dt-bindings: convert rtc/faraday,ftrtc01 to yaml

Converts rtc/faraday,ftrtc01.txt to yaml.
This permits to detect some missing properties: reg, resets, interrupts
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NCorentin Labbe <clabbe@baylibre.com>
Reviewed-by: NRob Herring <robh@kernel.org>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20210510182505.3968936-1-clabbe@baylibre.com

Documentation/devicetree/bindings/rtc/faraday,ftrtc010.txt

-* Faraday Technology FTRTC010 Real Time Clock
-
-This RTC appears in for example the Storlink Gemini family of
-SoCs.
-
-Required properties:
-- compatible : Should be one of:
-  "faraday,ftrtc010"
-  "cortina,gemini-rtc", "faraday,ftrtc010"
-
-Optional properties:
-- clocks: when present should contain clock references to the
-  PCLK and EXTCLK clocks. Faraday calls the later CLK1HZ and
-  says the clock should be 1 Hz, but implementers actually seem
-  to choose different clocks here, like Cortina who chose
-  32768 Hz (a typical low-power clock).
-- clock-names: should name the clocks "PCLK" and "EXTCLK"
-  respectively.
-
-Examples:
-
-rtc@45000000 {
-	compatible = "cortina,gemini-rtc";
-	reg = <0x45000000 0x100>;
-	interrupts = <17 IRQ_TYPE_LEVEL_HIGH>;
-	clocks = <&foo 0>, <&foo 1>;
-	clock-names = "PCLK", "EXTCLK";
-};

Documentation/devicetree/bindings/rtc/faraday,ftrtc010.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/rtc/faraday,ftrtc010.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Faraday Technology FTRTC010 Real Time Clock
+
+maintainers:
+  - Linus Walleij <linus.walleij@linaro.org>
+
+description: |
+  This RTC appears in for example the Storlink Gemini family of SoCs.
+
+properties:
+  compatible:
+    oneOf:
+      - const: faraday,ftrtc010
+      - items:
+          - const: cortina,gemini-rtc
+          - const: faraday,ftrtc010
+
+  resets:
+    maxItems: 1
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    minItems: 2
+    items:
+      - description: PCLK clocks
+      - description: EXTCLK clocks. Faraday calls it CLK1HZ and says the clock
+          should be 1 Hz, but implementers actually seem to choose different
+          clocks here, like Cortina who chose 32768 Hz (a typical low-power clock).
+
+  clock-names:
+    items:
+      - const: "PCLK"
+      - const: "EXTCLK"
+
+required:
+  - compatible
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    rtc@45000000 {
+      compatible = "cortina,gemini-rtc", "faraday,ftrtc010";
+      reg = <0x45000000 0x100>;
+      interrupts = <17 IRQ_TYPE_LEVEL_HIGH>;
+      clocks = <&foo 0>, <&foo 1>;
+      clock-names = "PCLK", "EXTCLK";
+    };