Kernel-4.18.0-80.el8_st,stm32-rtc

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).
• interrupt-parent: phandle for the interrupt controller.
  It is required on stm32(f4/f7/h7).
• 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>;
};