WIP: device tree MVP

dts/bindings/audio/intel,dmic.yaml

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+# Copyright (c) 2020 Intel Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+description: Intel Digital PDM Microphone (DMIC) node
+
+compatible: "intel,dmic"
+
+include: base.yaml
+
+properties:
+    label:
+      required: true

dts/bindings/audio/nordic,nrf-pdm.yaml

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+# Copyright (c) 2019 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+
+description: Nordic PDM (Pulse Density Modulation interface)
+
+compatible: "nordic,nrf-pdm"
+
+include: base.yaml
+
+properties:
+    reg:
+      required: true
+
+    interrupts:
+      required: true
+
+    clk-pin:
+      type: int
+      required: true
+      description: CLK pin
+
+    din-pin:
+      type: int
+      required: true
+      description: DIN pin
+
+    clock-source:
+      type: string
+      required: false
+      default: "PCLK32M_HFXO"
+      description: |
+        Clock source to be used by the PDM peripheral. The following options
+        are available:
+        - "PCLK32M": 32 MHz peripheral clock, synchronous to HFCLK
+        - "PCLK32M_HFXO": PCLK32M running off the 32 MHz crystal oscillator
+          (HFXO) for better clock accuracy and jitter performance
+        - "ACLK": Audio PLL clock with configurable frequency (frequency for
+          this clock must be set via the "hfclkaudio-frequency" property
+          in the "nordic,nrf-clock" node); this clock source is only available
+          in the nRF53 Series SoCs and it requires the use of HFXO
+      enum:
+        - "PCLK32M"
+        - "PCLK32M_HFXO"
+        - "ACLK"
+
+    queue-size:
+      type: int
+      required: false
+      default: 4
+      description: |
+        Size of the queue of received audio data blocks to be used
+        by the driver.

dts/bindings/audio/st,mpxxdtyy-i2s.yaml

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+# Copyright (c) 2018 STMicroelectronics
+# SPDX-License-Identifier: Apache-2.0
+
+description: STMicroelectronics MPXXDTYY digital PDM microphone family
+
+compatible: "st,mpxxdtyy"
+
+include: i2s-device.yaml
+
+properties:
+    label:
+      required: true

dts/bindings/audio/ti,tlv320dac.yaml

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+# Copyright (c) 2018, Intel Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+description: Texas Instruments TLV320DAC310x Audio DAC
+
+compatible: "ti,tlv320dac"
+
+include: i2c-device.yaml
+
+properties:
+    reset-gpios:
+      type: phandle-array
+      required: true