dt-bindings: rtc: Add DT binding m48t86 rtc

Add YAML bindings for ST M48T86 / Dallas DS12887 RTC.

Signed-off-by: Nikita Shubin <nikita.shubin@maquefel.me>

diff --git a/Documentation/devicetree/bindings/rtc/dallas,rtc-m48t86.yaml b/Documentation/devicetree/bindings/rtc/dallas,rtc-m48t86.yaml
new file mode 100644 (file)
index 0000000..51f98bd
--- /dev/null
+++ b/Documentation/devicetree/bindings/rtc/dallas,rtc-m48t86.yaml
@@ -0,0 +1,33 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/rtc/dallas,rtc-m48t86.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ST M48T86 / Dallas DS12887 RTC bindings
+
+maintainers:
+  - Alessandro Zummo <a.zummo@towertech.it>
+
+properties:
+  compatible:
+    const: dallas,rtc-m48t86
+
+  reg:
+    maxItems: 2
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    rtc1: rtc@10800000 {
+        compatible = "dallas,rtc-m48t86";
+        reg = <0x10800000 0x1>, <0x11700000 0x1>;
+    };
+
+...
+