Re: [PATCH v4 03/14] iio: backend: Add support for CRC

[David Lechner]

On 8/21/26 9:06 AM, Janani Sunil wrote:
> Add a backend operation to enable or disable direction-specific CRC
> handling. On input data paths, the backend handles CRC data generated by
> the frontend. On output data paths, the backend generates CRC data for
> the frontend to verify.
> 
> Signed-off-by: Janani Sunil <janani.sunil@xxxxxxxxxx>
> ---
>  drivers/iio/industrialio-backend.c | 33 +++++++++++++++++++++++++++++++++
>  include/linux/iio/backend.h        |  6 ++++++
>  2 files changed, 39 insertions(+)
> 
> diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-backend.c
> index f7a4be8ec320..fbf5c39d7655 100644
> --- a/drivers/iio/industrialio-backend.c
> +++ b/drivers/iio/industrialio-backend.c
> @@ -886,6 +886,39 @@ int iio_backend_num_lanes_set(struct iio_backend *back, unsigned int num_lanes)
>  }
>  EXPORT_SYMBOL_NS_GPL(iio_backend_num_lanes_set, "IIO_BACKEND");
>  
> +/**
> + * iio_backend_crc_enable - Enable CRC handling
> + * @back: Backend device
> + *
> + * On input data paths, enable backend handling of CRC data generated by the
> + * frontend. On output data paths, enable the backend to generate CRC data for
> + * the frontend to verify.
> + *
> + * RETURNS:
> + * 0 on success, negative error number on failure.
> + */
> +int iio_backend_crc_enable(struct iio_backend *back)
> +{
> +	return iio_backend_op_call(back, crc_enable);
> +}
> +EXPORT_SYMBOL_NS_GPL(iio_backend_crc_enable, "IIO_BACKEND");
> +
> +/**
> + * iio_backend_crc_disable - Disable CRC handling
> + * @back: Backend device
> + *
> + * On input data paths, disable backend handling of CRC data generated by the
> + * frontend. On output data paths, disable CRC generation by the backend.
> + *
> + * RETURNS:
> + * 0 on success, negative error number on failure.
> + */
> +int iio_backend_crc_disable(struct iio_backend *back)
> +{
> +	return iio_backend_op_call(back, crc_disable);
> +}
> +EXPORT_SYMBOL_NS_GPL(iio_backend_crc_disable, "IIO_BACKEND");
> +
The descriptions are a bit unclear on how the data is actually sent, so not
really sure all of the explanation is worth it vs. just saying enables/disables
CRC.

Good enough for me though:

Reviewed-by: David Lechner <dlechner@xxxxxxxxxxxx>