linux-kernel - Re: [PATCH 4/5] iio: mcp9600: Add support for thermocouple-type

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Message-ID: <2025081622-industrious-dragonfly-ed3cba@boujee-and-buff>
Date: Sat, 16 Aug 2025 22:54:14 -0400
From: Ben Collins <ben.collins@...ux.dev>
To: David Lechner <dlechner@...libre.com>
Cc: Ben Collins <bcollins@...ter.com>, Jonathan Cameron <jic23@...nel.org>, 
	Nuno Sá <nuno.sa@...log.com>, Andy Shevchenko <andy@...nel.org>, linux-iio@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/5] iio: mcp9600: Add support for thermocouple-type

On Sat, Aug 16, 2025 at 01:24:24PM -0500, David Lechner wrote:
> On 8/15/25 11:46 AM, Ben Collins wrote:
> > dt-bindings documentation for this driver claims to support
> > thermocouple-type, but the driver does not actually make use of
> > the property.
> > 
> > Implement usage of the property to configure the chip for the
> > selected thermocouple-type.
> > 
> > Signed-off-by: Ben Collins <bcollins@...ter.com>
> > ---
> 
> ...
> 
> > @@ -453,6 +504,24 @@ static int mcp9600_probe(struct i2c_client *client)
> >  	data = iio_priv(indio_dev);
> >  	data->client = client;
> >  
> > +	/* Accept type from dt with default of Type-K. */
> 
> We still also need a dt-bindings patch to specify the default there as well.

The existing bindings file for this already states type-k is the
default. Is there something else it needs?

> > +	data->thermocouple_type = THERMOCOUPLE_TYPE_K;
> > +	ret = device_property_read_u32(&client->dev, "thermocouple-type",
> > +				       &data->thermocouple_type);
> > +	if (ret < 0 && ret != -EINVAL)
> > +		return dev_err_probe(&client->dev, ret,
> > +				     "Error reading thermocouple-type property\n");
> > +
> > +	if (data->thermocouple_type >= ARRAY_SIZE(mcp9600_type_map))
> > +		return dev_err_probe(&client->dev, -EINVAL,
> > +				     "Invalid thermocouple-type property %u.\n",
> > +				     data->thermocouple_type);
> > +
> > +	/* Set initial config. */
> > +	ret = mcp9600_config(data);
> > +	if (ret < 0)
> > +		return ret;
> > +
> >  	ch_sel = mcp9600_probe_alerts(indio_dev);
> >  	if (ch_sel < 0)
> >  		return ch_sel;
> 
> 

-- 
 Ben Collins
 https://libjwt.io
 https://github.com/benmcollins
 --
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