raspberry Pi VideoCore firmware driver

maintainers:

  - Eric Anholt <eric@anholt.net>

  - Stefan Wahren <wahrenst@gmx.net>

properties:

  compatible:

    items:

      - const: raspberrypi,bcm2835-firmware

      - const: simple-bus

  mboxes:

    $ref: '/schemas/types.yaml#/definitions/phandle'

    description: |

      Phandle to the firmware device's Mailbox.

      (See: ../mailbox/mailbox.txt for more information)

required:

  - compatible

  - mboxes

examples:

  - |

    firmware {

        compatible = "raspberrypi,bcm2835-firmware", "simple-bus";

        mboxes = <&mailbox>;

    };

...