linux-kernel - Re: [PATCH v3 1/5] dt-bindings: clocks: add binding for gated-fixed-clocks

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Message-ID: <20240828133733.GA3650798-robh@kernel.org>
Date: Wed, 28 Aug 2024 08:37:33 -0500
From: Rob Herring <robh@...nel.org>
To: Heiko Stuebner <heiko@...ech.de>
Cc: mturquette@...libre.com, sboyd@...nel.org, krzk+dt@...nel.org,
	conor+dt@...nel.org, 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: Re: [PATCH v3 1/5] dt-bindings: clocks: add binding for
 gated-fixed-clocks

On Wed, Aug 28, 2024 at 12:14:59PM +0200, Heiko Stuebner wrote:
> 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/gated-fixed-clock.yaml     | 49 +++++++++++++++++++
>  1 file changed, 49 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/gated-fixed-clock.yaml
> 
> diff --git a/Documentation/devicetree/bindings/clock/gated-fixed-clock.yaml b/Documentation/devicetree/bindings/clock/gated-fixed-clock.yaml
> new file mode 100644
> index 000000000000..76d264770d35
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/gated-fixed-clock.yaml
> @@ -0,0 +1,49 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/clock/gated-fixed-clock.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Gated Fixed clock
> +
> +maintainers:
> +  - Heiko Stuebner <heiko@...ech.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:
> +  - |
> +    voltage-oscillator {

clock-1000000000

Reviewed-by: Rob Herring (Arm) <robh@...nel.org>


> +      compatible = "gated-fixed-clock";
> +      #clock-cells = <0>;
> +      clock-frequency = <1000000000>;
> +      vdd-supply = <&reg_vdd>;
> +    };
> +...
> -- 
> 2.43.0
>