linux-kernel - Re: [PATCH RFC 3/6] thermal/drivers/generic-adc: Register as IIO device

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Message-ID: <20251012194114.094a61a3@jic23-huawei>
Date: Sun, 12 Oct 2025 19:41:14 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Luca Weiss <luca.weiss@...rphone.com>
Cc: David Lechner <dlechner@...libre.com>, Nuno Sá
 <nuno.sa@...log.com>, Andy Shevchenko <andy@...nel.org>, "Rafael J.
 Wysocki" <rafael@...nel.org>, Daniel Lezcano <daniel.lezcano@...aro.org>,
 Zhang Rui <rui.zhang@...el.com>, Lukasz Luba <lukasz.luba@....com>, Rob
 Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor
 Dooley <conor+dt@...nel.org>, Laxman Dewangan <ldewangan@...dia.com>, Bjorn
 Andersson <andersson@...nel.org>, Konrad Dybcio <konradybcio@...nel.org>,
 Hans de Goede <hansg@...nel.org>, Jens Reidel <adrian@...nlining.org>,
 Casey Connolly <casey.connolly@...aro.org>,
 ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
 linux-arm-msm@...r.kernel.org, linux-iio@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
 devicetree@...r.kernel.org
Subject: Re: [PATCH RFC 3/6] thermal/drivers/generic-adc: Register as IIO
 device

On Fri, 10 Oct 2025 13:22:01 +0200
Luca Weiss <luca.weiss@...rphone.com> wrote:

> Register an IIO channel to allow reading the temperature using the IIO
> interface.
> 
> Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>
Just one question below.

>  static int gadc_thermal_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
>  	struct gadc_thermal_info *gti;
> +	struct iio_dev *indio_dev;
> +	struct gadc_iio *data;
>  	int ret;
>  
>  	if (!dev->of_node) {
> @@ -153,6 +192,23 @@ static int gadc_thermal_probe(struct platform_device *pdev)
>  
>  	devm_thermal_add_hwmon_sysfs(dev, gti->tz_dev);
>  
> +	indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
> +	if (!indio_dev)
> +		return -ENOMEM;
> +
> +	data = iio_priv(indio_dev);
> +	data->gti = gti;
> +
> +	indio_dev->name = pdev->name;
what does this end up as?

obviously we don't really care what name the user space interface we
aren't using advertises but this should be something part number like.

> +	indio_dev->modes = INDIO_DIRECT_MODE;
> +	indio_dev->info = &gadc_adc_info;
> +	indio_dev->channels = gadc_adc_channels;
> +	indio_dev->num_channels = ARRAY_SIZE(gadc_adc_channels);
> +
> +	ret = devm_iio_device_register(dev, indio_dev);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "Failed to register IIO device\n");
> +
>  	return 0;
>  }
>  
>