[PATCH v4 2/6] dt: bindings: add mt7621-clk device tree binding documentation

[Sergio Paracuellos <sergio.paracuellos@gmail.com>]

Adds device tree binding documentation for clocks in the
MT7621 SOC.

Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
---
 .../bindings/clock/mediatek,mt7621-clk.yaml   | 67 +++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/mediatek,mt7621-clk.yaml

diff --git a/Documentation/devicetree/bindings/clock/mediatek,mt7621-clk.yaml b/Documentation/devicetree/bindings/clock/mediatek,mt7621-clk.yaml
new file mode 100644
index 000000000000..6aca4c1a4a46
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/mediatek,mt7621-clk.yaml
@@ -0,0 +1,67 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/mediatek,mt7621-clk.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MT7621 Clock Device Tree Bindings
+
+maintainers:
+  - Sergio Paracuellos <sergio.paracuellos@gmail.com>
+
+description: |
+  The MT7621 has a PLL controller from where the cpu clock is provided
+  as well as derived clocks for the bus and the peripherals. It also
+  can gate SoC device clocks.
+
+  Each clock is assigned an identifier and client nodes use this identifier
+  to specify the clock which they consume.
+
+  All these identifiers could be found in:
+  [1]: <include/dt-bindings/clock/mt7621-clk.h>.
+
+  The mt7621 clock node should be the child of a syscon node with the
+  required property:
+
+  - compatible: Should be one of the following:
+                "mediatek,mt7621-sysc", "syscon"
+
+  Refer to the bindings described in
+  Documentation/devicetree/bindings/mfd/syscon.yaml
+
+properties:
+  compatible:
+    const: mediatek,mt7621-clk
+
+  "#clock-cells":
+    description:
+      The first cell indicates the clock gate number, see [1] for available
+      clocks.
+    const: 1
+
+  clock-output-names:
+    maxItems: 8
+
+required:
+  - compatible
+  - '#clock-cells'
+  - clock-output-names
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/mt7621-clk.h>
+
+    sysc: sysc@0 {
+      compatible = "mediatek,mt7621-sysc", "syscon";
+      reg = <0x0 0x100>;
+
+      pll {
+        compatible = "mediatek,mt7621-clk";
+        #clock-cells = <1>;
+        clock-output-names = "xtal", "cpu", "bus",
+                             "50m", "125m", "150m",
+                             "250m", "270m";
+      };
+    };
-- 
2.25.1