Commit 208a94c8 authored by Antoniu Miclaus's avatar Antoniu Miclaus Committed by Jonathan Cameron
Browse files

iio: adc: adi-axi-adc: add oversampling 



Add support for enabling/disabling oversampling.

Signed-off-by: default avatarAntoniu Miclaus <antoniu.miclaus@analog.com>
Link: https://patch.msgid.link/20250214131955.31973-8-antoniu.miclaus@analog.com


Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent 7a794e3a

drivers/iio/adc/adi-axi-adc.c

+24 −0
Original line number Diff line number Diff line
@@ -47,6 +47,7 @@ 
#define    ADI_AXI_ADC_CTRL_DDR_EDGESEL_MASK	BIT(1)



#define ADI_AXI_ADC_REG_CNTRL_3			0x004c

#define   AXI_AD485X_CNTRL_3_OS_EN_MSK		BIT(2)

#define   AXI_AD485X_CNTRL_3_PACKET_FORMAT_MSK	GENMASK(1, 0)

#define   AXI_AD485X_PACKET_FORMAT_20BIT	0x0

#define   AXI_AD485X_PACKET_FORMAT_24BIT	0x1
@@ -379,6 +380,28 @@ static int axi_adc_ad485x_data_size_set(struct iio_backend *back, 
				  FIELD_PREP(AXI_AD485X_CNTRL_3_PACKET_FORMAT_MSK, val));

}



static int axi_adc_ad485x_oversampling_ratio_set(struct iio_backend *back,

					  unsigned int ratio)

{

	struct adi_axi_adc_state *st = iio_backend_get_priv(back);



	/* The current state of the function enables or disables the

	 * oversampling in REG_CNTRL_3 register. A ratio equal to 1 implies no

	 * oversampling, while a value greater than 1 implies oversampling being

	 * enabled.

	 */

	switch (ratio) {

	case 0:

		return -EINVAL;

	case 1:

		return regmap_clear_bits(st->regmap, ADI_AXI_ADC_REG_CNTRL_3,

					 AXI_AD485X_CNTRL_3_OS_EN_MSK);

	default:

		return regmap_set_bits(st->regmap, ADI_AXI_ADC_REG_CNTRL_3,

				       AXI_AD485X_CNTRL_3_OS_EN_MSK);

	}

}



static struct iio_buffer *axi_adc_request_buffer(struct iio_backend *back,

						 struct iio_dev *indio_dev)

{
@@ -548,6 +571,7 @@ static const struct iio_backend_ops adi_ad485x_ops = { 
	.chan_status = axi_adc_chan_status,

	.interface_type_get = axi_adc_interface_type_get,

	.data_size_set = axi_adc_ad485x_data_size_set,

	.oversampling_ratio_set = axi_adc_ad485x_oversampling_ratio_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),