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dt-bindings: rtc: stm32: add support for STM32H7

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This patch documents support for STM32H7 Real Time Clock.
It introduces a new compatible and rework clock definitions.
On STM32H7 we have a 'pclk' clock for register access, in addition to
the 'rtc_ck' clock.

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
This commit is contained in:
Amelie Delaunay 2017-07-06 10:47:44 +02:00 committed by Alexandre Belloni
parent 300a7735be
commit d2be279bcd
1 changed files with 27 additions and 5 deletions
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32
Documentation/devicetree/bindings/rtc/st,stm32-rtc.txt
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@ -1,17 +1,25 @@
STM32 Real Time Clock STM32 Real Time Clock
Required properties: Required properties:
- compatible: "st,stm32-rtc". - 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. - reg: address range of rtc register set.
- clocks: reference to the clock entry ck_rtc. - 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. - interrupt-parent: phandle for the interrupt controller.
- interrupts: rtc alarm interrupt. - interrupts: rtc alarm interrupt.
- st,syscfg: phandle for pwrcfg, mandatory to disable/enable backup domain - st,syscfg: phandle for pwrcfg, mandatory to disable/enable backup domain
(RTC registers) write protection. (RTC registers) write protection.
Optional properties (to override default ck_rtc parent clock): Optional properties (to override default rtc_ck parent clock):
- assigned-clocks: reference to the ck_rtc clock entry. - assigned-clocks: reference to the rtc_ck clock entry.
- assigned-clock-parents: phandle of the new parent clock of ck_rtc. - assigned-clock-parents: phandle of the new parent clock of rtc_ck.
Example: Example:
@ -25,3 +33,17 @@ Example:
interrupts = <17 1>; interrupts = <17 1>;
st,syscfg = <&pwrcfg>; 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>;
status = "disabled";
};