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+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/rtc/allwinner,sun6i-a31-rtc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Allwinner A31 RTC Device Tree Bindings
+
+maintainers:
+ - Chen-Yu Tsai <wens@csie.org>
+ - Maxime Ripard <maxime.ripard@bootlin.com>
+
+properties:
+ "#clock-cells":
+ const: 1
+
+ compatible:
+ oneOf:
+ - const: allwinner,sun6i-a31-rtc
+ - const: allwinner,sun8i-a23-rtc
+ - const: allwinner,sun8i-h3-rtc
+ - const: allwinner,sun8i-r40-rtc
+ - const: allwinner,sun8i-v3-rtc
+ - const: allwinner,sun50i-h5-rtc
+ - items:
+ - const: allwinner,sun50i-a64-rtc
+ - const: allwinner,sun8i-h3-rtc
+
+ reg:
+ maxItems: 1
+
+ interrupts:
+ minItems: 1
+ maxItems: 2
+ items:
+ - description: RTC Alarm 0
+ - description: RTC Alarm 1
+
+ clocks:
+ maxItems: 1
+
+ clock-output-names:
+ minItems: 1
+ maxItems: 3
+ description:
+ The RTC provides up to three clocks
+ - the Low Frequency Oscillator or LOSC, at index 0,
+ - the Low Frequency Oscillator External output (X32KFOUT in
+ the datasheet), at index 1,
+ - the Internal Oscillator, at index 2.
+
+allOf:
+ - $ref: "rtc.yaml#"
+ - if:
+ properties:
+ compatible:
+ contains:
+ const: allwinner,sun6i-a31-rtc
+
+ then:
+ properties:
+ clock-output-names:
+ minItems: 1
+ maxItems: 1
+
+ - if:
+ properties:
+ compatible:
+ contains:
+ enum:
+ - allwinner,sun8i-a23-rtc
+ - allwinner,sun8i-r40-rtc
+ - allwinner,sun8i-v3-rtc
+
+ then:
+ properties:
+ clock-output-names:
+ minItems: 2
+ maxItems: 2
+
+ - if:
+ properties:
+ compatible:
+ contains:
+ enum:
+ - allwinner,sun8i-h3-rtc
+ - allwinner,sun50i-h5-rtc
+
+ then:
+ properties:
+ clock-output-names:
+ minItems: 3
+ maxItems: 3
+
+ - if:
+ properties:
+ compatible:
+ contains:
+ const: allwinner,sun8i-r40-rtc
+
+ then:
+ properties:
+ interrupts:
+ minItems: 1
+ maxItems: 1
+
+ else:
+ properties:
+ interrupts:
+ minItems: 2
+ maxItems: 2
+
+required:
+ - "#clock-cells"
+ - compatible
+ - reg
+ - interrupts
+ - clocks
+ - clock-output-names
+
+additionalProperties: false
+
+examples:
+ - |
+ rtc: rtc@1f00000 {
+ compatible = "allwinner,sun6i-a31-rtc";
+ reg = <0x01f00000 0x400>;
+ interrupts = <0 40 4>, <0 41 4>;
+ clock-output-names = "osc32k";
+ clocks = <&ext_osc32k>;
+ #clock-cells = <1>;
+ };
+
+...