On Fri, 2025-05-02 at 11:59 +0300, Antoniu Miclaus wrote:
> Add support for enabling/disabling filter based on the filter type
> provided.
>
> This feature is specific to the axi ad408x IP core, therefore add new
> compatible string and corresponding iio_backend_ops.
>
> Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
> ---
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
> changes in v4:
> - update commit message to state that the new compatible is added.
> - checking for max value is done in the iio_backend function.
> drivers/iio/adc/adi-axi-adc.c | 38 +++++++++++++++++++++++++++++++++++
> 1 file changed, 38 insertions(+)
>
> diff --git a/drivers/iio/adc/adi-axi-adc.c b/drivers/iio/adc/adi-axi-adc.c
> index 61ab7dce43be..2a3a6c3f5e59 100644
> --- a/drivers/iio/adc/adi-axi-adc.c
> +++ b/drivers/iio/adc/adi-axi-adc.c
> @@ -52,6 +52,7 @@
> #define AXI_AD485X_PACKET_FORMAT_20BIT 0x0
> #define AXI_AD485X_PACKET_FORMAT_24BIT 0x1
> #define AXI_AD485X_PACKET_FORMAT_32BIT 0x2
> +#define AXI_AD408X_CNTRL_3_FILTER_EN_MSK BIT(0)
>
> #define ADI_AXI_ADC_REG_DRP_STATUS 0x0074
> #define ADI_AXI_ADC_DRP_LOCKED BIT(17)
> @@ -402,6 +403,19 @@ static int axi_adc_ad485x_oversampling_ratio_set(struct
> iio_backend *back,
> }
> }
>
> +static int axi_adc_ad408x_filter_type_set(struct iio_backend *back,
> + enum iio_backend_filter_type type)
> +{
> + struct adi_axi_adc_state *st = iio_backend_get_priv(back);
> +
> + if (type)
> + return regmap_set_bits(st->regmap, ADI_AXI_ADC_REG_CNTRL_3,
> + AXI_AD408X_CNTRL_3_FILTER_EN_MSK);
> +
> + return regmap_clear_bits(st->regmap, ADI_AXI_ADC_REG_CNTRL_3,
> + AXI_AD408X_CNTRL_3_FILTER_EN_MSK);
> +}
> +
> static struct iio_buffer *axi_adc_request_buffer(struct iio_backend *back,
> struct iio_dev *indio_dev)
> {
> @@ -582,6 +596,24 @@ static const struct iio_backend_info axi_ad485x = {
> .ops = &adi_ad485x_ops,
> };
>
> +static const struct iio_backend_ops adi_ad408x_ops = {
> + .enable = axi_adc_enable,
> + .disable = axi_adc_disable,
> + .chan_enable = axi_adc_chan_enable,
> + .chan_disable = axi_adc_chan_disable,
> + .request_buffer = axi_adc_request_buffer,
> + .free_buffer = axi_adc_free_buffer,
> + .data_sample_trigger = axi_adc_data_sample_trigger,
> + .filter_type_set = axi_adc_ad408x_filter_type_set,
> + .debugfs_reg_access = iio_backend_debugfs_ptr(axi_adc_reg_access),
> + .debugfs_print_chan_status =
> iio_backend_debugfs_ptr(axi_adc_debugfs_print_chan_status),
> +};
> +
> +static const struct iio_backend_info axi_ad408x = {
> + .name = "axi-ad408x",
> + .ops = &adi_ad408x_ops,
> +};
> +
> static int adi_axi_adc_probe(struct platform_device *pdev)
> {
> struct adi_axi_adc_state *st;
> @@ -697,9 +729,15 @@ static const struct axi_adc_info adc_ad7606 = {
> .has_child_nodes = true,
> };
>
> +static const struct axi_adc_info adi_axi_ad408x = {
> + .version = ADI_AXI_PCORE_VER(10, 0, 'a'),
> + .backend_info = &axi_ad408x,
> +};
> +
> /* Match table for of_platform binding */
> static const struct of_device_id adi_axi_adc_of_match[] = {
> { .compatible = "adi,axi-adc-10.0.a", .data = &adc_generic },
> + { .compatible = "adi,axi-ad408x", .data = &adi_axi_ad408x },
> { .compatible = "adi,axi-ad485x", .data = &adi_axi_ad485x },
> { .compatible = "adi,axi-ad7606x", .data = &adc_ad7606 },
> { /* end of list */ }