From: Amelie Delaunay <amelie.delaunay@xxxxxxxxxxx>
STM32 RTC has three output pins: RTC_OUT1, RTC_OUT2 or RTC_OUT2_RMP.
RTC Low-Speed Clock Output (LSCO) can be output on RTC_OUT1 or
RTC_OUT2_RMP.
This patch adds constants for RTC output bindings and adds st,lsco
optional property for stm32 rtc driver, to select and enable LSCO.
A pinctrl state is also optional to reserve pin for RTC output.
Signed-off-by: Amelie Delaunay <amelie.delaunay@xxxxxxxxxxx>
Signed-off-by: Valentin Caron <valentin.caron@xxxxxxxxxxx>
---
.../devicetree/bindings/rtc/st,stm32-rtc.yaml | 20 +++++++++++++++++++
include/dt-bindings/rtc/rtc-stm32.h | 14 +++++++++++++
2 files changed, 34 insertions(+)
create mode 100644 include/dt-bindings/rtc/rtc-stm32.h
diff --git a/Documentation/devicetree/bindings/rtc/st,stm32-rtc.yaml b/Documentation/devicetree/bindings/rtc/st,stm32-rtc.yaml
index 764717ce1873..56d46ea35c5d 100644
--- a/Documentation/devicetree/bindings/rtc/st,stm32-rtc.yaml
+++ b/Documentation/devicetree/bindings/rtc/st,stm32-rtc.yaml
@@ -52,6 +52,13 @@ properties:
override default rtc_ck parent clock phandle of the new parent clock of rtc_ck
maxItems: 1
+ st,lsco:
+ $ref: "/schemas/types.yaml#/definitions/uint32"
+ description: |
+ To select and enable RTC Low Speed Clock Output.
+ Refer to <include/dt-bindings/rtc/rtc-stm32.h> for the supported values.
+ Pinctrl state named "default" may be defined to reserve pin for RTC output.
+
allOf:
- if:
properties:
@@ -65,6 +72,9 @@ allOf:
minItems: 1
maxItems: 1
+ st,lsco:
+ maxItems: 0
+
clock-names: false
required:
@@ -82,6 +92,9 @@ allOf:
minItems: 2
maxItems: 2
+ st,lsco:
+ maxItems: 0
+
required:
- clock-names
- st,syscfg
@@ -101,6 +114,9 @@ allOf:
assigned-clocks: false
assigned-clock-parents: false
+ st,lsco:
+ maxItems: 1
+
required:
- clock-names
@@ -130,12 +146,16 @@ examples:
- |
#include <dt-bindings/interrupt-controller/arm-gic.h>
#include <dt-bindings/clock/stm32mp1-clks.h>
+ #include <dt-bindings/rtc/rtc-stm32.h>
rtc@5c004000 {
compatible = "st,stm32mp1-rtc";
reg = <0x5c004000 0x400>;
clocks = <&rcc RTCAPB>, <&rcc RTC>;
clock-names = "pclk", "rtc_ck";
interrupts = <GIC_SPI 3 IRQ_TYPE_LEVEL_HIGH>;
+ st,lsco = <RTC_OUT2_RMP>;
+ pinctrl-0 = <&rtc_out2_rmp_pins_a>;
+ pinctrl-names = "default";
};
...
diff --git a/include/dt-bindings/rtc/rtc-stm32.h b/include/dt-bindings/rtc/rtc-stm32.h
new file mode 100644
index 000000000000..2fd78c2e62d4
--- /dev/null
+++ b/include/dt-bindings/rtc/rtc-stm32.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * This header provides constants for STM32_RTC bindings.
+ */
+
+#ifndef _DT_BINDINGS_RTC_RTC_STM32_H
+#define _DT_BINDINGS_RTC_RTC_STM32_H
+
+#define RTC_NO_OUT 0
+#define RTC_OUT1 1
+#define RTC_OUT2 2
+#define RTC_OUT2_RMP 3
+
+#endif
--
2.25.1
