[RFC PATCH 16/16] ASoC: dt-bindings: add document for Hifiberry DAC+ PRO clock

[Pierre-Louis Bossart]

The Hifiberry DAC+ PRO relies on two local audio oscillators exposed
with the clock framework.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
---
 .../bindings/sound/hifiberry-dacpro.yaml      | 38 +++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/sound/hifiberry-dacpro.yaml

diff --git a/Documentation/devicetree/bindings/sound/hifiberry-dacpro.yaml b/Documentation/devicetree/bindings/sound/hifiberry-dacpro.yaml
new file mode 100644
index 000000000000..9305a1a0ccd7
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/hifiberry-dacpro.yaml
@@ -0,0 +1,38 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/hifiberry-dacpro.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Hifiberry DAC+ Pro clock driver
+
+maintainers:
+  - Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
+
+description: |
+  The Hifiberry DAC+ PRO provides two oscillators for enhanced audio
+  quality. The clk driver allow for select and configuration of the
+  clock source.
+
+properties:
+  "#clock-cells":
+    const: 0
+
+  compatible:
+    items:
+      - const: hifiberry,dacpro-clk
+  reg:
+    maxItems: 1
+
+required:
+  - "#clock-cells"
+  - compatible
+
+examples:
+  - |
+    dacpro_osc: dacpro_osc {
+        compatible = "hifiberry,dacpro-clk";
+        #clock-cells = <0>;
+    };
+
+...
-- 
2.20.1