Re: [PATCH v7 3/4] dt-bindings: mtd: marvell-nand: Convert to YAML DT scheme

[Chris Packham <Chris.Packham@alliedtelesis.co.nz>]

On 1/06/23 00:35, Conor Dooley wrote:
> Hey Chris,
>
> On Wed, May 31, 2023 at 11:54:55AM +1200, Chris Packham wrote:
>> From: Vadym Kochan <vadym.kochan@plvision.eu>
>>
>> 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@plvision.eu>
>> Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
>> ---
>>
>> Notes:
>>      Changes in v7:
>>      - Restore "label" and "partitions" properties (should be picked up via
>>        nand-controller.yaml but aren't)
>>      - Add/restore nand-on-flash-bbt and nand-ecc-mode which aren't covered
>>        by nand-controller.yaml.
>>      - Use "unevalautedProperties: false"
>>      - Corrections for clock-names, dma-names, nand-rb and nand-ecc-strength
>>      - Add pxa3xx-nand-controller example
>>      
>>      Changes in v6:
>>      - remove properties covered by nand-controller.yaml
>>      - add example using armada-8k compatible
>>      
>>      earlier changes:
>>      
>>      v5:
>>         1) Get back "label" and "partitions" properties but without
>>            ref to the "partition.yaml" which was wrongly used.
>>      
>>         2) Add "additionalProperties: false" for nand@ because all possible
>>            properties are described.
>>      
>>      v4:
>>         1) Remove "label" and "partitions" properties
>>      
>>         2) Use 2 clocks for A7K/8K platform which is a requirement
>>      
>>      v3:
>>        1) Remove txt version from the MAINTAINERS list
>>      
>>        2) Use enum for some of compatible strings
>>      
>>        3) Drop:
>>              #address-cells
>>              #size-cells:
>>      
>>           as they are inherited from the nand-controller.yaml
>>      
>>        4) Add restriction to use 2 clocks for A8K SoC
>>      
>>        5) Dropped description for clock-names and extend it with
>>           minItems: 1
>>      
>>        6) Drop description for "dmas"
>>      
>>        7) Use "unevalautedProperties: false"
>>      
>>        8) Drop quites from yaml refs.
>>      
>>        9) Use 4-space indentation for the example section
>>      
>>      v2:
>>        1) Fixed warning by yamllint with incorrect indentation for compatible list
>>
>>   .../bindings/mtd/marvell,nand-controller.yaml | 221 ++++++++++++++++++
>>   .../devicetree/bindings/mtd/marvell-nand.txt  | 126 ----------
>>   MAINTAINERS                                   |   1 -
>>   3 files changed, 221 insertions(+), 127 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..7cd4a2e99343
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/mtd/marvell,nand-controller.yaml
>> @@ -0,0 +1,221 @@
>> +# 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@bootlin.com>
>> +
>> +properties:
>> +  compatible:
>> +    oneOf:
>> +      - items:
>> +          - const: marvell,armada-8k-nand-controller
>> +          - const: marvell,armada370-nand-controller
> Apologies if I have missed this - but the commit message should probably
> explain where this fallback came from since it does not appear to be
> present in the original binding.
Yes I'll mention it.
>> +      - enum:
>> +          - marvell,armada370-nand-controller
>> +          - marvell,pxa3xx-nand-controller
>> +          - marvell,armada-8k-nand
>> +          - marvell,armada370-nand
>> +          - marvell,pxa3xx-nand
> Please mark these 3 as deprecated.
Will do
>> +
>> +  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
> As a nit, allOf below invalidates this second part of the sentence (in
> possibly a clearer way too).
I'm not quite sure what you mean. Is it just that the description is 
redundant now that the schema enforces the requirement or am I actually 
not enforcing things the way I think.
>> +    minItems: 1
>> +    maxItems: 2
>> +
>> +  clock-names:
>> +    minItems: 1
>> +    items:
>> +      - const: core
>> +      - const: reg
>> +
>> +  dmas:
>> +    maxItems: 1
>> +
>> +  dma-names:
>> +    items:
>> +      - enum:
> I don't think the items: here is needed, enum on its own suffices, no?

The trend in other bindings seems to be

   items:
      - const: value1
      - const: value2

so I'll go with that.

>
> Cheers,
> Conor.
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