dt-bindings: sound: add Microsemi ZL38060 binding

Add devicetree binding for the Microsemi ZL38060 Connected
Home Audio Processor.
Signed-off-by: Sven Van Asbroeck <TheSven73@gmail.com>
Link: https://lore.kernel.org/r/20200417221341.31428-1-TheSven73@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/zl38060.yaml

+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/zl38060.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ZL38060 Connected Home Audio Processor from Microsemi.
+
+description: |
+  The ZL38060 is a "Connected Home Audio Processor" from Microsemi,
+  which consists of a Digital Signal Processor (DSP), several Digital
+  Audio Interfaces (DAIs), analog outputs, and a block of 14 GPIOs.
+
+maintainers:
+  - Jaroslav Kysela <perex@perex.cz>
+  - Takashi Iwai <tiwai@suse.com>
+
+properties:
+  compatible:
+    const: mscc,zl38060
+
+  reg:
+    description:
+      SPI device address.
+    maxItems: 1
+
+  spi-max-frequency:
+    maximum: 24000000
+
+  reset-gpios:
+    description:
+      A GPIO line handling reset of the chip. As the line is active low,
+      it should be marked GPIO_ACTIVE_LOW (see ../gpio/gpio.txt)
+    maxItems: 1
+
+  '#gpio-cells':
+    const: 2
+
+  gpio-controller: true
+
+  '#sound-dai-cells':
+    const: 0
+
+required:
+  - compatible
+  - reg
+  - '#gpio-cells'
+  - gpio-controller
+  - '#sound-dai-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    spi0 {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        codec: zl38060@0 {
+            gpio-controller;
+            #gpio-cells = <2>;
+            #sound-dai-cells = <0>;
+            compatible = "mscc,zl38060";
+            reg = <0>;
+            spi-max-frequency = <12000000>;
+            reset-gpios = <&gpio1 0 GPIO_ACTIVE_LOW>;
+        };
+    };