dt-bindings: arm: stm32: Convert stm32-syscon to json-schema

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

%YAML 1.2

---

$id: "http://devicetree.org/schemas/arm/stm32/st,stm32-syscon.yaml#"

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

title: STMicroelectronics STM32 Platforms System Controller bindings

maintainers:

  - Alexandre Torgue <alexandre.torgue@st.com>

  - Christophe Roullier <christophe.roullier@st.com>

properties:

  compatible:

    oneOf:

      - items:

        - enum:

          - st,stm32mp157-syscfg

        - const: syscon

  reg:

    maxItems: 1

  clocks:

    maxItems: 1

required:

  - compatible

  - reg

  - clocks

examples:

  - |

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

    syscfg: syscon@50020000 {

        compatible = "st,stm32mp157-syscfg", "syscon";

        reg = <0x50020000 0x400>;

        clocks = <&rcc SYSCFG>;

    };

...

STMicroelectronics STM32 Platforms System Controller

Properties:

   - compatible : should contain two values. First value must be :

                 - " st,stm32mp157-syscfg " - for stm32mp157 based SoCs,

                 second value must be always "syscon".

   - reg : offset and length of the register set.

   - clocks: phandle to the syscfg clock

 Example:

         syscfg: syscon@50020000 {

                 compatible = "st,stm32mp157-syscfg", "syscon";

                 reg = <0x50020000 0x400>;

                 clocks = <&rcc SYSCFG>;

         };