linux-kernel - Re: [PATCH v3 1/3] dt-bindings: timer: atmel,at91sam9260-pit: convert to yaml

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Date:   Wed, 31 May 2023 10:55:50 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Claudiu Beznea <claudiu.beznea@...rochip.com>, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        nicolas.ferre@...rochip.com, alexandre.belloni@...tlin.com,
        daniel.lezcano@...aro.org, tglx@...utronix.de,
        wim@...ux-watchdog.org, linux@...ck-us.net
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-watchdog@...r.kernel.org
Subject: Re: [PATCH v3 1/3] dt-bindings: timer: atmel,at91sam9260-pit: convert
 to yaml

On 30/05/2023 11:07, Claudiu Beznea wrote:
> Convert Microchip AT91 PIT bindings to YAML. Along with it clocks and
> clock-names bindings were added as the drivers needs it to ensure proper
> hardware functionality.
> 
> Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
> ---
>  .../devicetree/bindings/arm/atmel-sysregs.txt | 12 ---
>  .../bindings/timer/atmel,at91sam9260-pit.yaml | 99 +++++++++++++++++++
>  2 files changed, 99 insertions(+), 12 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/timer/atmel,at91sam9260-pit.yaml
> 
> diff --git a/Documentation/devicetree/bindings/arm/atmel-sysregs.txt b/Documentation/devicetree/bindings/arm/atmel-sysregs.txt
> index 67a66bf74895..54d3f586403e 100644
> --- a/Documentation/devicetree/bindings/arm/atmel-sysregs.txt
> +++ b/Documentation/devicetree/bindings/arm/atmel-sysregs.txt
> @@ -4,18 +4,6 @@ Chipid required properties:
>  - compatible: Should be "atmel,sama5d2-chipid" or "microchip,sama7g5-chipid"
>  - reg : Should contain registers location and length
>  
> -PIT Timer required properties:
> -- compatible: Should be "atmel,at91sam9260-pit"
> -- reg: Should contain registers location and length
> -- interrupts: Should contain interrupt for the PIT which is the IRQ line
> -  shared across all System Controller members.
> -
> -PIT64B Timer required properties:
> -- compatible: Should be "microchip,sam9x60-pit64b"
> -- reg: Should contain registers location and length
> -- interrupts: Should contain interrupt for PIT64B timer
> -- clocks: Should contain the available clock sources for PIT64B timer.
> -
>  System Timer (ST) required properties:
>  - compatible: Should be "atmel,at91rm9200-st", "syscon", "simple-mfd"
>  - reg: Should contain registers location and length
> diff --git a/Documentation/devicetree/bindings/timer/atmel,at91sam9260-pit.yaml b/Documentation/devicetree/bindings/timer/atmel,at91sam9260-pit.yaml
> new file mode 100644
> index 000000000000..d0f3f80db4cb
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/timer/atmel,at91sam9260-pit.yaml
> @@ -0,0 +1,99 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/timer/atmel,at91sam9260-pit.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Microchip AT91 Periodic Interval Timer (PIT)
> +
> +maintainers:
> +  - Claudiu Beznea <claudiu.beznea@...rochip.com>
> +
> +description:
> +  Microchip AT91 periodic interval timer provides the operating system scheduler
> +  interrupt. It is designed to offer maximum accuracy and efficient management,
> +  even for systems with long response time.
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - items:
> +          - const: microchip,sama7g5-pit64b

>From where do you have this compatible? Wasn't in old binding and commit
msg does not explain it.


> +          - const: microchip,sam9x60-pit64b
> +      - items:
> +          enum:

These are not items. Just enum.. Does it even work?

> +            - atmel,at91sam9260-pit
> +            - microchip,sam9x60-pit64b
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    minItems: 1
> +    maxItems: 2
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clocks
> +
> +allOf:
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: atmel,at91sam9260-pit
> +    then:
> +      properties:
> +        interrupts:
> +          description:
> +            Shared interrupt between all system controller members (power management
> +            controller, watchdog, PIT, reset controller, real-time timer, real-time
> +            clock, memory controller, debug unit, system timer).
> +        clocks:
> +          maxItems: 1
> +
> +    else:
> +      properties:
> +        clocks:
> +          minItems: 2
> +        clock-names:
> +          items:
> +            - const: pclk
> +            - const: gclk

interrupts? They are still required, so why no description here?

> +      required:
> +        - clock-names
> +
> +unevaluatedProperties: false

additionalProperties:false instead

> +

Best regards,
Krzysztof