ASoC: Add bindings for Samsung Aries audio complex

The audio system on S5PV210 Aries boards have a wm8994 codec connected
to the Samsung I2S0 DAI.  Jack detection is done via GPIOs, an ADC, and
an extcon device (fsa9480).

There are two main variants, one with an FM radio and where the wm8994 is
the master for the modem audio and the other without FM and the modem is
the master.
Signed-off-by: Jonathan Bakker <xc-racer2@live.ca>
Link: https://lore.kernel.org/r/BN6PR04MB0660866A9B5FD4B9E74D7C31A39F0@BN6PR04MB0660.namprd04.prod.outlook.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/samsung,aries-wm8994.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/samsung,aries-wm8994.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Samsung Aries audio complex with WM8994 codec
+
+maintainers:
+  - Jonathan Bakker <xc-racer2@live.ca>
+
+properties:
+  compatible:
+    oneOf:
+      - const: samsung,aries-wm8994
+        description: With FM radio and modem master
+
+      - const: samsung,fascinate4g-wm8994
+        description: Without FM radio and modem slave
+
+  model:
+    $ref: /schemas/types.yaml#/definitions/string
+    description: The user-visible name of this sound complex.
+
+  cpu:
+    type: object
+    properties:
+      sound-dai:
+        minItems: 2
+        maxItems: 2
+        $ref: /schemas/types.yaml#/definitions/phandle-array
+        description: |
+          phandles to the I2S controller and bluetooth codec,
+          in that order
+
+  codec:
+    type: object
+    properties:
+      sound-dai:
+        $ref: /schemas/types.yaml#/definitions/phandle-array
+        description: phandle to the WM8994 CODEC
+
+  samsung,audio-routing:
+    $ref: /schemas/types.yaml#/definitions/non-unique-string-array
+    description: |
+      List of the connections between audio
+      components;  each entry is a pair of strings, the first being the
+      connection's sink, the second being the connection's source;
+      valid names for sources and sinks are the WM8994's pins (as
+      documented in its binding), and the jacks on the board -
+      For samsung,aries-wm8994: HP, SPK, RCV, LINE, Main Mic, Headset Mic,
+      or FM In
+      For samsung,fascinate4g-wm8994: HP, SPK, RCV, LINE, Main Mic,
+      or HeadsetMic
+
+  extcon:
+    description: Extcon phandle for dock detection
+
+  main-micbias-supply:
+    description: Supply for the micbias on the main mic
+
+  headset-micbias-supply:
+    description: Supply for the micbias on the headset mic
+
+  earpath-sel-gpios:
+    description: GPIO for switching between tv-out and mic paths
+
+  headset-detect-gpios:
+    description: GPIO for detection of headset insertion
+
+  headset-key-gpios:
+    description: GPIO for detection of headset key press
+
+  io-channels:
+    maxItems: 1
+    description: IO channel to read micbias voltage for headset detection
+
+  io-channel-names:
+    const: headset-detect
+
+required:
+  - compatible
+  - model
+  - cpu
+  - codec
+  - samsung,audio-routing
+  - extcon
+  - main-micbias-supply
+  - headset-micbias-supply
+  - earpath-sel-gpios
+  - headset-detect-gpios
+  - headset-key-gpios
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    sound {
+        compatible = "samsung,fascinate4g-wm8994";
+
+        model = "Fascinate4G";
+
+        extcon = <&fsa9480>;
+
+        main-micbias-supply = <&main_micbias_reg>;
+        headset-micbias-supply = <&headset_micbias_reg>;
+
+        earpath-sel-gpios = <&gpj2 6 GPIO_ACTIVE_HIGH>;
+
+        io-channels = <&adc 3>;
+        io-channel-names = "headset-detect";
+        headset-detect-gpios = <&gph0 6 GPIO_ACTIVE_HIGH>;
+        headset-key-gpios = <&gph3 6 GPIO_ACTIVE_HIGH>;
+
+        samsung,audio-routing =
+            "HP", "HPOUT1L",
+            "HP", "HPOUT1R",
+
+            "SPK", "SPKOUTLN",
+            "SPK", "SPKOUTLP",
+
+            "RCV", "HPOUT2N",
+            "RCV", "HPOUT2P",
+
+            "LINE", "LINEOUT2N",
+            "LINE", "LINEOUT2P",
+
+            "IN1LP", "Main Mic",
+            "IN1LN", "Main Mic",
+
+            "IN1RP", "Headset Mic",
+            "IN1RN", "Headset Mic";
+
+        pinctrl-names = "default";
+        pinctrl-0 = <&headset_det &earpath_sel>;
+
+        cpu {
+            sound-dai = <&i2s0>, <&bt_codec>;
+        };
+
+        codec {
+            sound-dai = <&wm8994>;
+        };
+    };
+