dt-bindings: nvmem: Convert STM32 ROMEM to json-schema

STMicroelectronics STM32 Factory-programmed data device tree bindings

This represents STM32 Factory-programmed read only non-volatile area: locked

flash, OTP, read-only HW regs... This contains various information such as:

analog calibration data for temperature sensor (e.g. TS_CAL1, TS_CAL2),

internal vref (VREFIN_CAL), unique device ID...

Required properties:

- compatible:		Should be one of:

			"st,stm32f4-otp"

			"st,stm32mp15-bsec"

- reg:			Offset and length of factory-programmed area.

- #address-cells:	Should be '<1>'.

- #size-cells:		Should be '<1>'.

Optional Data cells:

- Must be child nodes as described in nvmem.txt.

Example on stm32f4:

	romem: nvmem@1fff7800 {

		compatible = "st,stm32f4-otp";

		reg = <0x1fff7800 0x400>;

		#address-cells = <1>;

		#size-cells = <1>;

		/* Data cells: ts_cal1 at 0x1fff7a2c */

		ts_cal1: calib@22c {

			reg = <0x22c 0x2>;

		};

		...

	};

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

%YAML 1.2

---

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

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

title: STMicroelectronics STM32 Factory-programmed data bindings

description: |

  This represents STM32 Factory-programmed read only non-volatile area: locked

  flash, OTP, read-only HW regs... This contains various information such as:

  analog calibration data for temperature sensor (e.g. TS_CAL1, TS_CAL2),

  internal vref (VREFIN_CAL), unique device ID...

maintainers:

  - Fabrice Gasnier <fabrice.gasnier@st.com>

allOf:

  - $ref: "nvmem.yaml#"

properties:

  compatible:

    enum:

      - st,stm32f4-otp

      - st,stm32mp15-bsec

required:

  - "#address-cells"

  - "#size-cells"

  - compatible

  - reg

examples:

  - |

    efuse@1fff7800 {

      compatible = "st,stm32f4-otp";

      reg = <0x1fff7800 0x400>;

      #address-cells = <1>;

      #size-cells = <1>;

      calib@22c {

        reg = <0x22c 0x2>;

      };

    };

...