# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id:
http://devicetree.org/schemas/rtc/st,stm32-rtc.yaml#
$schema:
http://devicetree.org/meta-schemas/core.yaml#
title: STMicroelectronics STM32 Real Time Clock
maintainers:
- Gabriel Fernandez <gabriel.fernandez@foss.st.com>
properties:
compatible:
enum:
- st,stm32-rtc
- st,stm32h7-rtc
- st,stm32mp1-rtc
- st,stm32mp25-rtc
reg:
maxItems: 1
clocks:
minItems: 1
maxItems: 2
clock-names:
items:
- const: pclk
- const: rtc_ck
interrupts:
maxItems: 1
st,syscfg:
$ref: /schemas/types.yaml#/definitions/phandle-array
items:
minItems: 3
maxItems: 3
description: |
Phandle/offset/mask triplet. The phandle to pwrcfg used to
access control register at offset, and change the dbp (Disable Backup
Protection) bit represented by the mask, mandatory to disable/enable backup
domain (RTC registers) write protection.
assigned-clocks:
description: |
override default rtc_ck parent clock reference to the rtc_ck clock entry
maxItems: 1
assigned-clock-parents:
description: |
override default rtc_ck parent clock phandle of the new parent clock of rtc_ck
maxItems: 1
patternProperties:
"^rtc-[a-z]+-[0-9]+$":
type: object
$ref: /schemas/pinctrl/pinmux-node.yaml
description: |
Configuration of STM32 RTC pins description. STM32 RTC is able to output
some signals on specific pins:
- LSCO (Low Speed Clock Output) that allow to output LSE clock on a pin.
- Alarm out that allow to send a pulse on a pin when alarm A of the RTC
expires.
additionalProperties: false
properties:
function:
enum:
- lsco
- alarm-a
pins:
enum:
- out1
- out2
- out2_rmp
allOf:
- if:
properties:
compatible:
contains:
const: st,stm32-rtc
then:
properties:
clocks:
minItems: 1
maxItems: 1
clock-names: false
patternProperties:
"^rtc-[a-z]+-[0-9]+$": false
required:
- st,syscfg
- if:
properties:
compatible:
contains:
const: st,stm32h7-rtc
then:
properties:
clocks:
minItems: 2
maxItems: 2
patternProperties:
"^rtc-[a-z]+-[0-9]+$": false
required:
- clock-names
- st,syscfg
- if:
properties:
compatible:
contains:
enum:
- st,stm32mp1-rtc
- st,stm32mp25-rtc
then:
properties:
clocks:
minItems: 2
maxItems: 2
assigned-clocks: false
assigned-clock-parents: false
required:
- clock-names
required:
- compatible
- reg
- clocks
- interrupts
additionalProperties: false
examples:
- |
#include <dt-bindings/mfd/stm32f4-rcc.h>
#include <dt-bindings/clock/stm32fx-clock.h>
rtc@40002800 {
compatible = "st,stm32-rtc";
reg = <0x40002800 0x400>;
clocks = <&rcc 1 CLK_RTC>;
assigned-clocks = <&rcc 1 CLK_RTC>;
assigned-clock-parents = <&rcc 1 CLK_LSE>;
interrupt-parent = <&exti>;
interrupts = <17 1>;
st,syscfg = <&pwrcfg 0x00 0x100>;
};
- |
#include <dt-bindings/interrupt-controller/arm-gic.h>
#include <dt-bindings/clock/stm32mp1-clks.h>
rtc@5c004000 {
compatible = "st,stm32mp1-rtc";
reg = <0x5c004000 0x400>;
clocks = <&rcc RTCAPB>, <&rcc RTC>;
clock-names = "pclk", "rtc_ck";
interrupts = <GIC_SPI 3 IRQ_TYPE_LEVEL_HIGH>;
};
...
