ASoC: dt-bindings: fsl_xcvr: Add document for XCVR

XCVR (Audio Transceiver) is a new IP module found on i.MX8MP.

Signed-off-by: Viorel Suman <viorel.suman@nxp.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20201013121733.83684-3-viorel.suman@oss.nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/fsl,xcvr.yaml

@@ -0,0 +1,104 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/fsl,xcvr.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NXP Audio Transceiver (XCVR) Controller
+
+maintainers:
+  - Viorel Suman <viorel.suman@nxp.com>
+
+description: |
+  NXP XCVR (Audio Transceiver) is a on-chip functional module
+  that allows CPU to receive and transmit digital audio via
+  HDMI2.1 eARC, HDMI1.4 ARC and SPDIF.
+
+properties:
+  $nodename:
+    pattern: "^xcvr@.*"
+
+  compatible:
+    enum:
+      - fsl,imx8mp-xcvr
+
+  reg:
+    items:
+      - description: 20K RAM for code and data
+      - description: registers space
+      - description: RX FIFO address
+      - description: TX FIFO address
+
+  reg-names:
+    items:
+      - const: ram
+      - const: regs
+      - const: rxfifo
+      - const: txfifo
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: Peripheral clock
+      - description: PHY clock
+      - description: SPBA clock
+      - description: PLL clock
+
+  clock-names:
+    items:
+      - const: ipg
+      - const: phy
+      - const: spba
+      - const: pll_ipg
+
+  dmas:
+    items:
+      - description: DMA controller phandle and request line for RX
+      - description: DMA controller phandle and request line for TX
+
+  dma-names:
+    items:
+      - const: rx
+      - const: tx
+
+  resets:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - reg-names
+  - interrupts
+  - clocks
+  - clock-names
+  - dmas
+  - dma-names
+  - resets
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/clock/imx8mp-clock.h>
+    #include <dt-bindings/reset/imx8mp-reset.h>
+
+    xcvr: xcvr@30cc0000 {
+           compatible = "fsl,imx8mp-xcvr";
+           reg = <0x30cc0000 0x800>,
+                 <0x30cc0800 0x400>,
+                 <0x30cc0c00 0x080>,
+                 <0x30cc0e00 0x080>;
+           reg-names = "ram", "regs", "rxfifo", "txfifo";
+           interrupts = <0x0 128 IRQ_TYPE_LEVEL_HIGH>;
+           clocks = <&audiomix_clk IMX8MP_CLK_AUDIOMIX_EARC_IPG>,
+                    <&audiomix_clk IMX8MP_CLK_AUDIOMIX_EARC_PHY>,
+                    <&audiomix_clk IMX8MP_CLK_AUDIOMIX_SPBA2_ROOT>,
+                    <&audiomix_clk IMX8MP_CLK_AUDIOMIX_AUDPLL_ROOT>;
+           clock-names = "ipg", "phy", "spba", "pll_ipg";
+           dmas = <&sdma2 30 2 0>, <&sdma2 31 2 0>;
+           dma-names = "rx", "tx";
+           resets = <&audiomix_reset 0>;
+    };