[PATCH 2/3] dt-bindings: rtc: update stm32-rtc documentation for stm32mp1 rtc

[Amelie Delaunay]

RTC embedded in stm32mp1 SoC is slightly different from stm32h7 one, it
doesn't require to disable backup domain write protection, and rtc_ck
parent clock assignment isn't allowed.
To sum up, stm32mp1 RTC requires 2 clocks, pclk and rtc_ck, and an RTC
alarm interrupt.

Signed-off-by: Amelie Delaunay <amelie.delaunay at st.com>
---
 .../devicetree/bindings/rtc/st,stm32-rtc.txt       | 27 +++++++++++++++++-----
 1 file changed, 21 insertions(+), 6 deletions(-)

diff --git a/Documentation/devicetree/bindings/rtc/st,stm32-rtc.txt b/Documentation/devicetree/bindings/rtc/st,stm32-rtc.txt
index 00f8b5d..f1c2080 100644
--- a/Documentation/devicetree/bindings/rtc/st,stm32-rtc.txt
+++ b/Documentation/devicetree/bindings/rtc/st,stm32-rtc.txt
@@ -1,25 +1,31 @@
 STM32 Real Time Clock
 
 Required properties:
-- compatible: can be either "st,stm32-rtc" or "st,stm32h7-rtc", depending on
-  the device is compatible with stm32(f4/f7) or stm32h7.
+- compatible: can be "st,stm32-rtc", "st,stm32h7-rtc" or "st,stm32mp1-rtc",
+	      depending on the device is compatible with stm32(f4/f7), stm32h7
+	      or stm32mp1.
 - reg: address range of rtc register set.
 - 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.
+    It is required on stm32(f4/f7/h7/mp1).
   - "pclk": RTC APB interface clock.
     It is not present on stm32(f4/f7).
-    It is required on stm32h7.
+    It is required on stm32(h7/mp1).
 - clock-names: must be "rtc_ck" and "pclk".
-    It is required only on stm32h7.
+    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.
+- interrupts-extended: replace interrupts property on stm32mp1, to specify rtc
+  alarm wakeup interrupt, which is on exti interrupt controller instead of gic.
+    It is required on stm32mp1.
 - 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):
+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.
 
@@ -48,3 +54,12 @@ Example:
 		interrupt-names = "alarm";
 		st,syscfg = <&pwrcfg 0x00 0x100>;
 	};
+
+	rtc: rtc at 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>;
+	};
-- 
2.7.4