STM32 Real Time Clock
|
|
Required properties:
|
- compatible: can be one of the following:
|
- "st,stm32-rtc" for devices compatible with stm32(f4/f7).
|
- "st,stm32h7-rtc" for devices compatible with stm32h7.
|
- "st,stm32mp1-rtc" for devices compatible with stm32mp1.
|
- reg: address range of rtc register set.
|
- clocks: can use up to two clocks, depending on part used:
|
- "rtc_ck": RTC clock source.
|
- "pclk": RTC APB interface clock.
|
It is not present on stm32(f4/f7).
|
It is required on stm32(h7/mp1).
|
- clock-names: must be "rtc_ck" and "pclk".
|
It is required on stm32(h7/mp1).
|
- interrupts: rtc alarm interrupt. On stm32mp1, a second interrupt is required
|
for rtc alarm wakeup interrupt.
|
- st,syscfg: 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.
|
It is required on stm32(f4/f7/h7).
|
|
Optional properties (to override default rtc_ck parent clock on stm32(f4/f7/h7):
|
- 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 0x00 0x100>;
|
};
|
|
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 0x00 0x100>;
|
};
|
|
rtc: rtc@5c004000 {
|
compatible = "st,stm32mp1-rtc";
|
reg = <0x5c004000 0x400>;
|
clocks = <&rcc RTCAPB>, <&rcc RTC>;
|
clock-names = "pclk", "rtc_ck";
|
interrupts-extended = <&intc GIC_SPI 3 IRQ_TYPE_NONE>,
|
<&exti 19 1>;
|
};
|
