[PATCH 1/2] dt-bindings: clock: anlogic,dr1v90-cru: make external clocks optional

[Conor Dooley]

On Fri, Oct 02, 2026 at 02:07:00PM +0800, Junhui Liu wrote:
> The external CAN and WDT clocks are optional inputs routed from the
> board; the main oscillator is the only required clock. The binding
> currently requires all three clocks, which forces device trees to add
> stub fixed-clock nodes without a clock-frequency to satisfy it.
> 
> Allow the clocks and clock-names properties to contain just "osc",
> optionally followed by either or both of "can_ext" and "wdt_ext".
> 
> Fixes: 155d900e4c7d ("dt-bindings: clock: add Anlogic DR1V90 CRU")
> Signed-off-by: Junhui Liu <junhui.liu at pigmoral.tech>
> ---
>  .../bindings/clock/anlogic,dr1v90-cru.yaml         | 24 +++++++++++++++-------
>  1 file changed, 17 insertions(+), 7 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/clock/anlogic,dr1v90-cru.yaml b/Documentation/devicetree/bindings/clock/anlogic,dr1v90-cru.yaml
> index 11a92588e494..8bd7b78a58d8 100644
> --- a/Documentation/devicetree/bindings/clock/anlogic,dr1v90-cru.yaml
> +++ b/Documentation/devicetree/bindings/clock/anlogic,dr1v90-cru.yaml
> @@ -17,16 +17,26 @@ properties:
>      maxItems: 1
>  
>    clocks:
> -    items:
> -      - description: Main oscillator
> -      - description: External CAN clock
> -      - description: External WDT clock
> +    minItems: 1
> +    maxItems: 3
> +    description:
> +      The main oscillator is always required. An external CAN clock and an
> +      external WDT clock may additionally be provided if the board routes these
> +      clocks to the SoC.
>  
>    clock-names:
> -    items:
> +    oneOf:
>        - const: osc
> -      - const: can_ext
> -      - const: wdt_ext
> +      - items:
> +          - const: osc
> +          - const: can_ext
> +      - items:
> +          - const: osc
> +          - const: wdt_ext
> +      - items:
> +          - const: osc
> +          - const: can_ext
> +          - const: wdt_ext

This need not be so complicated. The following should do the trick:

clock-names:
  minItems: 1
  items:
    - const: osc
    - enum: [can_ext, wdt_ext]
    - const: wdt_ext

pwbot: changes-requested

>  
>    "#clock-cells":
>      const: 1
> 
> -- 
> 2.55.0
> 
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