dt-bindings: serial: Move omap-serial.txt to YAML schema

Convert serial-omap.txt to YAML schema for better checks and documentation.

Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Link: https://lore.kernel.org/r/20210610182227.2480-1-vigneshr@ti.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/serial/8250_omap.yaml

@@ -0,0 +1,118 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/serial/8250_omap.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Bindings for 8250 compliant UARTs on TI's OMAP2+ and K3 SoCs
+
+maintainers:
+  - Vignesh Raghavendra <vigneshr@ti.com>
+
+allOf:
+  - $ref: /schemas/serial/serial.yaml#
+  - $ref: /schemas/serial/rs485.yaml#
+
+properties:
+  compatible:
+    oneOf:
+      - enum:
+          - ti,am3352-uart
+          - ti,am4372-uart
+          - ti,am654-uart
+          - ti,dra742-uart
+          - ti,omap2-uart
+          - ti,omap3-uart
+          - ti,omap4-uart
+      - items:
+          - enum:
+              - ti,am64-uart
+              - ti,j721e-uart
+          - const: ti,am654-uart
+
+  ti,hwmods:
+    description:
+      Must be "uart<n>", n being the instance number (1-based)
+      This property is applicable only on legacy platforms mainly omap2/3
+      and ti81xx and should not be used on other platforms.
+    $ref: /schemas/types.yaml#/definitions/string
+    deprecated: true
+
+  dmas:
+    minItems: 1
+    maxItems: 2
+
+  dma-names:
+    items:
+      - const: tx
+      - const: rx
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    minItems: 1
+    maxItems: 2
+    description:
+      First entry is module IRQ required for normal IO operation.
+      Second entry is optional and corresponds to system wakeup IRQ
+      where supported.
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    const: fclk
+
+  rts-gpios: true
+  cts-gpios: true
+  dtr-gpios: true
+  dsr-gpios: true
+  rng-gpios: true
+  dcd-gpios: true
+  rs485-rts-delay: true
+  rs485-rts-active-low: true
+  rs485-rx-during-tx: true
+  rs485-rts-active-high: true
+  linux,rs485-enabled-at-boot-time: true
+  rts-gpio: true
+  power-domains: true
+  clock-frequency: true
+  current-speed: true
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+additionalProperties: false
+
+if:
+  properties:
+    compatible:
+      oneOf:
+        - const: ti,omap2-uart
+        - const: ti,omap3-uart
+        - const: ti,omap4-uart
+
+then:
+  properties:
+    ti,hwmods:
+      items:
+        - pattern: "^uart([1-9])$"
+
+else:
+  properties:
+    ti,hwmods: false
+
+examples:
+  - |
+          serial@49042000 {
+            compatible = "ti,omap3-uart";
+            reg = <0x49042000 0x400>;
+            interrupts = <80>;
+            dmas = <&sdma 81 &sdma 82>;
+            dma-names = "tx", "rx";
+            ti,hwmods = "uart4";
+            clock-frequency = <48000000>;
+          };

Documentation/devicetree/bindings/serial/omap_serial.txt

@@ -1,40 +0,0 @@
-OMAP UART controller
-
-Required properties:
-- compatible : should be "ti,am64-uart", "ti,am654-uart" for AM64 controllers
-- compatible : should be "ti,j721e-uart", "ti,am654-uart" for J721E controllers
-- compatible : should be "ti,am654-uart" for AM654 controllers
-- compatible : should be "ti,omap2-uart" for OMAP2 controllers
-- compatible : should be "ti,omap3-uart" for OMAP3 controllers
-- compatible : should be "ti,omap4-uart" for OMAP4 controllers
-- compatible : should be "ti,am4372-uart" for AM437x controllers
-- compatible : should be "ti,am3352-uart" for AM335x controllers
-- compatible : should be "ti,dra742-uart" for DRA7x controllers
-- reg : address and length of the register space
-- interrupts or interrupts-extended : Should contain the uart interrupt
-                                      specifier or both the interrupt
-                                      controller phandle and interrupt
-                                      specifier.
-- ti,hwmods : Must be "uart<n>", n being the instance number (1-based)
-
-Optional properties:
-- clock-frequency : frequency of the clock input to the UART
-- dmas : DMA specifier, consisting of a phandle to the DMA controller
-         node and a DMA channel number.
-- dma-names : "rx" for receive channel, "tx" for transmit channel.
-- rs485-rts-delay, rs485-rx-during-tx, linux,rs485-enabled-at-boot-time: see rs485.txt
-- rs485-rts-active-high: drive RTS high when sending (default is low).
-- clocks: phandle to the functional clock as per
-  Documentation/devicetree/bindings/clock/clock-bindings.txt
-
-Example:
-
-                uart4: serial@49042000 {
-                        compatible = "ti,omap3-uart";
-                        reg = <0x49042000 0x400>;
-                        interrupts = <80>;
-                        dmas = <&sdma 81 &sdma 82>;
-                        dma-names = "tx", "rx";
-                        ti,hwmods = "uart4";
-                        clock-frequency = <48000000>;
-                };