The MediaTek MT6685 PM / Clock IC contains various SPMI sub
devices, of which two are Real Time Clock IPs, one usually
reserved for the secure world and one for the unsecured one,
reachable at different SPMI addresses.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
---

NOTE: This does not contain any example because the MT6685 RTC
      will be added to the mfd binding for MediaTek SPMI PMICs
      and examples will be there.

** For reviewing purposes, this is how the example will look like: **

  - |
    #include <dt-bindings/interrupt-controller/irq.h>
    #include <dt-bindings/spmi/spmi.h>

    spmi {
      #address-cells = <2>;
      #size-cells = <0>;

      pmic@9 {
        compatible = "mediatek,mt6363";
        reg = <0x9 SPMI_USID>;
        interrupts = <9 1 IRQ_TYPE_LEVEL_HIGH>;
        interrupt-controller;
        #address-cells = <1>;
        #interrupt-cells = <3>;
        #size-cells = <0>;

        clock-controller@514 {
          compatible = "mediatek,mt6685-sck-top";
          reg = <0x514>;
          #clock-cells = <1>;
        };

        rtc@580 {
          compatible = "mediatek,mt6685-rtc";
          reg = <0x580>;
          interrupts = <9 0 IRQ_TYPE_LEVEL_HIGH>;
        };
      };
    };

 .../bindings/rtc/mediatek,mt6685-rtc.yaml     | 33 +++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/rtc/mediatek,mt6685-rtc.yaml

diff --git a/Documentation/devicetree/bindings/rtc/mediatek,mt6685-rtc.yaml b/Documentation/devicetree/bindings/rtc/mediatek,mt6685-rtc.yaml
new file mode 100644
index 000000000000..1aec163b251a
--- /dev/null
+++ b/Documentation/devicetree/bindings/rtc/mediatek,mt6685-rtc.yaml

@@ -0,0 +1,33 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/rtc/mediatek,mt6685-rtc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MediaTek MT6685 PM/Clock IC Real Time Clock
+
+allOf:
+  - $ref: rtc.yaml#
+
+maintainers:
+  - AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
+
+properties:
+  compatible:
+    const: mediatek,mt6685-rtc
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+unevaluatedProperties: false

-- 
2.51.1