linux-kernel - Re: [PATCH] dt-bindings: timer: Convert faraday,fttmr010 to yaml

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Date:   Fri, 4 Jun 2021 16:11:19 -0500
From:   Rob Herring <robh@...nel.org>
To:     Corentin Labbe <clabbe@...libre.com>
Cc:     daniel.lezcano@...aro.org, tglx@...utronix.de,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: timer: Convert faraday,fttmr010 to yaml

On Fri, May 28, 2021 at 06:53:29PM +0000, Corentin Labbe wrote:
> Converts timer/faraday,fttmr010.txt to yaml.
> 
> Signed-off-by: Corentin Labbe <clabbe@...libre.com>
> ---
>  .../bindings/timer/faraday,fttmr010.txt       | 38 --------
>  .../bindings/timer/faraday,fttmr010.yaml      | 86 +++++++++++++++++++
>  2 files changed, 86 insertions(+), 38 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/timer/faraday,fttmr010.txt
>  create mode 100644 Documentation/devicetree/bindings/timer/faraday,fttmr010.yaml
> 
> diff --git a/Documentation/devicetree/bindings/timer/faraday,fttmr010.txt b/Documentation/devicetree/bindings/timer/faraday,fttmr010.txt
> deleted file mode 100644
> index 3cb2f4c98d64..000000000000
> --- a/Documentation/devicetree/bindings/timer/faraday,fttmr010.txt
> +++ /dev/null
> @@ -1,38 +0,0 @@
> -Faraday Technology timer
> -
> -This timer is a generic IP block from Faraday Technology, embedded in the
> -Cortina Systems Gemini SoCs and other designs.
> -
> -Required properties:
> -
> -- compatible : Must be one of
> -  "faraday,fttmr010"
> -  "cortina,gemini-timer", "faraday,fttmr010"
> -  "moxa,moxart-timer", "faraday,fttmr010"
> -  "aspeed,ast2400-timer"
> -  "aspeed,ast2500-timer"
> -  "aspeed,ast2600-timer"
> -
> -- reg : Should contain registers location and length
> -- interrupts : Should contain the three timer interrupts usually with
> -  flags for falling edge
> -
> -Optionally required properties:
> -
> -- clocks : a clock to provide the tick rate for "faraday,fttmr010"
> -- clock-names : should be "EXTCLK" and "PCLK" for the external tick timer
> -  and peripheral clock respectively, for "faraday,fttmr010"
> -- syscon : a phandle to the global Gemini system controller if the compatible
> -  type is "cortina,gemini-timer"
> -
> -Example:
> -
> -timer@...00000 {
> -	compatible = "faraday,fttmr010";
> -	reg = <0x43000000 0x1000>;
> -	interrupts = <14 IRQ_TYPE_EDGE_FALLING>, /* Timer 1 */
> -		   <15 IRQ_TYPE_EDGE_FALLING>, /* Timer 2 */
> -		   <16 IRQ_TYPE_EDGE_FALLING>; /* Timer 3 */
> -	clocks = <&extclk>, <&pclk>;
> -	clock-names = "EXTCLK", "PCLK";
> -};
> diff --git a/Documentation/devicetree/bindings/timer/faraday,fttmr010.yaml b/Documentation/devicetree/bindings/timer/faraday,fttmr010.yaml
> new file mode 100644
> index 000000000000..a495ea80c0fc
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/timer/faraday,fttmr010.yaml
> @@ -0,0 +1,86 @@
> +# SPDX-License-Identifier: (GPL-2.0+)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/timer/faraday,fttmr010.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Faraday Technology timer
> +
> +maintainers:
> +  - Linus Walleij <linus.walleij@...aro.org>
> +
> +description: |
> +  This timer is a generic IP block from Faraday Technology, embedded in the
> +  Cortina Systems Gemini SoCs and other designs.
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - const: faraday,fttmr010
> +      - items:
> +          - const: cortina,gemini-timer
> +          - const: faraday,fttmr010
> +      - items:
> +          - const: moxa,moxart-timer
> +          - const: faraday,fttmr010
> +      - const: aspeed,ast2400-timer
> +      - const: aspeed,ast2500-timer
> +      - const: aspeed,ast2600-timer
> +
> +  reg:
> +    maxItems: 1
> +
> +  resets:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 3
> +    description: Should contain the three timer interrupts usually with flags for falling edge
> +
> +  clocks:
> +    minItems: 2
> +
> +  clock-names:
> +    items:
> +      - const: "PCLK"
> +      - const: "EXTCLK"
> +
> +  syscon:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    maxItems: 1
> +
> +if:
> +  properties:
> +    compatible:
> +      contains:
> +        items:

This is wrong because 'contains' should be a schema applying to a single 
item whereas 'items' applies to the whole array.

> +          - const: cortina,gemini-timer

Just this is enough.

> +          - const: faraday,fttmr010
> +then:
> +  required:
> +    - syscon
> +else:
> +  properties:
> +    syscon: false
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    timer@...00000 {
> +      compatible = "faraday,fttmr010";
> +      reg = <0x43000000 0x1000>;
> +      interrupts = <14 IRQ_TYPE_EDGE_FALLING>, /* Timer 1 */
> +                   <15 IRQ_TYPE_EDGE_FALLING>, /* Timer 2 */
> +                   <16 IRQ_TYPE_EDGE_FALLING>; /* Timer 3 */
> +      clocks = <&extclk>, <&pclk>;
> +      clock-names = "PCLK", "EXTCLK";
> +      syscon = <&syscon>;

This should fail based on my read of the .txt binding.

> +    };
> +...
> -- 
> 2.31.1