linux-kernel - [PATCH v2 1/3] dt-bindings: clocks: add binding for voltage-controlled-oscillators

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Message-Id: <20240715110251.261844-2-heiko@sntech.de>
Date: Mon, 15 Jul 2024 13:02:49 +0200
From: Heiko Stuebner <heiko@...ech.de>
To: mturquette@...libre.com,
	sboyd@...nel.org
Cc: robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	heiko@...ech.de,
	linux-clk@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org
Subject: [PATCH v2 1/3] dt-bindings: clocks: add binding for voltage-controlled-oscillators

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@...ech.de>
---
 .../bindings/clock/voltage-oscillator.yaml    | 49 +++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/voltage-oscillator.yaml

diff --git a/Documentation/devicetree/bindings/clock/voltage-oscillator.yaml b/Documentation/devicetree/bindings/clock/voltage-oscillator.yaml
new file mode 100644
index 0000000000000..8bff6b0fd582e
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/voltage-oscillator.yaml
@@ -0,0 +1,49 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/voltage-oscillator.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Voltage controlled oscillator
+
+maintainers:
+  - Heiko Stuebner <heiko@...ech.de>
+
+properties:
+  compatible:
+    const: voltage-oscillator
+
+  "#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:
+  - |
+    voltage-oscillator {
+      compatible = "voltage-oscillator";
+      #clock-cells = <0>;
+      clock-frequency = <1000000000>;
+      vdd-supply = <&reg_vdd>;
+    };
+...
-- 
2.39.2