linux-kernel - Re: [PATCH v3 1/3] dt-bindings: hwmon: Add Microchip emc2305 yaml schema

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Message-ID: <CAEnQRZCT4vfFBApv+C3Wp17Fk0-Rwx36h4eCTTygaXFYFipEGg@mail.gmail.com>
Date: Wed, 5 Mar 2025 14:47:45 +0200
From: Daniel Baluta <daniel.baluta@...il.com>
To: Frank Li <Frank.li@....com>, Krzysztof Kozlowski <krzk+dt@...nel.org>
Cc: florin.leotescu@....nxp.com, Jean Delvare <jdelvare@...e.com>, 
	Guenter Roeck <linux@...ck-us.net>, Rob Herring <robh@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Michael Shych <michaelsh@...dia.com>, linux-hwmon@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	viorel.suman@....com, carlos.song@....com, 
	linux-arm-kernel@...ts.infradead.org, imx@...ts.linux.dev, festevam@...il.com, 
	Florin Leotescu <florin.leotescu@....com>
Subject: Re: [PATCH v3 1/3] dt-bindings: hwmon: Add Microchip emc2305 yaml schema

Hello Frank, Conor, Krzysztof,

Thanks a lot for your comments and help.

In this initial patchseries we only add minimal OF support and
introduce a minimal binding.

> How did you pickup the maintainer entry?

We got the author of the first commit for
See 0d8400c5a2ce ("hwmon: (emc2305) add support for EMC2301/2/3/5 RPM-based")

> If only one reg You can go through trivial-devices.yaml

This is not a trivial device as we will add some specific properties
with our next patches
(e.g polarity etc)

> Missing descriptions of the fans, no?
> missing $ref to fan-controller schema.

Do we need to add this now? As this is only the minimal binding
support. We want to add that
in a follow up patch when we go into specifics.

> The emc2301 label here can be dropped, it is not used.

Will fix.

> The nodename should be "fan-controller", not pwm here I guess.

Sure, will fix.

On Tue, Mar 4, 2025 at 6:56 PM Frank Li <Frank.li@....com> wrote:
>
> On Tue, Mar 04, 2025 at 06:21:34PM +0200, florin.leotescu@....nxp.com wrote:
> > From: Florin Leotescu <florin.leotescu@....com>
> >
> > Introduce yaml schema for Microchip emc2305 pwm fan controller.
> >
> > Signed-off-by: Florin Leotescu <florin.leotescu@....com>
> > ---
> >  .../bindings/hwmon/microchip,emc2305.yaml     | 43 +++++++++++++++++++
> >  1 file changed, 43 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/hwmon/microchip,emc2305.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/hwmon/microchip,emc2305.yaml b/Documentation/devicetree/bindings/hwmon/microchip,emc2305.yaml
> > new file mode 100644
> > index 000000000000..cac0075a65bb
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/hwmon/microchip,emc2305.yaml
> > @@ -0,0 +1,43 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/hwmon/microchip,emc2305.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Microchip EMC2305 SMBus compliant PWM fan controller
> > +
> > +maintainers:
> > +  - Michael Shych <michaelsh@...dia.com>
>
> who is it? look like not Microchip and hwmon maintainer.
>
> > +
> > +description: |
>
> Needn't |
>
> > +  Microchip EMC2301/2/3/5 pwm controller which supports up
> > +  to five programmable fan control circuits
> > +
> > +properties:
> > +  compatible:
> > +    enum:
> > +      - microchip,emc2301
> > +      - microchip,emc2302
> > +      - microchip,emc2303
> > +      - microchip,emc2305
>
> According to your driver code look like all compatible with microchip,emc2301
>
> oneOf:
>   - enum:
>       - microchip,emc2301
>   - items:
>       - enum:
>           - microchip,emc2302
>           - microchip,emc2303
>           - microchip,emc2305
>       - const: microchip,emc2301
>
> So your driver just need one "microchip,emc2301" compatible string.
>
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    i2c {
> > +        #address-cells = <1>;
> > +        #size-cells = <0>;
> > +
> > +        emc2301: pwm@2f {
> > +            compatible = "microchip,emc2301";
> > +            reg = <0x2f>;
>
> If only one reg:
> You can go through trivial-devices.yaml
>
> Frank
>
> > +        };
> > +    };
> > --
> > 2.34.1
> >
>