linux-kernel - Re: [PATCH 1/2] dt-bindings: mtd: marvell-nand: Convert to YAML DT scheme

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Message-ID: <8cc7a8b6-0ca9-bc61-77e3-abf24cfbc909@linaro.org>
Date:   Mon, 24 Oct 2022 16:51:15 -0400
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Vadym Kochan <vadym.kochan@...ision.eu>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Andrew Lunn <andrew@...n.ch>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:     Elad Nachman <enachman@...vell.com>
Subject: Re: [PATCH 1/2] dt-bindings: mtd: marvell-nand: Convert to YAML DT
 scheme

On 24/10/2022 15:48, Vadym Kochan wrote:
> Hi Krzysztof,
> 
> On Sat, 22 Oct 2022 12:18:49 -0400, Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> wrote:
>> On 21/10/2022 15:45, Vadym Kochan wrote:
>>> Switch the DT binding to a YAML schema to enable the DT validation.
>>>
>>> Dropped deprecated compatibles and properties described in txt file.
>>>
>>> Signed-off-by: Vadym Kochan <vadym.kochan@...ision.eu>
>>> ---
>>>  .../bindings/mtd/marvell,nand-controller.yaml | 199 ++++++++++++++++++
>>>  .../devicetree/bindings/mtd/marvell-nand.txt  | 126 -----------
>>>  2 files changed, 199 insertions(+), 126 deletions(-)
>>>  create mode 100644 Documentation/devicetree/bindings/mtd/marvell,nand-controller.yaml
>>>  delete mode 100644 Documentation/devicetree/bindings/mtd/marvell-nand.txt
>>>
>>> diff --git a/Documentation/devicetree/bindings/mtd/marvell,nand-controller.yaml b/Documentation/devicetree/bindings/mtd/marvell,nand-controller.yaml
>>> new file mode 100644
>>> index 000000000000..535b7f8903c8
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/mtd/marvell,nand-controller.yaml
>>> @@ -0,0 +1,199 @@
>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>> +%YAML 1.2
>>> +---
>>> +$id: http://devicetree.org/schemas/mtd/marvell,nand-controller.yaml#
>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>> +
>>> +title: Marvell NAND Flash Controller (NFC)
>>> +
>>> +maintainers:
>>> +  - Miquel Raynal <miquel.raynal@...tlin.com>
>>
>> This should be someone responsible for hardware, not subsystem
>> maintainer. Unless by coincidence Miquel matches both. :)
>>
>>> +
>>> +properties:
>>> +
>>> +  compatible:
>>> +    oneOf:
>>> +      - items:
>>> +        - const: marvell,armada-8k-nand-controller
>>> +        - const: marvell,armada370-nand-controller
>>
>> Does not look like you tested the bindings. Please run `make
>> dt_binding_check` (see
>> Documentation/devicetree/bindings/writing-schema.rst for instructions).
> 
> Yes, on v1 I did not use yamllint, but installed after Rob pointed
> on some lint warnings.

I did not say about yamllint.

> 
>>
>>> +      - const: marvell,armada370-nand-controller
>>> +      - const: marvell,pxa3xx-nand-controller
>>
>> These two are just enum.
>>
> 
> OK.
> 
>>> +
>>> +  reg:
>>> +    maxItems: 1
>>> +
>>> +  "#address-cells":
>>> +    const: 1
>>
>> Drop, comes with nand-controller.yaml
>>
> 
> OK.
> 
>>> +
>>> +  "#size-cells":
>>> +    const: 0
>>
>> Ditto
>>
> 
> OK.
> 
>>> +
>>> +  interrupts:
>>> +    maxItems: 1
>>> +
>>> +  clocks:
>>> +    minItems: 1
>>> +    maxItems: 2
>>> +    description: |
>>
>> No need for |
>>
>>> +     Shall reference the NAND controller clocks, the second one is
>>> +     is only needed for the Armada 7K/8K SoCs
>>
>> You need allOf:if:then restricting it further per variant.
>>
> 
> OK, added.
> 
>>> +
>>> +  clock-names:
>>> +    items:
>>> +      - const: core
>>> +      - const: reg
>>> +    description: |
>>> +      Mandatory if there is a second clock, in this case there
>>> +      should be one clock named "core" and another one named "reg"
>>
>> The message is confusing. What is mandatory if there is a second clock?
>> Plus, the binding requires two clocks.
>>
>> Drop entire description.
>>
>> minItems: 1
>>
> 
> OK, droped (I used from the txt version).
> Added minItems.
> 
>>
>>> +
>>> +  dmas:
>>> +    maxItems: 1
>>> +    description: rxtx DMA channel
>>
>> Drop description.
>>
> 
> OK.
> 
>>> +
>>> +  dma-names:
>>> +    items:
>>> +      - const: rxtx
>>> +
>>> +  marvell,system-controller:
>>> +    $ref: /schemas/types.yaml#/definitions/phandle
>>> +    description: Syscon node that handles NAND controller related registers
>>> +
>>> +patternProperties:
>>> +  "^nand@[0-3]$":
>>> +    type: object
>>> +    properties:
>>> +
>>
>> Drop blank line.
>>
> 
> OK.
> 
>>> +      reg:
>>> +        minimum: 0
>>> +        maximum: 3
>>> +
>>> +      nand-rb:
>>> +        minimum: 0
>>> +        maximum: 1
>>> +
>>> +      nand-ecc-strength:
>>> +        enum: [1, 4, 8]
>>> +
>>> +      nand-on-flash-bbt: true
>>> +
>>> +      nand-ecc-mode: true
>>> +
>>> +      nand-ecc-algo:
>>> +        description: |
>>> +          This property is essentially useful when not using hardware ECC.
>>> +          Howerver, it may be added when using hardware ECC for clarification
>>> +          but will be ignored by the driver because ECC mode is chosen depending
>>> +          on the page size and the strength required by the NAND chip.
>>> +          This value may be overwritten with nand-ecc-strength property.
>>> +
>>> +      nand-ecc-step-size:
>>> +        const: 512
>>
>> Why this is const?
>>
> 
> Removed const.
> 
>>> +        description: |
>>> +          Marvell's NAND flash controller does use fixed strength
>>> +          (1-bit for Hamming, 16-bit for BCH), so the actual step size
>>> +          will shrink or grow in order to fit the required strength.
>>> +          Step sizes are not completely random for all and follow certain
>>> +          patterns described in AN-379, "Marvell SoC NFC ECC".
>>> +
>>> +      label:
>>> +        $ref: /schemas/types.yaml#/definitions/string
>>> +
>>> +      partitions:
>>> +        type: object
>>> +        $ref: "/schemas/mtd/partitions/partition.yaml"
>>
>> Drop quotes
>>
> 
> OK.
> 
>>         unevalautedProperties: false
>>
>> and then you will see errors, because you referenced schema for one
>> partition.
>>
> 
> Hm, I did not see errors with partitions with- or without "unevaluatedProperties".

As pointed before and here - I am not sure if you tested the bindings,
so of course then will be no warnings...

Best regards,
Krzysztof