[PATCH 1/6] dt-bindings: clocks: add binding for generic clock-generators

[Heiko Stuebner <heiko@sntech.de>]

In contrast to fixed clocks that are described as ungateable, boards
sometimes use additional clock generators for things like PCIe reference
clocks, that need actual supplies to get enabled and enable-gpios to be
toggled for them to work.

This adds a binding for such clock generators that are not configurable
themself, but need to handle supplies for them to work.

While in a lot of cases the type of the IC used is described in board
schematics, in some cases just a generic type description like
"100MHz, 3.3V" might also be used. The binding therefore allows both
cases. Specifying the type is of course preferred.

The clock-frequency is set in devicetree, because while some clock
generators have pins to decide between multipls output rates, those
are generally set statically on the board-layout-level.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
---
 .../bindings/clock/clock-generator.yaml       | 62 +++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/clock-generator.yaml

diff --git a/Documentation/devicetree/bindings/clock/clock-generator.yaml b/Documentation/devicetree/bindings/clock/clock-generator.yaml
new file mode 100644
index 0000000000000..f44e61e414e89
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/clock-generator.yaml
@@ -0,0 +1,62 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/clock-generator.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Simple clock generators
+
+maintainers:
+  - Heiko Stuebner <heiko@sntech.de>
+
+properties:
+  $nodename:
+    anyOf:
+      - description:
+          Preferred name is 'clock-<freq>' with <freq> being the output
+          frequency as defined in the 'clock-frequency' property.
+        pattern: "^clock-([0-9]+|[a-z0-9-]+)$"
+      - description: Any name allowed
+        deprecated: true
+
+  compatible:
+    oneOf:
+      - const: clock-generator
+      - items:
+          - enum:
+              - diodes,pi6c557-03b
+              - diodes,pi6c557-05b
+          - const: clock-generator
+
+  "#clock-cells":
+    const: 0
+
+  clock-frequency: true
+
+  clock-output-names:
+    maxItems: 1
+
+  enable-gpios:
+    description:
+      Contains a single GPIO specifier for the GPIO that enables and disables
+      the clock generator.
+    maxItems: 1
+
+  vdd-supply:
+    description: handle of the regulator that provides the supply voltage
+
+required:
+  - compatible
+  - "#clock-cells"
+  - clock-frequency
+
+additionalProperties: false
+
+examples:
+  - |
+    clock {
+      compatible = "clock-generator";
+      #clock-cells = <0>;
+      clock-frequency = <1000000000>;
+    };
+...
-- 
2.39.2