[PATCH v3 04/14] iio: adc: adi-axi-adc: Add support for CRC
COLD43d
From: Janani Sunil <janani.sunil@analog.com>
Date: 2026-08-13 13:58:04
Also in:
linux-doc, linux-gpio, linux-iio, lkml
Subsystem:
analog devices inc iio drivers, iio subsystem and drivers, the rest · Maintainers:
Nuno Sá, Michael Hennerich, Jonathan Cameron, Linus Torvalds
Revision v3 of 5 in this series.
Revisions (5)
Add support for enabling and disabling Cyclic Redundancy Check (CRC) processing in the AXI ADC backend. CRC provides data integrity verification for high-speed ADC data streams, ensuring reliable data transfer between the ADC frontend and backend processing systems. Signed-off-by: Janani Sunil <janani.sunil@analog.com> --- drivers/iio/adc/adi-axi-adc.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+)
diff --git a/drivers/iio/adc/adi-axi-adc.c b/drivers/iio/adc/adi-axi-adc.c
index b5e59b1871b6..e8f149e230e7 100644
--- a/drivers/iio/adc/adi-axi-adc.c
+++ b/drivers/iio/adc/adi-axi-adc.c@@ -47,6 +47,9 @@ #define ADI_AXI_ADC_CTRL_DDR_EDGESEL_MASK BIT(1) #define ADI_AXI_ADC_REG_CNTRL_3 0x004c +/* Bit 8 is common to all AXI ADC cores; bits 7-0 are per-HDL-project. */ +#define ADI_AXI_ADC_CNTRL_3_CRC_EN_MASK BIT(8) + #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
@@ -567,6 +570,22 @@ static int axi_adc_reg_access(struct iio_backend *back, unsigned int reg, return regmap_write(st->regmap, reg, writeval); } +static int axi_adc_crc_enable(struct iio_backend *back) +{ + struct adi_axi_adc_state *st = iio_backend_get_priv(back); + + return regmap_set_bits(st->regmap, ADI_AXI_ADC_REG_CNTRL_3, + ADI_AXI_ADC_CNTRL_3_CRC_EN_MASK); +} + +static int axi_adc_crc_disable(struct iio_backend *back) +{ + struct adi_axi_adc_state *st = iio_backend_get_priv(back); + + return regmap_clear_bits(st->regmap, ADI_AXI_ADC_REG_CNTRL_3, + ADI_AXI_ADC_CNTRL_3_CRC_EN_MASK); +} + static const struct regmap_config axi_adc_regmap_config = { .val_bits = 32, .reg_bits = 32,
@@ -615,6 +634,8 @@ static const struct iio_backend_ops adi_axi_adc_ops = { .num_lanes_set = axi_adc_num_lanes_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), + .crc_enable = axi_adc_crc_enable, + .crc_disable = axi_adc_crc_disable, }; static const struct iio_backend_info adi_axi_adc_generic = {
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2.43.0