linux-kernel - Re: [PATCH v2 2/8] dt-bindings: counter: Add new ti,am62-eqep compatible

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Date: Fri, 24 May 2024 15:50:32 -0500
From: David Lechner <david@...hnology.com>
To: Judith Mendez <jm@...com>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Catalin Marinas
 <catalin.marinas@....com>, Will Deacon <will@...nel.org>,
 William Breathitt Gray <william.gray@...aro.org>
Cc: linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
 Nishanth Menon <nm@...com>, Vignesh Raghavendra <vigneshr@...com>
Subject: Re: [PATCH v2 2/8] dt-bindings: counter: Add new ti,am62-eqep
 compatible

On 5/23/24 6:15 PM, Judith Mendez wrote:
> Add new compatible ti,am62-eqep for TI K3 devices. If a device
> uses this compatible, require power-domains property.
> 
> Since there is only one functional and interface clock for eqep,
> clock-names is not really required. The clock-name also changed
> for TI K3 SoCs so make clock-names optional for the new compatible
> since there is only one clock that is routed to the IP.
> 
> While we are here, add an example using ti,am62-eqep compatible.
> 
> Signed-off-by: Judith Mendez <jm@...com>
> ---
> Changes since v1:
> - Fix eqep binding for new compatible, require
>  power-domains for new compatible
> ---
>  .../devicetree/bindings/counter/ti-eqep.yaml  | 53 +++++++++++++++++--
>  1 file changed, 48 insertions(+), 5 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/counter/ti-eqep.yaml b/Documentation/devicetree/bindings/counter/ti-eqep.yaml
> index 85f1ff83afe72..c4bb0231f166a 100644
> --- a/Documentation/devicetree/bindings/counter/ti-eqep.yaml
> +++ b/Documentation/devicetree/bindings/counter/ti-eqep.yaml
> @@ -11,7 +11,9 @@ maintainers:
>  
>  properties:
>    compatible:
> -    const: ti,am3352-eqep
> +    enum:
> +      - ti,am3352-eqep
> +      - ti,am62-eqep
>  
>    reg:
>      maxItems: 1
> @@ -21,19 +23,43 @@ properties:
>      maxItems: 1
>  
>    clocks:
> -    description: The clock that determines the SYSCLKOUT rate for the eQEP
> -      peripheral.
> +    description: The functional and interface clock that determines the clock
> +      rate for the eQEP peripheral.
>      maxItems: 1
>  
>    clock-names:
> -    const: sysclkout
> +    enum:
> +      - sysclkout
> +      - fck
> +

If we are making this optional for ti,am62-eqep, why add a new name?

Also, we could change the description to say that sysclockout is not a
great name but is required for backwards compatibility.

> +  power-domains:
> +    maxItems: 1
> +
> +allOf:
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - ti,am3352-eqep
> +    then:
> +      required:
> +        - clock-names

What if we just add

  else:
    clock-names: false

since there is only one clock and not worry about the name?

> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - ti,am62-eqep
> +    then:
> +      required:
> +        - power-domains
>  
>  required:
>    - compatible
>    - reg
>    - interrupts
>    - clocks
> -  - clock-names
>