Re: [PATCH v3 3/6] spi: expand device name to include all CS lines for multi-CS devices

[Andy Shevchenko]

On Mon, Aug 17, 2026 at 08:32:57PM -0300, Jonathan Santos wrote:
> The device name for SPI devices was formatted as <controller>.<cs0>,
> always using only the first chip-select index, ignoring the remaining CS
> lines.
> 
> Change the naming format to <controller>.<cs0>+<cs1>+... so that all
> active chip-selects are reflected in the device name. Single-CS devices
> are not affected since the loop only appends extra indices when
> num_chipselect is greater than one.

...

> -	dev_set_name(&spi->dev, "%s.%u", dev_name(&spi->controller->dev),
> -		     spi_get_chipselect(spi, 0));
> +	cs_len = scnprintf(cs_str, sizeof(cs_str), "%u", spi_get_chipselect(spi, 0));
> +	for (unsigned int idx = 1; idx < spi->num_chipselect; idx++)
> +		cs_len += scnprintf(cs_str + cs_len, sizeof(cs_str) - cs_len,
> +				    "+%u", spi_get_chipselect(spi, idx));

So, if this won't support sparse CS list, I would just go with a standard range:

	dev_set_name(&spi->dev, "%s.%u-%u", dev_name(&spi->controller->dev),
		     spi_get_chipselect(spi, 0), spi_get_chipselect(spi, 0) + spi->num_chipselect - 1);

(yes, need a variation for num_chipselect == 1, but I leave the rest for you)

Note, I do not see that we are expecting to see the sparse CS list here. It
would make too complex logic to follow. So, range approach is KISS in my opinion.

-- 
With Best Regards,
Andy Shevchenko