linux-kernel - Re: [PATCH v9 3/3] dt-bindings: mtd: marvell-nand: Convert to YAML DT scheme

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Message-ID: <f16e742f-e6f2-9761-e70d-e0e7cadcba4a@linaro.org>
Date:   Thu, 15 Jun 2023 09:45:20 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Chris Packham <chris.packham@...iedtelesis.co.nz>,
        miquel.raynal@...tlin.com, richard@....at, vigneshr@...com,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        andrew@...n.ch, gregory.clement@...tlin.com,
        sebastian.hesselbarth@...il.com
Cc:     linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Vadym Kochan <vadym.kochan@...ision.eu>
Subject: Re: [PATCH v9 3/3] dt-bindings: mtd: marvell-nand: Convert to YAML DT
 scheme

On 15/06/2023 06:04, Chris Packham wrote:
> From: Vadym Kochan <vadym.kochan@...ision.eu>
> 
> Switch the DT binding to a YAML schema to enable the DT validation.
> 
> The text binding didn't mention it as a requirement but existing usage
> has
> 
>    compatible = "marvell,armada-8k-nand-controller",
>                 "marvell,armada370-nand-controller";
> 
> so the YAML allows this in addition to the individual compatible values.
> 
> There was also an incorrect reference to dma-names being "rxtx" where
> the driver and existing device trees actually use dma-names = "data" so
> this is corrected in the conversion.
> 
> Signed-off-by: Vadym Kochan <vadym.kochan@...ision.eu>
> Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
> ---
> 
> Notes:
>     Changes in v9:
>     - depend on series from Miquel
>       https://lore.kernel.org/linux-mtd/20230606175246.190465-1-miquel.raynal@bootlin.com/
>     - enforce minimum/maximum for nand-rb
>     - move required: block for controller
>     - move unevaluatedProperties: for nand chip
>     - remove label, partitions and nand-on-flash-bbt which are covered by
>       generic schema
>     
>     Changes in v8:
>     - Mark deprecated compatible values as such
>     - Allow "marvell,armada-8k-nand-controller" without
>       "marvell,armada370-nand-controller"

???


> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - items:
> +          - const: marvell,armada-8k-nand-controller
> +          - const: marvell,armada370-nand-controller
> +      - enum:
> +          - marvell,armada-8k-nand-controller

This is wrong. 8k cannot be both: compatible and not compatible with
370. It's not someone's cat to be in both states at the same time...

> +          - marvell,armada370-nand-controller
> +          - marvell,pxa3xx-nand-controller
> +      - description: legacy bindings
> +        deprecated: true
> +        enum:
> +          - marvell,armada-8k-nand
> +          - marvell,armada370-nand
> +          - marvell,pxa3xx-nand
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    description:
> +      Shall reference the NAND controller clocks, the second one is
> +      is only needed for the Armada 7K/8K SoCs
> +    minItems: 1
> +    maxItems: 2
> +
> +  clock-names:
> +    minItems: 1
> +    items:
> +      - const: core
> +      - const: reg
> +
> +  dmas:
> +    maxItems: 1
> +
> +  dma-names:
> +    items:
> +      - const: data
> +
> +  marvell,system-controller:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description: Syscon node that handles NAND controller related registers
> +
> +patternProperties:
> +  "^nand@[a-f0-9]$":
> +    type: object
> +    $ref: raw-nand-chip.yaml
> +
> +    properties:
> +      reg:
> +        minimum: 0
> +        maximum: 3
> +
> +      nand-rb:
> +        items:
> +          - minimum: 0
> +            maximum: 1
> +
> +      nand-ecc-step-size:
> +        const: 512
> +
> +      nand-ecc-strength:
> +        enum: [1, 4, 8, 12, 16]
> +
> +      nand-ecc-mode:
> +        const: hw
> +
> +      marvell,nand-keep-config:
> +        $ref: /schemas/types.yaml#/definitions/flag
> +        description: |

Do not need '|' unless you need to preserve formatting.

> +          Orders the driver not to take the timings from the core and
> +          leaving them completely untouched. Bootloader timings will then
> +          be used.
> +
> +      marvell,nand-enable-arbiter:
> +        $ref: /schemas/types.yaml#/definitions/flag
> +        description: |

Do not need '|' unless you need to preserve formatting.

> +          To enable the arbiter, all boards blindly used it,
> +          this bit was set by the bootloader for many boards and even if
> +          it is marked reserved in several datasheets, it might be needed to set
> +          it (otherwise it is harmless).
> +        deprecated: true
> +
> +    required:
> +      - reg
> +      - nand-rb
> +
> +    unevaluatedProperties: false
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clocks
> +
> +allOf:
> +  - $ref: nand-controller.yaml#
> +
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: marvell,pxa3xx-nand-controller
> +    then:
> +      required:
> +        - dmas
> +        - dma-names
> +
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: marvell,armada-8k-nand-controller
> +    then:
> +      properties:
> +        clocks:
> +          minItems: 2
> +
> +        clock-names:
> +          minItems: 2
> +
> +      required:
> +        - marvell,system-controller

else:
narrow clocks to 1? Or is the second clod also valid for other variants?
Does not look like from your example.


Best regards,
Krzysztof