linux-kernel - Re: [PATCH v3 1/2] dt-bindings: hwmon: Add Sophgo SG2042 external hardware monitor support

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Message-ID:
 <IA1PR20MB4953F13D16B99FC04EB2AD30BB1A2@IA1PR20MB4953.namprd20.prod.outlook.com>
Date: Tue, 30 Apr 2024 16:27:48 +0800
From: Inochi Amaoto <inochiama@...look.com>
To: Krzysztof Kozlowski <krzk@...nel.org>, 
	Inochi Amaoto <inochiama@...look.com>, Jean Delvare <jdelvare@...e.com>, 
	Guenter Roeck <linux@...ck-us.net>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Chen Wang <unicorn_wang@...look.com>, Paul Walmsley <paul.walmsley@...ive.com>, 
	Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>
Cc: linux-hwmon@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v3 1/2] dt-bindings: hwmon: Add Sophgo SG2042 external
 hardware monitor support

On Tue, Apr 30, 2024 at 09:47:16AM GMT, Krzysztof Kozlowski wrote:
> On 29/04/2024 14:03, Inochi Amaoto wrote:
> > Due to the design, Sophgo SG2042 use an external MCU to provide
> > hardware information, thermal information and reset control.
> > 
> > Add bindings for this monitor device.
> > 
> > Signed-off-by: Inochi Amaoto <inochiama@...look.com>
> > ---
> >  .../hwmon/sophgo,sg2042-hwmon-mcu.yaml        | 40 +++++++++++++++++++
> >  1 file changed, 40 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/hwmon/sophgo,sg2042-hwmon-mcu.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/hwmon/sophgo,sg2042-hwmon-mcu.yaml b/Documentation/devicetree/bindings/hwmon/sophgo,sg2042-hwmon-mcu.yaml
> > new file mode 100644
> > index 000000000000..64a8403aaab8
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/hwmon/sophgo,sg2042-hwmon-mcu.yaml
> > @@ -0,0 +1,40 @@
> > +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/hwmon/sophgo,sg2042-hwmon-mcu.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Sophgo SG2042 onboard MCU support
> > +
> > +maintainers:
> > +  - Inochi Amaoto <inochiama@...look.com>
> > +
> > +properties:
> > +  compatible:
> > +    const: sophgo,sg2042-hwmon-mcu
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  "#thermal-sensor-cells":
> > +    const: 1
> 
> This looks like thermal sensor, so you miss ref to thermal-sensor.yaml
> in top-level. Just like other sensors.
> 

Thanks.

> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - "#thermal-sensor-cells"
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    i2c {
> > +        #address-cells = <1>;
> > +        #size-cells = <0>;
> > +
> > +        syscon@17 {
> 
> Are you sure this is syscon? 

My fault, I forgot to change the node type after moving.
I will replace this type with suitable one.

> Title says mcu, compatible says hwmon...

SG2042 use an external MCU to provide hwmon info (on the
motherboard, not in the SoC).
This is why I say this is MCU, and compatible says hwmon.

> 
> 
> Best regards,
> Krzysztof
>