Re: [PATCH v3 1/2] dt-bindings: hwmon: Add MAX6639

From: Conor Dooley
Date: Fri Aug 04 2023 - 11:48:56 EST


On Thu, Aug 03, 2023 at 04:43:59PM +0200, Naresh Solanki wrote:
> From: Marcello Sylvester Bauer <sylv@xxxxxxx>
>
> Add binding documentation for Maxim MAX6639 fan-speed controller.
>
> Signed-off-by: Marcello Sylvester Bauer <sylv@xxxxxxx>
> Signed-off-by: Naresh Solanki <Naresh.Solanki@xxxxxxxxxxxxx>
> ---
> Changes in V3:
> - Update title
> - Add pulses-per-revolution, supplies & interrupts
> Changes in V2:
> - Update subject
> - Drop blank lines
> ---
> .../bindings/hwmon/maxim,max6639.yaml | 60 +++++++++++++++++++
> 1 file changed, 60 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/hwmon/maxim,max6639.yaml
>
> diff --git a/Documentation/devicetree/bindings/hwmon/maxim,max6639.yaml b/Documentation/devicetree/bindings/hwmon/maxim,max6639.yaml
> new file mode 100644
> index 000000000000..b3292061ca58
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/hwmon/maxim,max6639.yaml
> @@ -0,0 +1,60 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/hwmon/maxim,max6639.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Maxim MAX6639 Fan Controller
> +
> +maintainers:
> + - Naresh Solanki <Naresh.Solanki@xxxxxxxxxxxxx>
> +
> +description: |
> + The MAX6639 is a 2-channel temperature monitor with dual, automatic, PWM
> + fan-speed controller. It monitors its own temperature and one external
> + diode-connected transistor or the temperatures of two external diode-connected
> + transistors, typically available in CPUs, FPGAs, or GPUs.

> + fan-supply:
> + description: Phandle to the regulator that provides power to the fan.

> + pulses-per-revolution:
> + description:
> + Define the number of pulses per fan revolution for each tachometer
> + input as an integer.
> + $ref: /schemas/types.yaml#/definitions/uint32
> + enum: [1, 2, 3, 4]
> + default: 2

Apologies if I am digging up old wounds here, since there was quite a
bit of back and forth on the last version, but these two newly added
properties look to be common with the "pwm-fan" and with
"adi,axi-fan-control". At what point should these live in a common
schema instead?

Otherwise, this looks okay to me, although I'll leave things to
Krzysztof since he had a lot to say about the previous version.

Thanks,
Conor.

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