Re: [PATCH v1 1/2] iio: adc: ti-adc128s052: add support for adc121s021

[David Lechner <dlechner@baylibre.com>]

On 6/25/25 12:02 PM, Lothar Rubusch wrote:
> Add support for the single channel variant(s) of this ADC.
> 
> Signed-off-by: Lothar Rubusch <l.rubusch@gmail.com>
> ---
>  drivers/iio/adc/ti-adc128s052.c | 17 ++++++++++++++++-
>  1 file changed, 16 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/iio/adc/ti-adc128s052.c b/drivers/iio/adc/ti-adc128s052.c
> index 1b46a8155803..cf271c39e663 100644
> --- a/drivers/iio/adc/ti-adc128s052.c
> +++ b/drivers/iio/adc/ti-adc128s052.c
> @@ -7,6 +7,7 @@
>   * https://www.ti.com/lit/ds/symlink/adc128s052.pdf
>   * https://www.ti.com/lit/ds/symlink/adc122s021.pdf
>   * https://www.ti.com/lit/ds/symlink/adc124s021.pdf
> + * https://www.ti.com/lit/ds/symlink/adc121s021.pdf
>   */
>  
>  #include <linux/cleanup.h>
> @@ -110,6 +111,10 @@ static const struct iio_chan_spec adc128s052_channels[] = {
>  	ADC128_VOLTAGE_CHANNEL(7),
>  };
>  
> +static const struct iio_chan_spec adc121s021_channels[] = {
> +	ADC128_VOLTAGE_CHANNEL(0),
> +};
> +
>  static const struct iio_chan_spec adc122s021_channels[] = {
>  	ADC128_VOLTAGE_CHANNEL(0),
>  	ADC128_VOLTAGE_CHANNEL(1),
> @@ -143,6 +148,10 @@ static const struct adc128_configuration adc128_config[] = {
>  		.refname = "vdd",
>  		.other_regulators = &bd79104_regulators,
>  		.num_other_regulators = 1,
> +	}, {
> +		.channels = adc121s021_channels,
> +		.num_channels = ARRAY_SIZE(adc121s021_channels),
> +		.refname = "vref",
>  	},


Let's try to keep these sorted rather than having rohm in the middle
of ti chips.

Same applies to the rest of the changes in this patch as well (other
than adc121s021_channels[] which look to be in a logical order already).


>  };
>  
> @@ -207,7 +216,10 @@ static const struct of_device_id adc128_of_match[] = {
>  	{ .compatible = "ti,adc124s051", .data = &adc128_config[2] },
>  	{ .compatible = "ti,adc124s101", .data = &adc128_config[2] },
>  	{ .compatible = "rohm,bd79104", .data = &adc128_config[3] },
> -	{ }
> +	{ .compatible = "ti,adc121s021", .data = &adc128_config[4] },
> +	{ .compatible = "ti,adc121s051", .data = &adc128_config[4] },
> +	{ .compatible = "ti,adc121s101", .data = &adc128_config[4] },

We'll need another patch to add these compatible strings to
Documentation/devicetree/bindings/iio/adc/ti,adc128s052.yaml

> +	{ },
>  };
>  MODULE_DEVICE_TABLE(of, adc128_of_match);
>  
> @@ -220,6 +232,9 @@ static const struct spi_device_id adc128_id[] = {
>  	{ "adc124s051", (kernel_ulong_t)&adc128_config[2] },
>  	{ "adc124s101", (kernel_ulong_t)&adc128_config[2] },
>  	{ "bd79104", (kernel_ulong_t)&adc128_config[3] },
> +	{ "adc121s021", (kernel_ulong_t)&adc128_config[4] },
> +	{ "adc121s051", (kernel_ulong_t)&adc128_config[4] },
> +	{ "adc121s101", (kernel_ulong_t)&adc128_config[4] },
>  	{ }
>  };
>  MODULE_DEVICE_TABLE(spi, adc128_id);