linux-kernel - Re: [net-next PATCH] dt-bindings: net: marvell,pp2: convert to json-schema

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Message-ID: <29fb0a59-8685-89b2-74de-2ccdce1c925c@linaro.org>
Date:   Fri, 23 Sep 2022 13:21:03 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Michał Grzelak <mig@...ihalf.com>,
        devicetree@...r.kernel.org
Cc:     mw@...ihalf.com, linux@...linux.org.uk, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        upstream@...ihalf.com
Subject: Re: [net-next PATCH] dt-bindings: net: marvell,pp2: convert to
 json-schema

On 22/09/2022 23:10, Michał Grzelak wrote:
> This converts the marvell,pp2 bindings from text to proper schema.
> 
> Move 'marvell,system-controller' and 'dma-coherent' properties from
> port up to the controller node, to match what is actually done in DT.
> 
> Signed-off-by: Michał Grzelak <mig@...ihalf.com>
> ---
>  .../devicetree/bindings/net/marvell,pp2.yaml  | 292 ++++++++++++++++++
>  .../devicetree/bindings/net/marvell-pp2.txt   | 141 ---------
>  MAINTAINERS                                   |   2 +-
>  3 files changed, 293 insertions(+), 142 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/net/marvell,pp2.yaml
>  delete mode 100644 Documentation/devicetree/bindings/net/marvell-pp2.txt
> 
> diff --git a/Documentation/devicetree/bindings/net/marvell,pp2.yaml b/Documentation/devicetree/bindings/net/marvell,pp2.yaml
> new file mode 100644
> index 000000000000..b4589594a0cc
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/marvell,pp2.yaml
> @@ -0,0 +1,292 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/net/marvell,pp2.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Marvell CN913X / Marvell Armada 375, 7K, 8K Ethernet Controller
> +
> +maintainers:
> +  - Marcin Wojtas <mw@...ihalf.com>
> +  - Russell King <linux@...linux.org>
> +
> +description: |
> +  Marvell Armada 375 Ethernet Controller (PPv2.1)
> +  Marvell Armada 7K/8K Ethernet Controller (PPv2.2)
> +  Marvell CN913X Ethernet Controller (PPv2.3)
> +

properties go first.

> +patternProperties:
> +

no need for blank line.

> +  '^interrupt': true

This is not a pattern..

> +  '^#.*-cells$': true

??? Nope. Please start from scratch either from recent similar bindings
or from example-schema.

> +
> +  '^eth[0-9a-f]*(@.*)?$':
> +    type: object
> +    properties:
> +
> +      interrupts:
> +        minItems: 1
> +        maxItems: 10
> +        description: interrupt(s) for the port
> +
> +      interrupt-names:
> +        minItems: 1
> +        maxItems: 10
> +
> +        items:
> +          oneOf:
> +            - pattern: "^hif[0-8]$"
> +            - pattern: "^tx-cpu[0-3]$"
> +              deprecated: true
> +            - const: link
> +            - const: rx-shared
> +              deprecated: true

List hast to be specific.

> +
> +        description: >
> +          if more than a single interrupt for is given, must be the
> +          name associated to the interrupts listed. Valid names are:
> +          "hifX", with X in [0..8], and "link". The names "tx-cpu0",
> +          "tx-cpu1", "tx-cpu2", "tx-cpu3" and "rx-shared" are supported
> +          for backward compatibility but shouldn't be used for new
> +          additions.
> +
> +      port-id:
> +        $ref: /schemas/types.yaml#/definitions/uint32
> +        description: ID of the port from the MAC point of view.
> +
> +      phy-mode:
> +        $ref: "ethernet-controller.yaml#/properties/phy-mode"
> +
> +      marvell,loopback:
> +        $ref: /schemas/types.yaml#/definitions/flag
> +        description: port is loopback mode.
> +
> +      phy:
> +        $ref: /schemas/types.yaml#/definitions/phandle
> +        description: >
> +          a phandle to a phy node defining the PHY address
> +          (as the reg property, a single integer).
> +
> +    required:
> +      - interrupts
> +      - port-id
> +      - phy-mode
> +
> +properties:
> +
> +  dma-coherent: true
> +
> +  compatible:

This goes first.

> +    enum:
> +      - marvell,armada-375-pp2
> +      - marvell,armada-7k-pp2
> +
> +  reg:
> +    minItems: 3
> +    maxItems: 4
> +
> +  marvell,system-controller:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description: a phandle to the system controller.
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +
> +allOf:
> +

No need for blank line.

> +  - $ref: ethernet-controller.yaml#
> +
> +  - if:
> +      not:
> +        patternProperties:
> +          '^eth[0-9a-f]*(@.*)?$':
> +            properties:
> +              interrupts:
> +                maxItems: 1
> +
> +    then:
> +      patternProperties:
> +        '^eth[0-9a-f]*(@.*)?$':
> +          required:
> +            - interrupt-names

Skip this.

> +
> +  - if:
> +      properties:
> +        compatible:
> +          const: marvell,armada-375-pp2
> +
> +    then:
> +      properties:
> +

Skip the blank lines after each new block.

> +        clocks:
> +          items:
> +            - description: main controller clock
> +            - description: GOP clock
> +
> +        clock-names:
> +          minItems: 2
> +          maxItems: 2
> +          items:
> +            enum:
> +              - pp_clk
> +              - gop_clk
> +
> +        reg:
> +          description: |
> +            For "marvell,armada-375-pp2", must contain the following register sets:
> +              - common controller registers
> +              - LMS registers
> +              - one register area per Ethernet port
> +
> +    else:
> +
> +      patternProperties:
> +        '^eth[0-9a-f]*(@.*)?$':
> +          properties:
> +            gop-port-id:
> +              $ref: /schemas/types.yaml#/definitions/uint32
> +              description: >
> +                only for marvell,armada-7k-pp2, ID of the port from the
> +                GOP (Group Of Ports) point of view. This ID is used to index the
> +                per-port registers in the second register area.
> +
> +          required:
> +            - gop-port-id
> +
> +      properties:
> +
> +        clocks:
> +          items:
> +            - description: main controller clock
> +            - description: GOP clock
> +            - description: MG clock
> +            - description: MG Core clock
> +            - description: AXI clock

Why clocks appear only here? All devices require clocks, so this should
be in top level.

> +
> +        clock-names:
> +          minItems: 5
> +          maxItems: 5
> +          items:
> +            enum:
> +              - gop_clk
> +              - pp_clk
> +              - mg_clk
> +              - mg_core_clk
> +              - axi_clk
> +
> +        reg:
> +          description: |
> +            For "marvell,armada-7k-pp2" used by 7K/8K and CN913X, must contain the following register sets:
> +              - packet processor registers
> +              - networking interfaces registers
> +              - CM3 address space used for TX Flow Control

Do not define properties in allOf:if:then, but in top-level place.

Really, start with example-schema. This deviates too much from existing
coding style.

Best regards,
Krzysztof