Re: [PATCH 02/16] dt-bindings: clock: Add ARTPEC-8 CMU bindings

[Krzysztof Kozlowski <krzk@kernel.org>]

On 10/07/2025 02:20, ksk4725@coasia.com wrote:
> From: Hakyeong Kim <hgkim05@coasia.com>
> 
> Add dt-schema for ARTPEC-8 SoC clock controller.
> 
> Add device-tree binding definitions for following CMU blocks:
> - CMU_CMU
> - CMU_BUS
> - CMU_CORE
> - CMU_CPUCL
> - CMU_FSYS
> - CMU_IMEM
> - CMU_PERI
> 
> Signed-off-by: Ravi Patel <ravi.patel@samsung.com>
> Signed-off-by: Hakyeong Kim <hgkim05@coasia.com>

Confusing order, unless you really understand this, but considering you
did not add your own SoB I claim you do not understand this. What does
Ravi's SoB mean here?

> ---
>  .../bindings/clock/axis,artpec8-clock.yaml    | 224 ++++++++++++++++++
>  1 file changed, 224 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/axis,artpec8-clock.yaml
> 
> diff --git a/Documentation/devicetree/bindings/clock/axis,artpec8-clock.yaml b/Documentation/devicetree/bindings/clock/axis,artpec8-clock.yaml
> new file mode 100644
> index 000000000000..baacea10599b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/axis,artpec8-clock.yaml
> @@ -0,0 +1,224 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/clock/axis,artpec8-clock.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Axis ARTPEC-8 SoC clock controller
> +
> +maintainers:
> +  - Jesper Nilsson <jesper.nilsson@axis.com>
> +
> +description: |
> +  ARTPEC-8 clock controller is comprised of several CMU units, generating
> +  clocks for different domains. Those CMU units are modeled as separate device
> +  tree nodes, and might depend on each other. The root clock in that root tree
> +  is an external clock: OSCCLK (25 MHz). This external clock must be defined
> +  as a fixed-rate clock in dts.
> +
> +  CMU_CMU is a top-level CMU, where all base clocks are prepared using PLLs and
> +  dividers; all other clocks of function blocks (other CMUs) are usually
> +  derived from CMU_CMU.
> +
> +  Each clock is assigned an identifier and client nodes can use this identifier
> +  to specify the clock which they consume. All clocks available for usage
> +  in clock consumer nodes are defined as preprocessor macros in
> +  'include/dt-bindings/clock/axis,artpec8-clk.h' header.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - axis,artpec8-cmu-cmu
> +      - axis,artpec8-cmu-bus
> +      - axis,artpec8-cmu-core
> +      - axis,artpec8-cmu-cpucl
> +      - axis,artpec8-cmu-fsys
> +      - axis,artpec8-cmu-imem
> +      - axis,artpec8-cmu-peri
> +
> +  clocks:
> +    minItems: 1
> +    maxItems: 5
> +
> +  clock-names:
> +    minItems: 1
> +    maxItems: 5
> +
> +  "#clock-cells":
> +    const: 1
> +
> +  reg:
> +    maxItems: 1

reg goes second, after compatible (Samsung bindings are not the best
example because I converted them long time ago before many coding style
practices were encouraged)

> +
> +required:
> +  - compatible
> +  - reg
> +  - "#clock-cells"
> +  - clocks
> +  - clock-names
> +
> +allOf:
> +  - if:
> +      properties:
> +        compatible:
> +          contains:

Drop contains.

> +            const: axis,artpec8-cmu-cmu
> +
> +    then:
> +      properties:
> +        clocks:
> +          items:
> +            - description: External reference clock (25 MHz)
> +
> +        clock-names:
> +          items:
> +            - const: fin_pll
> +
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: axis,artpec8-cmu-bus
> +
> +    then:
> +      properties:
> +        clocks:
> +          items:
> +            - description: External reference clock (25 MHz)
> +            - description: CMU_BUS BUS clock (from CMU_CMU)
> +            - description: CMU_BUS DLP clock (from CMU_CMU)
> +
> +        clock-names:
> +          items:
> +            - const: fin_pll
> +            - const: dout_clkcmu_bus_bus
> +            - const: dout_clkcmu_bus_dlp

All these names should be changed to match what is the input. Look at
latest bindings, we moved away from that style.



Best regards,
Krzysztof