Re: [PATCH v1 05/13] iio: dac: max5522: Simplify device abstraction

[Jonathan Cameron <jic23@kernel.org>]

On Fri, 19 Jun 2026 17:54:33 +0200
Uwe Kleine-König (The Capable Hub) <u.kleine-koenig@baylibre.com> wrote:

> The driver only supports a single chip variant since it's birth in 2022.
> Both the spi id_table and the of id_table are essentially unused (only
> assigned to a write-only member in private data).
> 
> Hardcode the device name and then drop various unused stuff from the
> driver. While touching the spi id_table assign .name using a named
> initializer.
> 
> Signed-off-by: Uwe Kleine-König (The Capable Hub) <u.kleine-koenig@baylibre.com>
Hmm. This one was a bit silly wasn't it? :)

Applied.

> ---
>  drivers/iio/dac/max5522.c | 31 +++----------------------------
>  1 file changed, 3 insertions(+), 28 deletions(-)
> 
> diff --git a/drivers/iio/dac/max5522.c b/drivers/iio/dac/max5522.c
> index b52a9cc1da79..cfbe3a6e0449 100644
> --- a/drivers/iio/dac/max5522.c
> +++ b/drivers/iio/dac/max5522.c
> @@ -25,15 +25,8 @@
>  
>  #define MAX5522_REG_DATA(x)	((x) + MAX5522_CTRL_LOAD_IN_A)
>  
> -struct max5522_chip_info {
> -	const char *name;
> -	const struct iio_chan_spec *channels;
> -	unsigned int num_channels;
> -};
> -
>  struct max5522_state {
>  	struct regmap *regmap;
> -	const struct max5522_chip_info *chip_info;
>  	unsigned short dac_cache[2];
>  	int vref_mV;
>  };
> @@ -58,18 +51,6 @@ static const struct iio_chan_spec max5522_channels[] = {
>  	MAX5522_CHANNEL(1),
>  };
>  
> -enum max5522_type {
> -	ID_MAX5522,
> -};
> -
> -static const struct max5522_chip_info max5522_chip_info_tbl[] = {
> -	[ID_MAX5522] = {
> -		.name = "max5522",
> -		.channels = max5522_channels,
> -		.num_channels = 2,
> -	},
> -};
> -
>  static inline int max5522_info_to_reg(struct iio_chan_spec const *chan)
>  {
>  	return MAX5522_REG_DATA(chan->channel);
> @@ -140,9 +121,6 @@ static int max5522_spi_probe(struct spi_device *spi)
>  	}
>  
>  	state = iio_priv(indio_dev);
> -	state->chip_info = spi_get_device_match_data(spi);
> -	if (!state->chip_info)
> -		return -EINVAL;
>  
>  	ret = devm_regulator_get_enable_read_voltage(&spi->dev, "vrefin");
>  	if (ret < 0)
> @@ -159,22 +137,19 @@ static int max5522_spi_probe(struct spi_device *spi)
>  	indio_dev->modes = INDIO_DIRECT_MODE;
>  	indio_dev->channels = max5522_channels;
>  	indio_dev->num_channels = ARRAY_SIZE(max5522_channels);
> -	indio_dev->name = max5522_chip_info_tbl[ID_MAX5522].name;
> +	indio_dev->name = "max5522";
>  
>  	return devm_iio_device_register(&spi->dev, indio_dev);
>  }
>  
>  static const struct spi_device_id max5522_ids[] = {
> -	{ "max5522", (kernel_ulong_t)&max5522_chip_info_tbl[ID_MAX5522] },
> +	{ .name = "max5522" },
>  	{ }
>  };
>  MODULE_DEVICE_TABLE(spi, max5522_ids);
>  
>  static const struct of_device_id max5522_of_match[] = {
> -	{
> -		.compatible = "maxim,max5522",
> -		.data = &max5522_chip_info_tbl[ID_MAX5522],
> -	},
> +	{ .compatible = "maxim,max5522" },
>  	{ }
>  };
>  MODULE_DEVICE_TABLE(of, max5522_of_match);