dt-bindings: serial: mtk-uart: Convert txt to json-schema

Convert the mtk-uart documentation from freeform text to a json-schema.
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20220524115019.97246-1-angelogioacchino.delregno@collabora.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/serial/mediatek,uart.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/serial/mediatek,uart.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MediaTek Universal Asynchronous Receiver/Transmitter (UART)
+
+maintainers:
+  - Matthias Brugger <matthias.bgg@gmail.com>
+
+allOf:
+  - $ref: serial.yaml#
+
+description: |
+  The MediaTek UART is based on the basic 8250 UART and compatible
+  with 16550A, with enhancements for high speed baud rates and
+  support for DMA.
+
+properties:
+  compatible:
+    oneOf:
+      - const: mediatek,mt6577-uart
+      - items:
+          - enum:
+              - mediatek,mt2701-uart
+              - mediatek,mt2712-uart
+              - mediatek,mt6580-uart
+              - mediatek,mt6582-uart
+              - mediatek,mt6589-uart
+              - mediatek,mt6755-uart
+              - mediatek,mt6765-uart
+              - mediatek,mt6779-uart
+              - mediatek,mt6795-uart
+              - mediatek,mt6797-uart
+              - mediatek,mt7622-uart
+              - mediatek,mt7623-uart
+              - mediatek,mt7629-uart
+              - mediatek,mt7986-uart
+              - mediatek,mt8127-uart
+              - mediatek,mt8135-uart
+              - mediatek,mt8173-uart
+              - mediatek,mt8183-uart
+              - mediatek,mt8186-uart
+              - mediatek,mt8192-uart
+              - mediatek,mt8195-uart
+              - mediatek,mt8516-uart
+          - const: mediatek,mt6577-uart
+
+  reg:
+    description: The base address of the UART register bank
+    maxItems: 1
+
+  clocks:
+    minItems: 1
+    items:
+      - description: The clock the baudrate is derived from
+      - description: The bus clock for register accesses
+
+  clock-names:
+    minItems: 1
+    items:
+      - const: baud
+      - const: bus
+
+  dmas:
+    items:
+      - description: phandle to TX DMA
+      - description: phandle to RX DMA
+
+  dma-names:
+    items:
+      - const: tx
+      - const: rx
+
+  interrupts:
+    minItems: 1
+    maxItems: 2
+
+  interrupt-names:
+    description:
+      The UART interrupt and optionally the RX in-band wakeup interrupt.
+    minItems: 1
+    items:
+      - const: uart
+      - const: wakeup
+
+  pinctrl-0: true
+  pinctrl-1: true
+
+  pinctrl-names:
+    minItems: 1
+    items:
+      - const: default
+      - const: sleep
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - interrupts
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    serial@11006000 {
+        compatible = "mediatek,mt6589-uart", "mediatek,mt6577-uart";
+        reg = <0x11006000 0x400>;
+        interrupts = <GIC_SPI 51 IRQ_TYPE_LEVEL_LOW>,
+                     <GIC_SPI 52 IRQ_TYPE_EDGE_FALLING>;
+        interrupt-names = "uart", "wakeup";
+        clocks = <&uart_clk>, <&bus_clk>;
+        clock-names = "baud", "bus";
+        pinctrl-0 = <&uart_pin>;
+        pinctrl-1 = <&uart_pin_sleep>;
+        pinctrl-names = "default", "sleep";
+    };

Documentation/devicetree/bindings/serial/mtk-uart.txt

-* MediaTek Universal Asynchronous Receiver/Transmitter (UART)
-
-Required properties:
-- compatible should contain:
-  * "mediatek,mt2701-uart" for MT2701 compatible UARTS
-  * "mediatek,mt2712-uart" for MT2712 compatible UARTS
-  * "mediatek,mt6580-uart" for MT6580 compatible UARTS
-  * "mediatek,mt6582-uart" for MT6582 compatible UARTS
-  * "mediatek,mt6589-uart" for MT6589 compatible UARTS
-  * "mediatek,mt6755-uart" for MT6755 compatible UARTS
-  * "mediatek,mt6765-uart" for MT6765 compatible UARTS
-  * "mediatek,mt6779-uart" for MT6779 compatible UARTS
-  * "mediatek,mt6795-uart" for MT6795 compatible UARTS
-  * "mediatek,mt6797-uart" for MT6797 compatible UARTS
-  * "mediatek,mt7622-uart" for MT7622 compatible UARTS
-  * "mediatek,mt7623-uart" for MT7623 compatible UARTS
-  * "mediatek,mt7629-uart" for MT7629 compatible UARTS
-  * "mediatek,mt7986-uart", "mediatek,mt6577-uart" for MT7986 compatible UARTS
-  * "mediatek,mt8127-uart" for MT8127 compatible UARTS
-  * "mediatek,mt8135-uart" for MT8135 compatible UARTS
-  * "mediatek,mt8173-uart" for MT8173 compatible UARTS
-  * "mediatek,mt8183-uart", "mediatek,mt6577-uart" for MT8183 compatible UARTS
-  * "mediatek,mt8186-uart", "mediatek,mt6577-uart" for MT8183 compatible UARTS
-  * "mediatek,mt8192-uart", "mediatek,mt6577-uart" for MT8192 compatible UARTS
-  * "mediatek,mt8195-uart", "mediatek,mt6577-uart" for MT8195 compatible UARTS
-  * "mediatek,mt8516-uart" for MT8516 compatible UARTS
-  * "mediatek,mt6577-uart" for MT6577 and all of the above
-
-- reg: The base address of the UART register bank.
-
-- interrupts:
-  index 0: an interrupt specifier for the UART controller itself
-  index 1: optional, an interrupt specifier with edge sensitivity on Rx pin to
-           support Rx in-band wake up. If one would like to use this feature,
-           one must create an addtional pinctrl to reconfigure Rx pin to normal
-           GPIO before suspend.
-
-- clocks : Must contain an entry for each entry in clock-names.
-  See ../clocks/clock-bindings.txt for details.
-- clock-names:
-  - "baud": The clock the baudrate is derived from
-  - "bus": The bus clock for register accesses (optional)
-
-For compatibility with older device trees an unnamed clock is used for the
-baud clock if the baudclk does not exist. Do not use this for new designs.
-
-Example:
-
-	uart0: serial@11006000 {
-		compatible = "mediatek,mt6589-uart", "mediatek,mt6577-uart";
-		reg = <0x11006000 0x400>;
-		interrupts = <GIC_SPI 51 IRQ_TYPE_LEVEL_LOW>,
-			     <GIC_SPI 52 IRQ_TYPE_EDGE_FALLING>;
-		clocks = <&uart_clk>, <&bus_clk>;
-		clock-names = "baud", "bus";
-		pinctrl-names = "default", "sleep";
-		pinctrl-0 = <&uart_pin>;
-		pinctrl-1 = <&uart_pin_sleep>;
-	};