Re: [PATCH v5 2/3] dt-bindings: hwmon: pmbus: add MPS MPQ8646 binding

[Krzysztof Kozlowski <krzk@kernel.org>]

On Fri, Jul 24, 2026 at 01:55:28AM +0200, Vincent Jardin wrote:
> Add a device-tree binding for the Monolithic Power Systems
> MPQ8646 step-down converter as a PMBus device.
> 
> The schema is inspired from the mpq8785e:
> same mps,vout-fb-divider-ratio-permille property (maximum: 2047),
> and const: mps,mpq8646.
> 
> Signed-off-by: Vincent Jardin <vjardin@free.fr>

A nit, subject: drop second/last, redundant "binding". The
"dt-bindings" prefix is already stating that these are bindings.
See also:
https://elixir.bootlin.com/linux/v7.1-rc7/source/Documentation/devicetree/bindings/submitting-patches.rst#L23

> ---
>  .../bindings/hwmon/pmbus/mps,mpq8646.yaml          | 50 ++++++++++++++++++++++
>  1 file changed, 50 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/hwmon/pmbus/mps,mpq8646.yaml b/Documentation/devicetree/bindings/hwmon/pmbus/mps,mpq8646.yaml
> new file mode 100644
> index 000000000000..7acf4f235b12
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/hwmon/pmbus/mps,mpq8646.yaml
> @@ -0,0 +1,50 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +# Copyright (c) 2026 Free Mobile - Vincent Jardin <vjardin@free.fr>
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/hwmon/pmbus/mps,mpq8646.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Monolithic Power Systems MPQ8646 PMBus Step-Down Converter (extended)
> +
> +maintainers:
> +  - Vincent Jardin <vjardin@free.fr>
> +
> +description: |

Do not need '|' unless you need to preserve formatting.

> +  MPS MPQ8646 PMBus step-down converter.
> +
> +properties:
> +  compatible:
> +    const: mps,mpq8646
> +
> +  reg:
> +    maxItems: 1
> +
> +  mps,vout-fb-divider-ratio-permille:
> +    description:
> +      The feedback resistor divider ratio, expressed in permille
> +      (Vfb / Vout * 1000). This value is written to the
> +      PMBUS_VOUT_SCALE_LOOP register and is required for correct output
> +      voltage presentation.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    minimum: 1
> +    maximum: 2047
> +    default: 706

Everything is the same as mps,mpq8785.yam, so why it cannot be added
there? Just grow the list of if:then: to cover your specific
constraints.

Even default is the same... I do not get why looking at other schema
which combines different devices with same default and same maximum
value, you still decided to create a new file.

Best regards,
Krzysztof