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authorAmelie Delaunay <amelie.delaunay@st.com>2017-07-06 10:47:44 +0200
committerAlexandre Belloni <alexandre.belloni@free-electrons.com>2017-07-06 22:52:52 +0200
commitd2be279bcd8055ddfd92cc5f5d305eb3651e059b (patch)
tree7e209024ddb1603a2377bdb923fae5b21963e702 /Documentation/devicetree/bindings/rtc/st,stm32-rtc.txt
parentrtc: ds1307: add ds1308 variant (diff)
downloadlinux-dev-d2be279bcd8055ddfd92cc5f5d305eb3651e059b.tar.xz
linux-dev-d2be279bcd8055ddfd92cc5f5d305eb3651e059b.zip
dt-bindings: rtc: stm32: add support for STM32H7
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>
Diffstat (limited to 'Documentation/devicetree/bindings/rtc/st,stm32-rtc.txt')
-rw-r--r--Documentation/devicetree/bindings/rtc/st,stm32-rtc.txt32
1 files changed, 27 insertions, 5 deletions
diff --git a/Documentation/devicetree/bindings/rtc/st,stm32-rtc.txt b/Documentation/devicetree/bindings/rtc/st,stm32-rtc.txt
index e2837b951237..0a4c371a9b7a 100644
--- a/Documentation/devicetree/bindings/rtc/st,stm32-rtc.txt
+++ b/Documentation/devicetree/bindings/rtc/st,stm32-rtc.txt
@@ -1,17 +1,25 @@
STM32 Real Time Clock
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.
-- 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.
- 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.
+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:
@@ -25,3 +33,17 @@ Example:
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>;
+ status = "disabled";
+ };