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# 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>;
};
};
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