linux-kernel - Re: [PATCH 07/15] dt-bindings: clock: Add Ambarella clock bindings

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Date:   Mon, 23 Jan 2023 09:11:08 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Li Chen <lchen@...arella.com>, Li Chen <me@...ux.beauty>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     "moderated list:ARM/Ambarella SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:COMMON CLK FRAMEWORK" <linux-clk@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 07/15] dt-bindings: clock: Add Ambarella clock bindings

On 23/01/2023 08:32, Li Chen wrote:
> This patch introduce clock bindings for Ambarella.
> 
> Signed-off-by: Li Chen <lchen@...arella.com>
> Change-Id: I29018a23ed3a5b79a1103e859a5c7ed7bb83a261

All the same problems plus new:

Subject: drop second/last, redundant "bindings". The "dt-bindings"
prefix is already stating that these are bindings.

> ---
>  .../clock/ambarella,composite-clock.yaml      | 52 ++++++++++++++++
>  .../bindings/clock/ambarella,pll-clock.yaml   | 59 +++++++++++++++++++
>  MAINTAINERS                                   |  2 +
>  3 files changed, 113 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/ambarella,composite-clock.yaml
>  create mode 100644 Documentation/devicetree/bindings/clock/ambarella,pll-clock.yaml
> 
> diff --git a/Documentation/devicetree/bindings/clock/ambarella,composite-clock.yaml b/Documentation/devicetree/bindings/clock/ambarella,composite-clock.yaml
> new file mode 100644
> index 000000000000..fac1cb9379c4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/ambarella,composite-clock.yaml
> @@ -0,0 +1,52 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/clock/ambarella,composite-clock.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Ambarella Composite Clock
> +
> +maintainers:
> +  - Li Chen <lchen@...arella.com>
> +

Missing description.

> +properties:
> +  compatible:
> +    items:

Drop items.

> +      - const: ambarella,composite-clock

Missing SoC specific compatible. This is anyway not really correct
compatible...

> +
> +  clocks: true

No, needs constraints.

> +  assigned-clocks: true
> +  assigned-clock-parents: true
> +  assigned-clock-rates: true

Drop these three.

> +  clock-output-names: true

Missing constraints.

> +  amb,mux-regmap: true

NAK.

It's enough. The patches have very, very poor quality.

Missing description, missing type/$ref, wrong prefix.

> +  amb,div-regmap: true
> +  amb,div-width: true
> +  amb,div-shift: true

These two are arguments to phandle.

> +
> +  '#clock-cells':
> +    const: 0
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - '#clock-cells'
> +
> +additionalProperties: false

So why you decided to add it here and not in other places?
> +
> +examples:
> +  - |
> +      gclk_uart0: gclk-uart0 {

Wrong indentation.

> +        #clock-cells = <0>;
> +        compatible = "ambarella,composite-clock";
> +        clocks = <&osc>, <&gclk_core>, <&pll_out_enet>, <&pll_out_sd>;
> +        clock-output-names = "gclk_uart0";
> +        assigned-clocks = <&gclk_uart0>;
> +        assigned-clock-parents = <&osc>;
> +        assigned-clock-rates = <24000000>;
> +        amb,mux-regmap = <&rct_syscon 0x1c8>;
> +        amb,div-regmap = <&rct_syscon 0x038>;
> +        amb,div-width = <24>;
> +        amb,div-shift = <0>;
> +      };
> diff --git a/Documentation/devicetree/bindings/clock/ambarella,pll-clock.yaml b/Documentation/devicetree/bindings/clock/ambarella,pll-clock.yaml
> new file mode 100644
> index 000000000000..65c1feb60041
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/ambarella,pll-clock.yaml
> @@ -0,0 +1,59 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/clock/ambarella,pll-clock.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Ambarella PLL Clock
> +
> +maintainers:
> +  - Li Chen <lchen@...arella.com>
> +
> +properties:
> +  compatible:
> +    enum:
> +      - ambarella,pll-clock
> +      - ambarella,clkpll-v0
> +
> +if:

No, this does not work like that. It sits under "allOf", located after
"required:".

> +  properties:
> +    compatible:
> +      const: ambarella,pll-clock
> +
> +then:
> +  properties:
> +    clocks:
> +      maxItems: 1
> +
> +    clock-output-names: true
> +    amb,clk-regmap: true
> +    amb,frac-mode: true
> +    assigned-clocks: true
> +    assigned-clock-rates: true

Same problems.

> +    gclk_axi: gclk-axi {
> +        #clock-cells = <0>;
> +        compatible = "fixed-factor-clock";

What is this example about? Not related at all. Provide real example.



Best regards,
Krzysztof