On Fri, 2025-05-02 at 11:59 +0300, Antoniu Miclaus wrote:
> Add support for starting the sync process used for data
> capture alignment.
>
> Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
> ---
> changes in v4:
> - rework data_align function.
> - rename bit definitions/functions.
> drivers/iio/adc/adi-axi-adc.c | 37 +++++++++++++++++++++++++++++++++++
> 1 file changed, 37 insertions(+)
>
> diff --git a/drivers/iio/adc/adi-axi-adc.c b/drivers/iio/adc/adi-axi-adc.c
> index 2a3a6c3f5e59..2a79c043c0de 100644
> --- a/drivers/iio/adc/adi-axi-adc.c
> +++ b/drivers/iio/adc/adi-axi-adc.c
> @@ -44,6 +44,7 @@
> #define ADI_AXI_ADC_REG_CONFIG_CMOS_OR_LVDS_N BIT(7)
>
> #define ADI_AXI_ADC_REG_CTRL 0x0044
> +#define ADI_AXI_ADC_CTRL_SYNC_MSK BIT(3)
> #define ADI_AXI_ADC_CTRL_DDR_EDGESEL_MASK BIT(1)
>
> #define ADI_AXI_ADC_REG_CNTRL_3 0x004c
> @@ -54,6 +55,9 @@
> #define AXI_AD485X_PACKET_FORMAT_32BIT 0x2
> #define AXI_AD408X_CNTRL_3_FILTER_EN_MSK BIT(0)
>
> +#define ADI_AXI_ADC_REG_SYNC_STATUS 0x0068
> +#define ADI_AXI_ADC_SYNC_STATUS_ADC_SYNC_MSK BIT(0)
> +
> #define ADI_AXI_ADC_REG_DRP_STATUS 0x0074
> #define ADI_AXI_ADC_DRP_LOCKED BIT(17)
>
> @@ -416,6 +420,38 @@ static int axi_adc_ad408x_filter_type_set(struct
> iio_backend *back,
> AXI_AD408X_CNTRL_3_FILTER_EN_MSK);
> }
>
> +static int axi_adc_ad408x_interface_data_align(struct iio_backend *back,
> + u32 timeout)
> +{
> + struct adi_axi_adc_state *st = iio_backend_get_priv(back);
> + bool sync_en;
> + u32 val;
> + int ret;
> +
> + ret = regmap_set_bits(st->regmap, ADI_AXI_ADC_REG_CTRL,
> + ADI_AXI_ADC_CTRL_SYNC_MSK);
> + if (ret)
> + return ret;
> +
> + do {
> + ret = regmap_read(st->regmap, ADI_AXI_ADC_REG_SYNC_STATUS,
> &val);
> + if (ret)
> + return ret;
> +
> + sync_en = FIELD_GET(ADI_AXI_ADC_SYNC_STATUS_ADC_SYNC_MSK,
> val);
> +
> + if (!sync_en)
> + dev_dbg(st->dev, "Not Locked: Running Bit Slip\n");
> +
> + fsleep(500);
> + } while (--timeout && !sync_en);
Why not regmap_read_poll_timeout()?
- Nuno Sá
> +
> + if (!timeout)
> + return -ETIMEDOUT;
> +
> + return 0;
> +}
> +
> static struct iio_buffer *axi_adc_request_buffer(struct iio_backend *back,
> struct iio_dev *indio_dev)
> {
> @@ -605,6 +641,7 @@ static const struct iio_backend_ops adi_ad408x_ops = {
> .free_buffer = axi_adc_free_buffer,
> .data_sample_trigger = axi_adc_data_sample_trigger,
> .filter_type_set = axi_adc_ad408x_filter_type_set,
> + .interface_data_align = axi_adc_ad408x_interface_data_align,
> .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),
> };