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STM32 Real Time Clock
Required properties:
- compatible: can be either "st,stm32-rtc" or "st,stm32h7-rtc", depending on
the device is compatible with stm32(f4/f7) or stm32h7.
- reg: address range of rtc register set.
- clocks: can use up to two clocks, depending on part used:
- "rtc_ck": RTC clock source.
It is required on stm32(f4/f7) and stm32h7.
- "pclk": RTC APB interface clock.
It is not present on stm32(f4/f7).
It is required on stm32h7.
- clock-names: must be "rtc_ck" and "pclk".
It is required only on stm32h7.
- interrupt-parent: phandle for the interrupt controller.
- interrupts: rtc alarm interrupt.
- st,syscfg: phandle for pwrcfg, mandatory to disable/enable backup domain
(RTC registers) write protection.
Optional properties (to override default rtc_ck parent clock):
- assigned-clocks: reference to the rtc_ck clock entry.
- assigned-clock-parents: phandle of the new parent clock of rtc_ck.
Example:
rtc: 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>;
};
rtc: rtc@58004000 {
compatible = "st,stm32h7-rtc";
reg = <0x58004000 0x400>;
clocks = <&rcc RTCAPB_CK>, <&rcc RTC_CK>;
clock-names = "pclk", "rtc_ck";
assigned-clocks = <&rcc RTC_CK>;
assigned-clock-parents = <&rcc LSE_CK>;
interrupt-parent = <&exti>;
interrupts = <17 1>;
interrupt-names = "alarm";
st,syscfg = <&pwrcfg>;
};
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