Re: [PATCH v6 2/4] dt-bindings: hwmon: pmbus: add MPS MPQ8646

[sashiko-bot@kernel.org]

Thank you for your contribution! Sashiko AI review found 1 potential issue(s) to consider:
- [Medium] The newly added compatible string 'mps,mpq8646' lacks driver support in the mpq8785 PMBus driver.
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--- Patch [2]: [PATCH v6 2/4] dt-bindings: hwmon: pmbus: add MPS MPQ8646 ---
commit 341628a3dba9f658492690f20d45d96084eb12d5
Author: Vincent Jardin <vjardin@free.fr>

dt-bindings: hwmon: pmbus: add MPS MPQ8646

This commit adds the mps,mpq8646 compatible string to the existing MPQ8785
device tree schema. The MPQ8646 step-down converter shares the same
constraints for the mps,vout-fb-divider-ratio-permille property as the
mpq8785.

> diff --git a/Documentation/devicetree/bindings/hwmon/pmbus/mps,mpq8785.yaml b/Documentation/devicetree/bindings/hwmon/pmbus/mps,mpq8785.yaml
> index 90970a0433e95..d7a32fb3b7af6 100644
> --- a/Documentation/devicetree/bindings/hwmon/pmbus/mps,mpq8785.yaml
> +++ b/Documentation/devicetree/bindings/hwmon/pmbus/mps,mpq8785.yaml
> @@ -18,6 +18,7 @@ properties:
>        - mps,mpm3695
>        - mps,mpm3695-25
>        - mps,mpm82504
> +      - mps,mpq8646

[Severity: Medium]
Should the corresponding driver (drivers/hwmon/pmbus/mpq8785.c) also be
updated to match this new compatible string?

Because the DT schema specifies the compatible string as an enum rather than
allowing a fallback (e.g. to "mps,mpq8785"), it appears the MPQ8646 device 
will fail to probe. The OF match table in mpq8785_of_match currently lacks 
an entry for this new hardware:

static const struct of_device_id __maybe_unused mpq8785_of_match[] = {
	{ .compatible = "mps,mpm3695", .data = (void *)mpm3695 },
	{ .compatible = "mps,mpm3695-25", .data = (void *)mpm3695_25 },
	{ .compatible = "mps,mpm82504", .data = (void *)mpm82504 },
	{ .compatible = "mps,mpq8785", .data = (void *)mpq8785 },
	{ }
};

The I2C ID table in mpq8785_id is similarly missing an "mpq8646" entry.
Without these additions, will a device instantiated via this new standalone
compatible string be completely ignored by the driver?

>        - mps,mpq8785

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260729-mpq8646_v0-v6-0-98848151cdb4@free.fr?part=2