Re: [PATCH v4 4/7] iio: adc: hx711: introduce hx711_chip_info per-variant structure

[Andy Shevchenko <andriy.shevchenko@intel.com>]

On Mon, Apr 27, 2026 at 03:39:35PM +0530, Piyush Patle wrote:
> Add struct hx711_chip_info to hold per-variant static configuration:
> device name, IIO channel spec array, IIO info ops pointer, and channel
> count. Store a chip_info pointer in hx711_data and populate indio_dev
> fields from it at probe time instead of hardcoding them.
> 
> Use device_get_match_data() to look up the chip_info pointer from the
> of_device_id table. Guard against a NULL return so that the driver
> fails cleanly if probed via the platform name match path without
> associated match data.
> 
> No functional change for existing HX711 users.

All the above is fine, but I missed the answer to the question "why?"
You need to add that this is preparatory change to add more HW support
or something alike along these words.

...

> +static const struct hx711_chip_info hx711_chip = {
> +	.name		= "hx711",
> +	.channels	= hx711_chan_spec,
> +	.iio_info	= &hx711_iio_info,
> +	.num_channels	= ARRAY_SIZE(hx711_chan_spec),

The array_size.h inclusion should go with this patch.

> +};

...

>  	struct device *dev = &pdev->dev;
>  	struct hx711_data *hx711_data;
> +	const struct hx711_chip_info *chip_info;

Preserve reversed xmas tree order.

>  	struct iio_dev *indio_dev;
>  	int ret;
>  	int i;

...

> +	chip_info = device_get_match_data(dev);
> +	if (!chip_info)
> +		return dev_err_probe(dev, -ENODEV, "missing match data\n");

Since we are here, it's not match data, it's driver data. "missing driver data".

> +	hx711_data->chip_info = chip_info;

+ Blank line.

>  	/*

-- 
With Best Regards,
Andy Shevchenko