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Commit 7c609305 authored by Amelie Delaunay's avatar Amelie Delaunay Committed by Alexandre Belloni
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dt-bindings: document the STM32 RTC bindings 



This patch adds documentation of device tree bindings for the STM32 RTC.

Signed-off-by: default avatarAmelie Delaunay <amelie.delaunay@st.com>
Acked-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@free-electrons.com>
parent d748c981

Documentation/devicetree/bindings/rtc/st,stm32-rtc.txt

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STM32 Real Time Clock



Required properties:

- compatible: "st,stm32-rtc".

- reg: address range of rtc register set.

- clocks: reference to the clock entry ck_rtc.

- 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 ck_rtc parent clock):

- assigned-clocks: reference to the ck_rtc clock entry.

- assigned-clock-parents: phandle of the new parent clock of ck_rtc.



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>;

	};