Re: [PATCH 2/2] iio: adc: ti-ads1015: Add support for label

[Andy Shevchenko]

On Tue, Sep 01, 2026 at 09:43:02PM +0300, Flaviu Nistor wrote:
> Add support for label sysfs attribute similar to other adc devices. This is
> particularly useful because the label can match the schematic signal name,
> identifying channel voltages easier if label is defined via device tree.

...

> +static int ads1015_read_label(struct iio_dev *indio_dev,
> +			      struct iio_chan_spec const *chan, char *label)
> +{
> +	struct ads1015_data *data = iio_priv(indio_dev);
> +	const char *name = data->channel_data[chan->address].label;

> +	/*
> +	 * Avoid printing "(null)" in the console in case label property
> +	 * is missing for the channel.
> +	 */
> +	if (!name)
> +		name = "";

No need, you can assign below whatever you want for the default case.

> +	return sysfs_emit(label, "%s\n", name);
> +}

...

> static int ads1015_client_get_channels_config(struct i2c_client *client)

>  	struct ads1015_data *data = iio_priv(indio_dev);
>  	struct device *dev = &client->dev;
>  	int i = -1;
> +	const char *label;

Keep reversed xmas tree order.

...

> +		if (!fwnode_property_read_string(node, "label", &label))
> +			data->channel_data[channel].label = label;

We want something like

		if (fwnode_property_present(...)) {
			ret = fwnode_property_read_string(...);
			if (ret)
				return ret;

			...use label...
		} else {
			...assign default...
		}

-- 
With Best Regards,
Andy Shevchenko