[PATCH v6 04/17] iio: adc: adi-axi-adc: Add support for CRC
From: Janani Sunil <janani.sunil@analog.com>
Date: 2026-09-04 14:16:08
Also in:
linux-devicetree, 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
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. Reviewed-by: David Lechner <dlechner@baylibre.com> 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 fc7cc92b35f0..8b7c45d51dbe 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
@@ -596,6 +599,22 @@ 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,
@@ -644,6 +663,8 @@ 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 = {
--
2.43.0