From: Antoniu Miclaus Date: Fri, 14 Feb 2025 13:19:53 +0000 (+0200) Subject: iio: adc: adi-axi-adc: add oversampling X-Git-Tag: v6.15-rc1~78^2~8^2~139 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=208a94c8884d3a0525807d798883f568135db604;p=thirdparty%2Fkernel%2Flinux.git iio: adc: adi-axi-adc: add oversampling Add support for enabling/disabling oversampling. Signed-off-by: Antoniu Miclaus Link: https://patch.msgid.link/20250214131955.31973-8-antoniu.miclaus@analog.com Signed-off-by: Jonathan Cameron --- diff --git a/drivers/iio/adc/adi-axi-adc.c b/drivers/iio/adc/adi-axi-adc.c index ed6a46bdbd808..61ab7dce43be6 100644 --- a/drivers/iio/adc/adi-axi-adc.c +++ b/drivers/iio/adc/adi-axi-adc.c @@ -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),