Re: [PATCH 2/5] dt-bindings: clocks: atmel,at91rm9200-pmc: convert to yaml

[Krzysztof Kozlowski]

On 04/05/2023 08:07, Claudiu Beznea wrote:
> Convert Atmel PMC documentation to yaml.
> 
> Signed-off-by: Claudiu Beznea <claudiu.beznea@xxxxxxxxxxxxx>

Thank you for your patch. There is something to discuss/improve.


> diff --git a/Documentation/devicetree/bindings/clock/atmel,at91rm9200-pmc.yaml b/Documentation/devicetree/bindings/clock/atmel,at91rm9200-pmc.yaml
> new file mode 100644
> index 000000000000..c4023c3a85f2
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/atmel,at91rm9200-pmc.yaml
> @@ -0,0 +1,161 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: "http://devicetree.org/schemas/clock/atmel,at91rm9200-pmc.yaml#";
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#";

Drop quotes from both.

> +
> +title: Atmel Power Management Controller (PMC)
> +
> +maintainers:
> +  - Claudiu Beznea <claudiu.beznea@xxxxxxxxxxxxx>
> +
> +description:
> +  The power management controller optimizes power consumption by controlling all
> +  system and user peripheral clocks. The PMC enables/disables the clock inputs
> +  to many of the peripherals and to the processor.
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - items:
> +          - const: atmel,at91sam9260-pmc

Why this is separate, not part of bottom enum?

> +          - const: syscon

> +      - items:
> +          - enum:
> +              - atmel,at91sam9g20-pmc
> +          - enum:
> +              - atmel,at91sam9260-pmc

This should be const. You cannot have here different compatibles.

> +          - const: syscon
> +      - items:
> +          - enum:
> +              - atmel,at91sam9g15-pmc
> +              - atmel,at91sam9g25-pmc
> +              - atmel,at91sam9g35-pmc
> +              - atmel,at91sam9x25-pmc
> +              - atmel,at91sam9x35-pmc
> +          - enum:
> +              - atmel,at91sam9x5-pmc
> +          - const: syscon
> +      - items:
> +          - enum:
> +              - atmel,at91sam9g45-pmc
> +              - atmel,at91sam9n12-pmc
> +              - atmel,at91sam9rl-pmc
> +              - atmel,at91rm9200-pmc

Order by name?

> +              - atmel,sama5d4-pmc
> +              - atmel,sama5d3-pmc
> +              - atmel,sama5d2-pmc
> +              - microchip,sam9x60-pmc
> +              - microchip,sama7g5-pmc
> +          - const: syscon
> +
> +  reg:
> +    maxItems: 1
> +
> +  "#clock-cells":
> +    const: 2

Explain what the cells are for in description. Having '2' for clock
controller is not obvious.

> +
> +  clocks:
> +    minItems: 2
> +    maxItems: 3
> +
> +  clock-names:
> +    minItems: 2
> +    maxItems: 3
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  atmel,osc-bypass:
> +    type: boolean
> +    description: set when a clock signal is directly provided on XIN
> +
> +

Just one blank line.

> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - "#clock-cells"
> +  - clocks
> +  - clock-names

Keep the same order here as they appear in properties:.


> +
> +allOf:
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - microchip,sam9x60-pmc
> +              - microchip,sama7g5-pmc
> +    then:
> +      properties:
> +        clocks:
> +          minItems: 3
> +          maxItems: 3
> +        clock-names:
> +          items:
> +            - const: td_slck
> +            - const: md_slck
> +            - const: main_xtal
> +      required:
> +        - clock-names
> +        - clocks

Drop required: here. It's already in top-level. Same in places below.

> +
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - atmel,at91rm9200-pmc
> +              - atmel,at91sam9260-pmc
> +              - atmel,at91sam9g20-pmc
> +    then:
> +      properties:
> +        clocks:
> +          minItems: 2
> +          maxItems: 2
> +        clock-names:
> +          items:
> +            - const: slow_xtal
> +            - const: main_xtal
> +      required:
> +        - clock-names
> +        - clocks
> +
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - atmel,sama5d4-pmc
> +              - atmel,sama5d3-pmc
> +              - atmel,sama5d2-pmc
> +    then:
> +      properties:
> +        clocks:
> +          minItems: 2
> +          maxItems: 2
> +        clock-names:
> +          items:
> +            - const: slow_clk
> +            - const: main_xtal
> +      required:
> +        - clock-names
> +        - clocks
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +
> +    pmc: clock-controller@f0018000 {
> +        compatible = "atmel,sama5d4-pmc", "syscon";
> +        reg = <0xf0018000 0x120>;
> +        interrupts = <1 IRQ_TYPE_LEVEL_HIGH 7>;

interrupt looks a bit odd. Are you sure it is correct?

> +        #clock-cells = <2>;
> +        clocks = <&clk32k>, <&main_xtal>;
> +        clock-names = "slow_clk", "main_xtal";
> +    };
> +
> +...

Best regards,
Krzysztof