linux-kernel - Re: [PATCH 2/3] dt-bindings: regulator: Add Fitipower FP9931/JD9930

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Message-ID: <20251109221212.182d7862@kemnade.info>
Date: Sun, 9 Nov 2025 22:12:12 +0100
From: Andreas Kemnade <andreas@...nade.info>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Liam Girdwood <lgirdwood@...il.com>,
 Mark Brown <broonie@...nel.org>, Guenter Roeck <linux@...ck-us.net>,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-hwmon@...r.kernel.org
Subject: Re: [PATCH 2/3] dt-bindings: regulator: Add Fitipower FP9931/JD9930

On Sun, 9 Nov 2025 18:13:11 +0100
Krzysztof Kozlowski <krzk@...nel.org> wrote:

> On 08/11/2025 17:52, Andreas Kemnade wrote:
> > On Sat, 8 Nov 2025 15:46:01 +0100
> > Krzysztof Kozlowski <krzk@...nel.org> wrote:
> >   
> >>>>> +  fiti,tdly:      
> >>>>
> >>>> No, look at datasheet. What values are there? ms.
> >>>>    
> >>> Hmm, no to what? I do not understand your comment.    
> >>
> >> Please use proper units for the field expressed in the property name
> >> suffix and possible values (enum).
> >> https://github.com/devicetree-org/dt-schema/blob/main/dtschema/schemas/property-units.yaml
> >>
> >> You also need default.
> >>  
> >>> So I guess a bit what might be options to discuss here:
> >>> - put raw value for the bitfield here (what is currently done).
> >>> - put the ms values here (then I would expect a suffix in the property name)
> >>>   We have the mapping 0ms - 0, 1ms - 1, 2ms - 2, 4ms - 3, so it is
> >>>   not identical.    
> >> I don't know what has to be identical. You want here 0, 1, 2 or 4 ms.
> >> BTW, if you speak about driver complexity, getting register value out of
> >> above is absolutely trivial, so not a suitable argument.  
> > 
> > Ok, no problem with doing that trivial conversion in the driver.
> > 
> > Playing around with dt-binding-check and add enums (and the -ms in a
> > second step):
> >   fitipower,tdlys:
> >     $ref: /schemas/types.yaml#/definitions/uint32-array
> >     description:
> >       Power up soft start delay settings tDLY1-4 bitfields in the
> >       POWERON_DELAY register
> >     default: <0 0 0 0>
> >     items:
> >       - enum:
> >           - 0
> >           - 1
> >           - 2
> >           - 4
> >       - enum:
> >           - 0
> >           - 1
> >           - 2
> >           - 4
> >       - enum:
> >           - 0
> >           - 1
> >           - 2
> >           - 4
> >       - enum:
> >           - 0
> >           - 1
> >           - 2
> >           - 4
> > 
> > 
> > dt-binding-check accepts this, including the example. But if I change it to -ms
> > as you requested, I get
> > 
> > /home/andi/old-home/andi/kobo/kernel/Documentation/devicetree/bindings/regulator/fitipower,fp9931.yaml: properties:fitipower,tdly-ms: 'anyOf' conditional failed, one must be fixed:
> > 	'maxItems' is a required property
> > 		hint: Only "maxItems" is required for a single entry if there are no constraints defined for the values.
> > 	'$ref' is not one of ['maxItems', 'description', 'deprecated']
> > 		hint: Only "maxItems" is required for a single entry if there are no constraints defined for the values.
> > 	'default' is not one of ['maxItems', 'description', 'deprecated']
> > 		hint: Only "maxItems" is required for a single entry if there are no constraints defined for the values.
> > 	'items' is not one of ['maxItems', 'description', 'deprecated']
> > 		hint: Only "maxItems" is required for a single entry if there are no constraints defined for the values.
> > 	Additional properties are not allowed ('$ref', 'default' were unexpected)
> > 		hint: Arrays must be described with a combination of minItems/maxItems/items
> > 	'items' is not one of ['description', 'deprecated', 'const', 'enum', 'minimum', 'maximum', 'multipleOf', 'default', '$ref', 'oneOf']
> > 	'<0 0 0 0>' is not of type 'integer'
> > 	hint: cell array properties must define how many entries and what the entries are when there is more than one entry.
> > 	from schema $id: http://devicetree.org/meta-schemas/core.yaml#
> > /home/andi/old-home/andi/kobo/kernel/Documentation/devicetree/bindings/regulator/fitipower,fp9931.yaml: properties:fitipower,tdly-ms: '$ref' should not be valid under {'const': '$ref'}
> > 	hint: Standard unit suffix properties don't need a type $ref
> > 	from schema $id: http://devicetree.org/meta-schemas/core.yaml#
> > /home/andi/old-home/andi/kobo/kernel/Documentation/devicetree/bindings/regulator/fitipower,fp9931.yaml: properties:fitipower,tdly-ms: 'anyOf' conditional failed, one must be fixed:
> > 	'maxItems' is a required property
> > 		hint: Only "maxItems" is required for a single entry if there are no constraints defined for the values.
> > 	'$ref' is not one of ['maxItems', 'description', 'deprecated']
> > 		hint: Only "maxItems" is required for a single entry if there are no constraints defined for the values.
> > 	'default' is not one of ['maxItems', 'description', 'deprecated']
> > 		hint: Only "maxItems" is required for a single entry if there are no constraints defined for the values.
> > 	'items' is not one of ['maxItems', 'description', 'deprecated']
> > 		hint: Only "maxItems" is required for a single entry if there are no constraints defined for the values.
> > 	Additional properties are not allowed ('$ref', 'default' were unexpected)
> > 		hint: Arrays must be described with a combination of minItems/maxItems/items
> > 	'items' is not one of ['description', 'deprecated', 'const', 'enum', 'minimum', 'maximum', 'multipleOf', 'default', '$ref', 'oneOf']
> > 	'<0 0 0 0>' is not of type 'integer'
> > 	hint: cell array properties must define how many entries and what the entries are when there is more than one entry.
> > 	from schema $id: http://devicetree.org/meta-schemas/core.yaml#
> > /home/andi/old-home/andi/kobo/kernel/Documentation/devicetree/bindings/regulator/fitipower,fp9931.yaml: properties:fitipower,tdly-ms: '$ref' should not be valid under {'const': '$ref'}
> > 	hint: Standard unit suffix properties don't need a type $ref
> > 	from schema $id: http://devicetree.org/meta-schemas/core.yaml#  
> 
> You must drop ref. That's the entire point of common unit suffix.
> 
I tried without it:

  fitipower,tdly-ms:
    description:
      Power up soft start delay settings tDLY1-4 bitfields in the
      POWERON_DELAY register
    default: <0 0 0 0>
    items:
      - enum:
          - 0
          - 1
          - 2
          - 4
      - enum:
          - 0
          - 1
          - 2
          - 4
      - enum:
          - 0
          - 1
          - 2
          - 4
      - enum:
          - 0
          - 1
          - 2
          - 4


Errors:

  CHKDT   ./Documentation/devicetree/bindings
/home/andi/old-home/andi/kobo/kernel/Documentation/devicetree/bindings/regulator/fitipower,fp9931.yaml: properties:fitipower,tdly-ms: 'anyOf' conditional failed, one must be fixed:
	'maxItems' is a required property
		hint: Only "maxItems" is required for a single entry if there are no constraints defined for the values.
	'default' is not one of ['maxItems', 'description', 'deprecated']
		hint: Only "maxItems" is required for a single entry if there are no constraints defined for the values.
	'items' is not one of ['maxItems', 'description', 'deprecated']
		hint: Only "maxItems" is required for a single entry if there are no constraints defined for the values.
	Additional properties are not allowed ('default' was unexpected)
		hint: Arrays must be described with a combination of minItems/maxItems/items
	'items' is not one of ['description', 'deprecated', 'const', 'enum', 'minimum', 'maximum', 'multipleOf', 'default', '$ref', 'oneOf']
	'<0 0 0 0>' is not of type 'integer'
	hint: cell array properties must define how many entries and what the entries are when there is more than one entry.
	from schema $id: http://devicetree.org/meta-schemas/core.yaml#
/home/andi/old-home/andi/kobo/kernel/Documentation/devicetree/bindings/regulator/fitipower,fp9931.yaml: properties:fitipower,tdly-ms: 'anyOf' conditional failed, one must be fixed:
	'maxItems' is a required property
		hint: Only "maxItems" is required for a single entry if there are no constraints defined for the values.
	'default' is not one of ['maxItems', 'description', 'deprecated']
		hint: Only "maxItems" is required for a single entry if there are no constraints defined for the values.
	'items' is not one of ['maxItems', 'description', 'deprecated']
		hint: Only "maxItems" is required for a single entry if there are no constraints defined for the values.
	Additional properties are not allowed ('default' was unexpected)
		hint: Arrays must be described with a combination of minItems/maxItems/items
	'items' is not one of ['description', 'deprecated', 'const', 'enum', 'minimum', 'maximum', 'multipleOf', 'default', '$ref', 'oneOf']
	'<0 0 0 0>' is not of type 'integer'
	hint: cell array properties must define how many entries and what the entries are when there is more than one entry.
	from schema $id: http://devicetree.org/meta-schemas/core.yaml#

maxItems is required according to error message, so trying with...

  SCHEMA  Documentation/devicetree/bindings/processed-schema.json
  CHKDT   ./Documentation/devicetree/bindings
/home/andi/old-home/andi/kobo/kernel/Documentation/devicetree/bindings/regulator/fitipower,fp9931.yaml: properties:fitipower,tdly-ms: {'description': 'Power up soft start delay settings tDLY1-4 bitfields in the POWERON_DELAY register', 'default': '<0 0 0 0>', 'maxItems': 4, 'items': [{'enum': [0, 1, 2, 4]}, {'enum': [0, 1, 2, 4]}, {'enum': [0, 1, 2, 4]}, {'enum': [0, 1, 2, 4]}]} should not be valid under {'required': ['maxItems']}
	hint: "maxItems" is not needed with an "items" list
	from schema $id: http://devicetree.org/meta-schemas/items.yaml#
/home/andi/old-home/andi/kobo/kernel/Documentation/devicetree/bindings/regulator/fitipower,fp9931.yaml: properties:fitipower,tdly-ms: 'anyOf' conditional failed, one must be fixed:
	'default' is not one of ['maxItems', 'description', 'deprecated']
		hint: Only "maxItems" is required for a single entry if there are no constraints defined for the values.
	'items' is not one of ['maxItems', 'description', 'deprecated']
		hint: Only "maxItems" is required for a single entry if there are no constraints defined for the values.
	Additional properties are not allowed ('default' was unexpected)
		hint: Arrays must be described with a combination of minItems/maxItems/items
	'maxItems' is not one of ['description', 'deprecated', 'const', 'enum', 'minimum', 'maximum', 'multipleOf', 'default', '$ref', 'oneOf']
	'items' is not one of ['description', 'deprecated', 'const', 'enum', 'minimum', 'maximum', 'multipleOf', 'default', '$ref', 'oneOf']
	'<0 0 0 0>' is not of type 'integer'
	1 was expected
		hint: Only "maxItems" is required for a single entry if there are no constraints defined for the values.
	hint: cell array properties must define how many entries and what the entries are when there is more than one entry.
	from schema $id: http://devicetree.org/meta-schemas/core.yaml#
/home/andi/old-home/andi/kobo/kernel/Documentation/devicetree/bindings/regulator/fitipower,fp9931.yaml: properties:fitipower,tdly-ms: 'anyOf' conditional failed, one must be fixed:
	'default' is not one of ['maxItems', 'description', 'deprecated']
		hint: Only "maxItems" is required for a single entry if there are no constraints defined for the values.
	'items' is not one of ['maxItems', 'description', 'deprecated']
		hint: Only "maxItems" is required for a single entry if there are no constraints defined for the values.
	Additional properties are not allowed ('default' was unexpected)
		hint: Arrays must be described with a combination of minItems/maxItems/items
	'maxItems' is not one of ['description', 'deprecated', 'const', 'enum', 'minimum', 'maximum', 'multipleOf', 'default', '$ref', 'oneOf']
	'items' is not one of ['description', 'deprecated', 'const', 'enum', 'minimum', 'maximum', 'multipleOf', 'default', '$ref', 'oneOf']
	'<0 0 0 0>' is not of type 'integer'
	1 was expected
		hint: Only "maxItems" is required for a single entry if there are no constraints defined for the values.
	hint: cell array properties must define how many entries and what the entries are when there is more than one entry.
	from schema $id: http://devicetree.org/meta-schemas/core.yaml#


BTW: before you ask: dt-schema is version 2025.8

removing items and default removes all problems. 
So working: 
  - fitipower,tdly without -ms suffix
  - fitipower,tdly-ms without default and items but maxItems.


Regards,
Andreas