linux-kernel - Re: [PATCH v3 04/15] dt-bindings: clk: sunxi-ng: document Allwinner A523 CCU

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Message-ID: <20250304141125.GA2518548-robh@kernel.org>
Date: Tue, 4 Mar 2025 08:11:25 -0600
From: Rob Herring <robh@...nel.org>
To: Andre Przywara <andre.przywara@....com>
Cc: Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Samuel Holland <samuel@...lland.org>,
	Philipp Zabel <p.zabel@...gutronix.de>, linux-clk@...r.kernel.org,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 04/15] dt-bindings: clk: sunxi-ng: document Allwinner
 A523 CCU

On Tue, Mar 04, 2025 at 01:27:54AM +0000, Andre Przywara wrote:
> The Allwinner A523/T527 SoCs have four CCUs, this adds the binding for
> the main CCU.
> 
> The source clock list differs in some annoying details, and folding this
> into the existing Allwinner CCU clock binding document gets quite
> unwieldy, so create a new document for these CCUs.
> Add the new compatible string, along with the required input clock
> lists. This conditionally describes the input clock list, to make for
> an easier patch adding the other CCUs.
> 
> Also add the DT binding headers, listing all the clocks with their ID
> numbers.
> 
> Signed-off-by: Andre Przywara <andre.przywara@....com>
> ---
>  .../clock/allwinner,sun55i-a523-ccu.yaml      |  77 +++++++
>  include/dt-bindings/clock/sun55i-a523-ccu.h   | 189 ++++++++++++++++++
>  include/dt-bindings/reset/sun55i-a523-ccu.h   |  88 ++++++++
>  3 files changed, 354 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/allwinner,sun55i-a523-ccu.yaml
>  create mode 100644 include/dt-bindings/clock/sun55i-a523-ccu.h
>  create mode 100644 include/dt-bindings/reset/sun55i-a523-ccu.h
> 
> diff --git a/Documentation/devicetree/bindings/clock/allwinner,sun55i-a523-ccu.yaml b/Documentation/devicetree/bindings/clock/allwinner,sun55i-a523-ccu.yaml
> new file mode 100644
> index 0000000000000..2eacaeaeabac7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/allwinner,sun55i-a523-ccu.yaml
> @@ -0,0 +1,77 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/clock/allwinner,sun55i-a523-ccu.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Allwinner A523 Clock Control Unit
> +
> +maintainers:
> +  - Andre Przywara <andre.przywara@....com>
> +
> +properties:
> +  "#clock-cells":
> +    const: 1
> +
> +  "#reset-cells":
> +    const: 1
> +
> +  compatible:
> +    enum:
> +      - allwinner,sun55i-a523-ccu
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    minItems: 4
> +    maxItems: 4
> +
> +  clock-names:
> +    minItems: 4
> +    maxItems: 4
> +
> +required:
> +  - "#clock-cells"
> +  - "#reset-cells"
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +
> +if:

Put this under an allOf and use another 'if' instead of the 'else' 
clause in the 2nd patch.

> +  properties:
> +    compatible:
> +      enum:
> +        - allwinner,sun55i-a523-ccu
> +
> +then:
> +  properties:
> +    clocks:
> +      items:
> +        - description: High Frequency Oscillator (usually at 24MHz)
> +        - description: Low Frequency Oscillator (usually at 32kHz)
> +        - description: Internal Oscillator
> +        - description: Low Frequency Oscillator fanout
> +
> +    clock-names:
> +      items:
> +        - const: hosc
> +        - const: losc
> +        - const: iosc
> +        - const: losc-fanout
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    ccu: clock@...1000 {

Drop ccu and it's 'clock-controller' not 'clock'.

> +        compatible = "allwinner,sun55i-a523-ccu";
> +        reg = <0x2001000 0x1000>;
> +        clocks = <&osc24M>, <&osc32k>, <&iosc>, <&r_ccu 2>;
> +        clock-names = "hosc", "losc", "iosc", "losc-fanout";
> +        #clock-cells = <1>;
> +        #reset-cells = <1>;
> +    };
> +
> +...