dt-bindings: clocks: add binding for gated-fixed-clocks

A patch from »Binding and driver for gated-fixed-clocks« in state Mainline for linux-kernel

From: Heiko Stuebner <heiko@...> Date: Sun, 7 Jul 2024 13:35:08 +0200

Commit-Message

In contrast to fixed clocks that are described as ungateable, boards sometimes use additional oscillators 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 oscillators that are not configurable themself, but need to handle supplies for them to work. In schematics they often can be seen as ---------------- Enable - | 100MHz,3.3V, | - VDD | 3225 | GND - | | - OUT ---------------- or similar. The enable pin might be separate but can also just be tied to the vdd supply, hence it is optional in the binding. Signed-off-by: Heiko Stuebner <heiko@...> Reviewed-by: Rob Herring (Arm) <robh@...> Reviewed-by: Conor Dooley <conor.dooley@...>

Patch-Comment

.../bindings/clock/gated-fixed-clock.yaml | 49 +++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 Documentation/devicetree/bindings/clock/gated-fixed-clock.yaml

Statistics

  • 49 lines added
  • 0 lines removed

Changes

-------- Documentation/devicetree/bindings/clock/gated-fixed-clock.yaml --------
new file mode 100644
index 000000000000..d3e0faf3c64d
@@ -0,0 +1,49 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/gated-fixed-clock.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Gated Fixed clock
+
+maintainers:
+ - Heiko Stuebner <heiko@sntech.de>
+
+properties:
+ compatible:
+ const: gated-fixed-clock
+
+ "#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 oscillator.
+ maxItems: 1
+
+ vdd-supply:
+ description: handle of the regulator that provides the supply voltage
+
+required:
+ - compatible
+ - "#clock-cells"
+ - clock-frequency
+ - vdd-supply
+
+additionalProperties: false
+
+examples:
+ - |
+ clock-1000000000 {
+ compatible = "gated-fixed-clock";
+ #clock-cells = <0>;
+ clock-frequency = <1000000000>;
+ vdd-supply = <&reg_vdd>;
+ };
+...
 
 

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