linux-kernel - Re: [PATCH v6 1/2] dt-bindings: hwmon: Add Sophgo SG2042 external hardware monitor support

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Message-ID:
 <IA1PR20MB49539E946C2D5D025932ABEEBBD82@IA1PR20MB4953.namprd20.prod.outlook.com>
Date: Sun, 7 Jul 2024 07:34:15 +0800
From: Inochi Amaoto <inochiama@...look.com>
To: Guenter Roeck <linux@...ck-us.net>, 
	Inochi Amaoto <inochiama@...look.com>
Cc: Jean Delvare <jdelvare@...e.com>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Chen Wang <unicorn_wang@...look.com>, Jonathan Corbet <corbet@....net>, 
	Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, 
	Albert Ou <aou@...s.berkeley.edu>, linux-hwmon@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org, linux-riscv@...ts.infradead.org, 
	Conor Dooley <conor.dooley@...rochip.com>
Subject: Re: [PATCH v6 1/2] dt-bindings: hwmon: Add Sophgo SG2042 external
 hardware monitor support

On Sat, Jul 06, 2024 at 09:48:58AM GMT, Guenter Roeck wrote:
> On Wed, Jul 03, 2024 at 10:30:43AM +0800, 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>
> > Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>
> > ---
> >  .../hwmon/sophgo,sg2042-hwmon-mcu.yaml        | 43 +++++++++++++++++++
> >  1 file changed, 43 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/hwmon/sophgo,sg2042-hwmon-mcu.yaml
> > 
> > --
> > 2.45.2
> > 
> > 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..f0667ac41d75
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/hwmon/sophgo,sg2042-hwmon-mcu.yaml
> > @@ -0,0 +1,43 @@
> > +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/hwmon/sophgo,sg2042-hwmon-mcu.yaml#
> > +$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
> 
> According to the other patch, this actually covers four
> distinct models/devices.
> 
> static const struct sg2042_mcu_board_data sg2042_boards_data[] = {
> > +	{
> > +		.id = 0x80,
> > +		.name = "SG2042 evb x8",
> > +	},
> > +	{
> > +		.id = 0x81,
> > +		.name = "SG2042R evb",
> > +	},
> > +	{
> > +		.id = 0x83,
> > +		.name = "SG2042 evb x4",
> > +	},
> > +	{
> > +		.id = 0x90,
> > +		.name = "Milk-V Pioneer",
> > +	},
> > +};
> > +
> 
> Is it really appropriate to use a single compatible property for all of those ?
> 
> Guenter

These board can only be detected at running time (even this should on
a specific board). On real world, it can only sees a MCU onboard.
I don't think it is a good idea to add some bindings to cover these
model. It seems better to remove this array and let userspace to parse
these ids.

Regards,
Inochi