[PATCH 1/3] dt-bindings: rtc: Add sii,wakealarm-output-pin property for S35390A

[Markus Probst]

Synology NAS devices use the output pin for interrupt signal 1 to wake up
the system.

Move devicetree bindings for sii,s35390a into its own file.
Add sii,wakealarm-output-pin property to enable the use of the output
pin for interrupt signal 1 for the wake alarm, which makes it possible to
set an wake alarm on Synology NAS devices.

Signed-off-by: Markus Probst <markus.probst at posteo.de>
---
 .../devicetree/bindings/rtc/sii,s35390a.yaml       | 54 ++++++++++++++++++++++
 .../devicetree/bindings/rtc/trivial-rtc.yaml       |  3 --
 MAINTAINERS                                        |  1 +
 include/dt-bindings/rtc/s35390a.h                  |  9 ++++
 4 files changed, 64 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/rtc/sii,s35390a.yaml b/Documentation/devicetree/bindings/rtc/sii,s35390a.yaml
new file mode 100644
index 000000000000..31a578673870
--- /dev/null
+++ b/Documentation/devicetree/bindings/rtc/sii,s35390a.yaml
@@ -0,0 +1,54 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/rtc/sii,s35390a.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: S-35390A 2-WIRE REAL-TIME CLOCK
+
+maintainers:
+  - Alexandre Belloni <alexandre.belloni at bootlin.com>
+
+description:
+  The S-35390A is a CMOS 2-wire real-time clock IC which operates with the
+  very low current consumption in the wide range of operation voltage.
+
+allOf:
+  - $ref: rtc.yaml#
+
+properties:
+  compatible:
+    const: sii,s35390a
+
+  reg:
+    maxItems: 1
+
+  sii,wakealarm-output-pin:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [1, 2]
+    description: |
+      The output pin to wake up the system.
+      Default will use the output pin for interrupt signal 2.
+        <S35390A_OUTPUT_PIN_INT1> : Output pin for interrupt signal 1
+        <S35390A_OUTPUT_PIN_INT2> : Output pin for interrupt signal 2
+
+required:
+  - compatible
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/rtc/s35390a.h>
+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        rtc: rtc at 30 {
+            compatible = "sii,s35390a";
+            reg = <0x30>;
+            sii,wakealarm-output-pin = <S35390A_OUTPUT_PIN_INT2>;
+        };
+    };
diff --git a/Documentation/devicetree/bindings/rtc/trivial-rtc.yaml b/Documentation/devicetree/bindings/rtc/trivial-rtc.yaml
index f4d0eed98a08..7b3f682ef4d5 100644
--- a/Documentation/devicetree/bindings/rtc/trivial-rtc.yaml
+++ b/Documentation/devicetree/bindings/rtc/trivial-rtc.yaml
@@ -81,8 +81,6 @@ properties:
       - ricoh,rv5c386
       # I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC
       - ricoh,rv5c387a
-      # 2-wire CMOS real-time clock
-      - sii,s35390a
       # ST SPEAr Real-time Clock
       - st,spear600-rtc
       # VIA/Wondermedia VT8500 Real-time Clock
@@ -105,5 +103,4 @@ required:
   - reg
 
 additionalProperties: false
-
 ...
diff --git a/MAINTAINERS b/MAINTAINERS
index 15011f5752a9..46a19a0873e0 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -22690,6 +22690,7 @@ T:	git git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux.git
 F:	Documentation/admin-guide/rtc.rst
 F:	Documentation/devicetree/bindings/rtc/
 F:	drivers/rtc/
+F:	include/dt-bindings/rtc/
 F:	include/linux/rtc.h
 F:	include/linux/rtc/
 F:	include/uapi/linux/rtc.h
diff --git a/include/dt-bindings/rtc/s35390a.h b/include/dt-bindings/rtc/s35390a.h
new file mode 100644
index 000000000000..bd99db118d31
--- /dev/null
+++ b/include/dt-bindings/rtc/s35390a.h
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) */
+
+#ifndef __DT_BINDINGS_RTC_S35390A_H
+#define __DT_BINDINGS_RTC_S35390A_H
+
+#define S35390A_OUTPUT_PIN_INT1	1
+#define S35390A_OUTPUT_PIN_INT2	2
+
+#endif /* __DT_BINDINGS_RTC_S35390A_H */

-- 
2.54.0