dt-bindings: mfd: Add NXP BBNSM

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

%YAML 1.2

---

$id: http://devicetree.org/schemas/mfd/nxp,bbnsm.yaml#

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

title: NXP Battery-Backed Non-Secure Module

maintainers:

  - Jacky Bai <ping.bai@nxp.com>

description: |

  NXP BBNSM serves as non-volatile logic and storage for the system.

  it Intergrates RTC & ON/OFF control.

  The RTC can retain its state and continues counting even when the

  main chip is power down. A time alarm is generated once the most

  significant 32 bits of the real-time counter match the value in the

  Time Alarm register.

  The ON/OFF logic inside the BBNSM allows for connecting directly to

  a PMIC or other voltage regulator device. both smart PMIC mode and

  Dumb PMIC mode supported.

properties:

  compatible:

    items:

      - enum:

          - nxp,imx93-bbnsm

      - const: syscon

      - const: simple-mfd

  reg:

    maxItems: 1

  rtc:

    type: object

    $ref: /schemas/rtc/rtc.yaml#

    properties:

      compatible:

        enum:

          - nxp,imx93-bbnsm-rtc

      interrupts:

        maxItems: 1

      start-year: true

    required:

      - compatible

      - interrupts

    additionalProperties: false

  pwrkey:

    type: object

    $ref: /schemas/input/input.yaml#

    properties:

      compatible:

        enum:

          - nxp,imx93-bbnsm-pwrkey

      interrupts:

        maxItems: 1

      linux,code: true

    required:

      - compatible

      - interrupts

    additionalProperties: false

required:

  - compatible

  - reg

  - rtc

  - pwrkey

additionalProperties: false

examples:

  - |

    #include <dt-bindings/input/linux-event-codes.h>

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

    bbnsm: bbnsm@44440000 {

        compatible = "nxp,imx93-bbnsm", "syscon", "simple-mfd";

        reg = <0x44440000 0x10000>;

        bbnsm_rtc: rtc {

            compatible = "nxp,imx93-bbnsm-rtc";

            interrupts = <GIC_SPI 73 IRQ_TYPE_LEVEL_HIGH>;

        };

        bbnsm_pwrkey: pwrkey {

            compatible = "nxp,imx93-bbnsm-pwrkey";

            interrupts = <GIC_SPI 73 IRQ_TYPE_LEVEL_HIGH>;

            linux,code = <KEY_POWER>;

        };

    };