linux-kernel - Re: [PATCH 1/2] dt-bindings: clock: spacemit: Add clock controlers of Spacemit K1 SoC

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Message-ID: <w4alphet2d56ojfpm5ibgxdkleb54uvvfsrw5iktzph7xsg3zj@ybofz6uo7qd4>
Date: Sun, 1 Sep 2024 12:55:21 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Haylen Chu <heylenay@...look.com>
Cc: Michael Turquette <mturquette@...libre.com>, 
	Stephen Boyd <sboyd@...nel.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, linux-clk@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: clock: spacemit: Add clock controlers
 of Spacemit K1 SoC

On Sat, Aug 31, 2024 at 03:47:12PM +0000, Haylen Chu wrote:
> Add definition for the clock controllers of Spacemit K1 SoC. The clock
> tree is managed by several SoC parts, thus different compatible strings
> are added for each.
> 
> Signed-off-by: Haylen Chu <heylenay@...look.com>
> ---

This wasn't ever tested...

>  .../bindings/clock/spacemit,ccu.yaml          | 116 +++++++++++
>  include/dt-bindings/clock/spacemit,ccu.h      | 197 ++++++++++++++++++
>  2 files changed, 313 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/spacemit,ccu.yaml
>  create mode 100644 include/dt-bindings/clock/spacemit,ccu.h
> 
> diff --git a/Documentation/devicetree/bindings/clock/spacemit,ccu.yaml b/Documentation/devicetree/bindings/clock/spacemit,ccu.yaml
> new file mode 100644
> index 000000000000..90ddfc5e2a2f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/spacemit,ccu.yaml
> @@ -0,0 +1,116 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/clock/spacemit,ccu.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Spacemit SoC Clock Controller

What's the SoC name?

> +
> +maintainers:
> +  - Haylen Chu <heylenay@...look.com>
> +
> +properties:
> +  compatible:
> +    enum:
> +      - spacemit,ccu-apbs
> +      - spacemit,ccu-mpmu
> +      - spacemit,ccu-apbc
> +      - spacemit,ccu-apmu
> +
> +  clocks: true

No, this must be specific. min/maxItems

> +
> +  clock-names: true

No, this must be specific. min/maxItems

> +
> +  spacemit,mpmu:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description:
> +      Phandle to the syscon managing "Main PMU (MPMU)" registers

Explain what for.


> +
> +  "#clock-cells":
> +    const: 1
> +    description:
> +      See <dt-bindings/clock/spacemit,ccu.h> for valid indices.
> +
> +required:
> +  - compatible
> +  - "#clock-cells"
> +
> +additionalProperties: false

This goes after allOf block.

> +
> +allOf:
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: spacemit,ccu-apbs
> +    then:
> +      properties:
> +        clocks:
> +          maxItems: 1
> +
> +        clock-names:
> +          const: pll1_2457p6_vco

Don't use some weird, fake names. That's pll or vco or whatever the
input is called.

> +
> +      required:
> +        - compatible
> +        - clocks
> +        - clock-names
> +        - "#clock-cells"
> +        - spacemit,mpmu
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: spacemit,ccu-apbc
> +    then:
> +      properties:
> +        clocks:
> +          maxItems: 4
> +
> +        clock-names:
> +          items:
> +            - const: clk_32k
> +            - const: vctcxo_1
> +            - const: vctcxo_24
> +            - const: vctcxo_3
> +
> +      required:
> +        - compatible
> +        - clocks
> +        - clock-names
> +        - "#clock-cells"
> +
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: spacemit,ccu-apmu
> +    then:
> +      properties:
> +        clocks:
> +          maxItems: 1
> +
> +        clock-names:
> +          const: vctcxo_24
> +
> +      required:
> +        - compatible
> +        - clocks
> +        - clock-names
> +        - "#clock-cells"
> +
> +examples:
> +  - |
> +    syscon_apbs: system-control@...90000 {
> +        compatible = "spacemit,mpmu-syscon", "syscon",
> +        "simple-mfd";

Messed indentation.

Anyway, parent device nodes should have complete example.

> +        reg = <0x0 0xd4090000 0x0 0x1000>;
> +
> +        clk_apbs: clock-controller {
> +            compatible = "spacemit,ccu-apbs";
> +            clocks = <&pll1_2457p6_vco>;
> +            clock-names = "pll1_2457p6_vco";
> +            #clock-cells = <1>;
> +            spacemit,mpmu = <&syscon_mpmu>;
> +        };
> +    };
> diff --git a/include/dt-bindings/clock/spacemit,ccu.h b/include/dt-bindings/clock/spacemit,ccu.h
> new file mode 100644
> index 000000000000..ce84690684ff
> --- /dev/null
> +++ b/include/dt-bindings/clock/spacemit,ccu.h
> @@ -0,0 +1,197 @@
> +/* SPDX-License-Identifier: (GPL-2.0-only OR MIT) */

Use the same license. (one pointed out by checkpatch)

Best regards,
Krzysztof