linux-kernel - Re: [PATCH v2 1/2] dt-bindings: iio: max30100: Add pulse-width property

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Message-Id: <175992812188.3371104.5716471946724146308.robh@kernel.org>
Date: Wed, 08 Oct 2025 07:55:50 -0500
From: "Rob Herring (Arm)" <robh@...nel.org>
To: Shrikant Raskar <raskar.shree97@...il.com>
Cc: nuno.sa@...log.com, dlechner@...libre.com, linux-kernel@...r.kernel.org, 
 andy@...nel.org, linux-iio@...r.kernel.org, matt@...ostay.sg, 
 linux-kernel-mentees@...ts.linux.dev, krzk+dt@...nel.org, 
 devicetree@...r.kernel.org, skhan@...uxfoundation.org, jic23@...nel.org, 
 conor+dt@...nel.org, david.hunter.linux@...il.com
Subject: Re: [PATCH v2 1/2] dt-bindings: iio: max30100: Add pulse-width
 property


On Wed, 08 Oct 2025 08:47:36 +0530, Shrikant Raskar wrote:
> The appropriate LED pulse width for the MAX30100 depends on
> board-specific optical and mechanical design (lens, enclosure,
> LED-to-sensor distance) and the trade-off between measurement
> resolution and power consumption. Encoding it in Device Tree
> documents these platform choices and ensures consistent behavior.
> 
> Tested on: Raspberry Pi 3B + MAX30100 breakout board.
> 
> Signed-off-by: Shrikant Raskar <raskar.shree97@...il.com>
> 
> Changes since v1:
> Add unit suffix.
> Drop redundant description.
> 
> Link to v1:
> https://lore.kernel.org/all/20251004015623.7019-2-raskar.shree97@gmail.com/
> ---
>  .../devicetree/bindings/iio/health/maxim,max30100.yaml      | 6 ++++++
>  1 file changed, 6 insertions(+)
> 

My bot found errors running 'make dt_binding_check' on your patch:

yamllint warnings/errors:

dtschema/dtc warnings/errors:
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/iio/health/maxim,max30100.yaml: properties:maxim,pulse-width-us: 'enum' should not be valid under {'enum': ['const', 'enum', 'exclusiveMaximum', 'exclusiveMinimum', 'minimum', 'maximum', 'multipleOf', 'pattern']}
	hint: Scalar and array keywords cannot be mixed
	from schema $id: http://devicetree.org/meta-schemas/keywords.yaml#
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/iio/health/maxim,max30100.yaml: properties:maxim,pulse-width-us: 'anyOf' conditional failed, one must be fixed:
	'enum' is not one of ['maxItems', 'description', 'deprecated']
		hint: Only "maxItems" is required for a single entry if there are no constraints defined for the values.
	Additional properties are not allowed ('enum' was unexpected)
		hint: Arrays must be described with a combination of minItems/maxItems/items
	'maxItems' is not one of ['description', 'deprecated', 'const', 'enum', 'minimum', 'maximum', 'multipleOf', 'default', '$ref', 'oneOf']
	1 is less than the minimum of 2
		hint: Arrays must be described with a combination of minItems/maxItems/items
	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#

doc reference errors (make refcheckdocs):

See https://patchwork.ozlabs.org/project/devicetree-bindings/patch/20251008031737.7321-2-raskar.shree97@gmail.com

The base for the series is generally the latest rc1. A different dependency
should be noted in *this* patch.

If you already ran 'make dt_binding_check' and didn't see the above
error(s), then make sure 'yamllint' is installed and dt-schema is up to
date:

pip3 install dtschema --upgrade

Please check and re-submit after running the above command yourself. Note
that DT_SCHEMA_FILES can be set to your schema file to speed up checking
your schema. However, it must be unset to test all examples with your schema.