Re: [PATCH RFC v2 7/7] iio: ti-adc128s052: Drop variable vref

[David Lechner <dlechner@baylibre.com>]

On 4/2/25 1:10 AM, Matti Vaittinen wrote:
> According to Jonathan, variable reference voltages are very rare. It is
> unlikely it is needed, and supporting it makes the code a bit more
> complex.

There is also around 60 other drivers where we could do something like this
in case anyone is bored. :-p

> 
> Simplify the driver and drop the variable vref support.
> 
> Suggested-by: Jonathan Cameron <jic23@kernel.org>
> Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
> ---
> Revision History:
>  v2:
>   - New patch
> ---
>  drivers/iio/adc/ti-adc128s052.c | 29 ++++++-----------------------
>  1 file changed, 6 insertions(+), 23 deletions(-)
> 
> diff --git a/drivers/iio/adc/ti-adc128s052.c b/drivers/iio/adc/ti-adc128s052.c
> index 0f93c6266527..0bfe4e558c69 100644
> --- a/drivers/iio/adc/ti-adc128s052.c
> +++ b/drivers/iio/adc/ti-adc128s052.c
> @@ -29,13 +29,12 @@ struct adc128_configuration {
>  struct adc128 {
>  	struct spi_device *spi;
>  
> -	struct regulator *reg;
>  	/*
>  	 * Serialize the SPI 'write-channel + read data' accesses and protect
>  	 * the shared buffer.
>  	 */
>  	struct mutex lock;
> -
> +	int vref;

Units in the name are helpful: vref_uv.

Could also consider doing division in probe and storing vref_mv instead
since we never use the microvolts part.

>  	union {
>  		__be16 rx_buffer;
>  		u8 tx_buffer[2];