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Fri, 13 Feb 2026 09:51:15 -0500 From: Antoniu Miclaus To: Antoniu Miclaus , Lars-Peter Clausen , Michael Hennerich , "Jonathan Cameron" , David Lechner , =?UTF-8?q?Nuno=20S=C3=A1?= , Andy Shevchenko , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Olivier Moysan , Mark Brown , , , , Subject: [PATCH v3 5/5] iio: adc: ad4080: add support for AD4880 dual-channel ADC Date: Fri, 13 Feb 2026 16:47:37 +0200 Message-ID: <20260213144742.16394-6-antoniu.miclaus@analog.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260213144742.16394-1-antoniu.miclaus@analog.com> References: <20260213144742.16394-1-antoniu.miclaus@analog.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ADIRuleOP-NewSCL: Rule Triggered X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMjEzMDExNSBTYWx0ZWRfXz8OHJp5lKL/P 4LA2x2w3Nit8Ij8Dq6Hbz8pPPzs2B78hs6oGDMibAq6TCcEbGzbewW9N/QDTmcfu1G2y1klGB1l pw5R8xAsmawyK8OsHcd/C/+wRZKcl6ZbsPqY2DACDj87umz7IyUCoxxC/JKog2x7x/tndUSi57K GfYh7vtFrStKof8roD1yedM8+Cd4ilInjUXfLquMo554O+343sbJbE/xIY3VuK/A2gvfK0FUPhh Xk1g17Z6uAlOUIkrVYMeKU/cN2ZLQxXpPnj6zyyybNoAI6GzdNkXewCqmyvFK/pvrLPyyetiPoy tpzQN7zt3kDMswa4NxjFzEo0jkW5g1Mke5+QmHhAeGBltGJUD31JHC6KAwaCBGKJuOcY2Aqlswy zVuaEckf+9tQFNxik9QUhPB53w2TybAWB17eOPfxF5ddVynXiitHWJTQrS/zX8mCG7jGAH4QbgN mfrGRUYwK1yo5SnWvGQ== X-Proofpoint-GUID: QYHH0fPcmgRggxNrvD-or22F20TYSuJo X-Proofpoint-ORIG-GUID: QYHH0fPcmgRggxNrvD-or22F20TYSuJo X-Authority-Analysis: v=2.4 cv=CPsnnBrD c=1 sm=1 tr=0 ts=698f3a6a cx=c_pps a=3WNzaoukacrqR9RwcOSAdA==:117 a=3WNzaoukacrqR9RwcOSAdA==:17 a=HzLeVaNsDn8A:10 a=VkNPw1HP01LnGYTKEx00:22 a=Mpw57Om8IfrbqaoTuvik:22 a=GgsMoib0sEa3-_RKJdDe:22 a=IpJZQVW2AAAA:8 a=gAnH3GRIAAAA:8 a=PfMWlQLGIS_dAahS8X8A:9 a=IawgGOuG5U0WyFbmm1f5:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-02-13_03,2026-02-12_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 suspectscore=0 bulkscore=0 priorityscore=1501 spamscore=0 malwarescore=0 adultscore=0 phishscore=0 clxscore=1015 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000 definitions=main-2602130115 Content-Type: text/plain; charset="utf-8" Add support for the AD4880, a dual-channel 20-bit 40MSPS SAR ADC with integrated fully differential amplifiers (FDA). The AD4880 has two independent ADC channels, each with its own SPI configuration interface. The driver uses spi_new_ancillary_device() to create an additional SPI device for the second channel, allowing both channels to share the same SPI bus with different chip selects. Reviewed-by: David Lechner Signed-off-by: Antoniu Miclaus Reviewed-by: Nuno S=C3=A1 --- Changes in v3: - Use devm_spi_new_ancillary_device() instead of manual spi_new_ancillary_device() + devm_add_action_or_reset() - Remove ad4080_unregister_ancillary() cleanup function - Generalize ancillary device setup with loop instead of hardcoding channel 1 drivers/iio/adc/ad4080.c | 248 +++++++++++++++++++++++++++++++-------- 1 file changed, 197 insertions(+), 51 deletions(-) diff --git a/drivers/iio/adc/ad4080.c b/drivers/iio/adc/ad4080.c index 7cf3b6ed7940..36a265ded80d 100644 --- a/drivers/iio/adc/ad4080.c +++ b/drivers/iio/adc/ad4080.c @@ -16,6 +16,7 @@ #include #include #include +#include #include #include #include @@ -131,6 +132,9 @@ #define AD4084_CHIP_ID 0x0054 #define AD4086_CHIP_ID 0x0056 #define AD4087_CHIP_ID 0x0057 +#define AD4880_CHIP_ID 0x0750 + +#define AD4080_MAX_CHANNELS 2 =20 #define AD4080_LVDS_CNV_CLK_CNT_MAX 7 =20 @@ -176,8 +180,9 @@ struct ad4080_chip_info { }; =20 struct ad4080_state { - struct regmap *regmap; - struct iio_backend *back; + struct spi_device *spi[AD4080_MAX_CHANNELS]; + struct regmap *regmap[AD4080_MAX_CHANNELS]; + struct iio_backend *back[AD4080_MAX_CHANNELS]; const struct ad4080_chip_info *info; /* * Synchronize access to members the of driver state, and ensure @@ -203,10 +208,11 @@ static int ad4080_reg_access(struct iio_dev *indio_de= v, unsigned int reg, { struct ad4080_state *st =3D iio_priv(indio_dev); =20 + /* Use channel 0 regmap for debugfs access */ if (readval) - return regmap_read(st->regmap, reg, readval); + return regmap_read(st->regmap[0], reg, readval); =20 - return regmap_write(st->regmap, reg, writeval); + return regmap_write(st->regmap[0], reg, writeval); } =20 static int ad4080_get_scale(struct ad4080_state *st, int *val, int *val2) @@ -227,8 +233,9 @@ static unsigned int ad4080_get_dec_rate(struct iio_dev = *dev, struct ad4080_state *st =3D iio_priv(dev); int ret; unsigned int data; + unsigned int ch =3D chan->channel; =20 - ret =3D regmap_read(st->regmap, AD4080_REG_FILTER_CONFIG, &data); + ret =3D regmap_read(st->regmap[ch], AD4080_REG_FILTER_CONFIG, &data); if (ret) return ret; =20 @@ -240,13 +247,14 @@ static int ad4080_set_dec_rate(struct iio_dev *dev, unsigned int mode) { struct ad4080_state *st =3D iio_priv(dev); + unsigned int ch =3D chan->channel; =20 guard(mutex)(&st->lock); =20 if ((st->filter_type >=3D SINC_5 && mode >=3D 512) || mode < 2) return -EINVAL; =20 - return regmap_update_bits(st->regmap, AD4080_REG_FILTER_CONFIG, + return regmap_update_bits(st->regmap[ch], AD4080_REG_FILTER_CONFIG, AD4080_FILTER_CONFIG_SINC_DEC_RATE_MSK, FIELD_PREP(AD4080_FILTER_CONFIG_SINC_DEC_RATE_MSK, (ilog2(mode) - 1))); @@ -304,23 +312,23 @@ static int ad4080_write_raw(struct iio_dev *indio_dev, } } =20 -static int ad4080_lvds_sync_write(struct ad4080_state *st) +static int ad4080_lvds_sync_write(struct ad4080_state *st, unsigned int ch) { - struct device *dev =3D regmap_get_device(st->regmap); + struct device *dev =3D regmap_get_device(st->regmap[ch]); int ret; =20 - ret =3D regmap_set_bits(st->regmap, AD4080_REG_ADC_DATA_INTF_CONFIG_A, + ret =3D regmap_set_bits(st->regmap[ch], AD4080_REG_ADC_DATA_INTF_CONFIG_A, AD4080_ADC_DATA_INTF_CONFIG_A_INTF_CHK_EN); if (ret) return ret; =20 - ret =3D iio_backend_interface_data_align(st->back, 10000); + ret =3D iio_backend_interface_data_align(st->back[ch], 10000); if (ret) return dev_err_probe(dev, ret, "Data alignment process failed\n"); =20 dev_dbg(dev, "Success: Pattern correct and Locked!\n"); - return regmap_clear_bits(st->regmap, AD4080_REG_ADC_DATA_INTF_CONFIG_A, + return regmap_clear_bits(st->regmap[ch], AD4080_REG_ADC_DATA_INTF_CONFIG_= A, AD4080_ADC_DATA_INTF_CONFIG_A_INTF_CHK_EN); } =20 @@ -329,9 +337,10 @@ static int ad4080_get_filter_type(struct iio_dev *dev, { struct ad4080_state *st =3D iio_priv(dev); unsigned int data; + unsigned int ch =3D chan->channel; int ret; =20 - ret =3D regmap_read(st->regmap, AD4080_REG_FILTER_CONFIG, &data); + ret =3D regmap_read(st->regmap[ch], AD4080_REG_FILTER_CONFIG, &data); if (ret) return ret; =20 @@ -343,6 +352,7 @@ static int ad4080_set_filter_type(struct iio_dev *dev, unsigned int mode) { struct ad4080_state *st =3D iio_priv(dev); + unsigned int ch =3D chan->channel; int dec_rate; int ret; =20 @@ -355,11 +365,11 @@ static int ad4080_set_filter_type(struct iio_dev *dev, if (mode >=3D SINC_5 && dec_rate >=3D 512) return -EINVAL; =20 - ret =3D iio_backend_filter_type_set(st->back, mode); + ret =3D iio_backend_filter_type_set(st->back[ch], mode); if (ret) return ret; =20 - ret =3D regmap_update_bits(st->regmap, AD4080_REG_FILTER_CONFIG, + ret =3D regmap_update_bits(st->regmap[ch], AD4080_REG_FILTER_CONFIG, AD4080_FILTER_CONFIG_FILTER_SEL_MSK, FIELD_PREP(AD4080_FILTER_CONFIG_FILTER_SEL_MSK, mode)); @@ -399,6 +409,29 @@ static int ad4080_read_avail(struct iio_dev *indio_dev, } } =20 +static int ad4880_update_scan_mode(struct iio_dev *indio_dev, + const unsigned long *scan_mask) +{ + struct ad4080_state *st =3D iio_priv(indio_dev); + unsigned int ch; + int ret; + + for (ch =3D 0; ch < st->info->num_channels; ch++) { + /* + * Each backend has a single channel (channel 0 from the + * backend's perspective), so always use channel index 0. + */ + if (test_bit(ch, scan_mask)) + ret =3D iio_backend_chan_enable(st->back[ch], 0); + else + ret =3D iio_backend_chan_disable(st->back[ch], 0); + if (ret) + return ret; + } + + return 0; +} + static const struct iio_info ad4080_iio_info =3D { .debugfs_reg_access =3D ad4080_reg_access, .read_raw =3D ad4080_read_raw, @@ -406,6 +439,19 @@ static const struct iio_info ad4080_iio_info =3D { .read_avail =3D ad4080_read_avail, }; =20 +/* + * AD4880 needs update_scan_mode to enable/disable individual backend chan= nels. + * Single-channel devices don't need this as their backends may not implem= ent + * chan_enable/chan_disable operations. + */ +static const struct iio_info ad4880_iio_info =3D { + .debugfs_reg_access =3D ad4080_reg_access, + .read_raw =3D ad4080_read_raw, + .write_raw =3D ad4080_write_raw, + .read_avail =3D ad4080_read_avail, + .update_scan_mode =3D ad4880_update_scan_mode, +}; + static const struct iio_enum ad4080_filter_type_enum =3D { .items =3D ad4080_filter_type_iio_enum, .num_items =3D ARRAY_SIZE(ad4080_filter_type_iio_enum), @@ -420,17 +466,51 @@ static struct iio_chan_spec_ext_info ad4080_ext_info[= ] =3D { { } }; =20 -#define AD4080_CHANNEL_DEFINE(bits, storage) { \ +/* + * AD4880 needs per-channel filter configuration since each channel has + * its own independent ADC with separate SPI interface. + */ +static struct iio_chan_spec_ext_info ad4880_ext_info[] =3D { + IIO_ENUM("filter_type", IIO_SEPARATE, &ad4080_filter_type_enum), + IIO_ENUM_AVAILABLE("filter_type", IIO_SEPARATE, + &ad4080_filter_type_enum), + { } +}; + +#define AD4080_CHANNEL_DEFINE(bits, storage, idx) { \ .type =3D IIO_VOLTAGE, \ .indexed =3D 1, \ - .channel =3D 0, \ + .channel =3D (idx), \ .info_mask_separate =3D BIT(IIO_CHAN_INFO_SCALE), \ .info_mask_shared_by_all =3D BIT(IIO_CHAN_INFO_SAMP_FREQ) | \ BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \ .info_mask_shared_by_all_available =3D \ BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \ .ext_info =3D ad4080_ext_info, \ - .scan_index =3D 0, \ + .scan_index =3D (idx), \ + .scan_type =3D { \ + .sign =3D 's', \ + .realbits =3D (bits), \ + .storagebits =3D (storage), \ + }, \ +} + +/* + * AD4880 has per-channel attributes (filter_type, oversampling_ratio, + * sampling_frequency) since each channel has its own independent ADC + * with separate SPI configuration interface. + */ +#define AD4880_CHANNEL_DEFINE(bits, storage, idx) { \ + .type =3D IIO_VOLTAGE, \ + .indexed =3D 1, \ + .channel =3D (idx), \ + .info_mask_separate =3D BIT(IIO_CHAN_INFO_SCALE) | \ + BIT(IIO_CHAN_INFO_SAMP_FREQ) | \ + BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \ + .info_mask_separate_available =3D \ + BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \ + .ext_info =3D ad4880_ext_info, \ + .scan_index =3D (idx), \ .scan_type =3D { \ .sign =3D 's', \ .realbits =3D (bits), \ @@ -438,17 +518,22 @@ static struct iio_chan_spec_ext_info ad4080_ext_info[= ] =3D { }, \ } =20 -static const struct iio_chan_spec ad4080_channel =3D AD4080_CHANNEL_DEFINE= (20, 32); +static const struct iio_chan_spec ad4080_channel =3D AD4080_CHANNEL_DEFINE= (20, 32, 0); =20 -static const struct iio_chan_spec ad4081_channel =3D AD4080_CHANNEL_DEFINE= (20, 32); +static const struct iio_chan_spec ad4081_channel =3D AD4080_CHANNEL_DEFINE= (20, 32, 0); =20 -static const struct iio_chan_spec ad4083_channel =3D AD4080_CHANNEL_DEFINE= (16, 16); +static const struct iio_chan_spec ad4083_channel =3D AD4080_CHANNEL_DEFINE= (16, 16, 0); =20 -static const struct iio_chan_spec ad4084_channel =3D AD4080_CHANNEL_DEFINE= (16, 16); +static const struct iio_chan_spec ad4084_channel =3D AD4080_CHANNEL_DEFINE= (16, 16, 0); =20 -static const struct iio_chan_spec ad4086_channel =3D AD4080_CHANNEL_DEFINE= (14, 16); +static const struct iio_chan_spec ad4086_channel =3D AD4080_CHANNEL_DEFINE= (14, 16, 0); =20 -static const struct iio_chan_spec ad4087_channel =3D AD4080_CHANNEL_DEFINE= (14, 16); +static const struct iio_chan_spec ad4087_channel =3D AD4080_CHANNEL_DEFINE= (14, 16, 0); + +static const struct iio_chan_spec ad4880_channels[] =3D { + AD4880_CHANNEL_DEFINE(20, 32, 0), + AD4880_CHANNEL_DEFINE(20, 32, 1), +}; =20 static const struct ad4080_chip_info ad4080_chip_info =3D { .name =3D "ad4080", @@ -510,25 +595,34 @@ static const struct ad4080_chip_info ad4087_chip_info= =3D { .lvds_cnv_clk_cnt_max =3D 1, }; =20 -static int ad4080_setup(struct iio_dev *indio_dev) +static const struct ad4080_chip_info ad4880_chip_info =3D { + .name =3D "ad4880", + .product_id =3D AD4880_CHIP_ID, + .scale_table =3D ad4080_scale_table, + .num_scales =3D ARRAY_SIZE(ad4080_scale_table), + .num_channels =3D 2, + .channels =3D ad4880_channels, + .lvds_cnv_clk_cnt_max =3D AD4080_LVDS_CNV_CLK_CNT_MAX, +}; + +static int ad4080_setup_channel(struct ad4080_state *st, unsigned int ch) { - struct ad4080_state *st =3D iio_priv(indio_dev); - struct device *dev =3D regmap_get_device(st->regmap); + struct device *dev =3D regmap_get_device(st->regmap[ch]); __le16 id_le; u16 id; int ret; =20 - ret =3D regmap_write(st->regmap, AD4080_REG_INTERFACE_CONFIG_A, + ret =3D regmap_write(st->regmap[ch], AD4080_REG_INTERFACE_CONFIG_A, AD4080_INTERFACE_CONFIG_A_SW_RESET); if (ret) return ret; =20 - ret =3D regmap_write(st->regmap, AD4080_REG_INTERFACE_CONFIG_A, + ret =3D regmap_write(st->regmap[ch], AD4080_REG_INTERFACE_CONFIG_A, AD4080_INTERFACE_CONFIG_A_SDO_ENABLE); if (ret) return ret; =20 - ret =3D regmap_bulk_read(st->regmap, AD4080_REG_PRODUCT_ID_L, &id_le, + ret =3D regmap_bulk_read(st->regmap[ch], AD4080_REG_PRODUCT_ID_L, &id_le, sizeof(id_le)); if (ret) return ret; @@ -537,18 +631,18 @@ static int ad4080_setup(struct iio_dev *indio_dev) if (id !=3D st->info->product_id) dev_info(dev, "Unrecognized CHIP_ID 0x%X\n", id); =20 - ret =3D regmap_set_bits(st->regmap, AD4080_REG_GPIO_CONFIG_A, + ret =3D regmap_set_bits(st->regmap[ch], AD4080_REG_GPIO_CONFIG_A, AD4080_GPIO_CONFIG_A_GPO_1_EN); if (ret) return ret; =20 - ret =3D regmap_write(st->regmap, AD4080_REG_GPIO_CONFIG_B, + ret =3D regmap_write(st->regmap[ch], AD4080_REG_GPIO_CONFIG_B, FIELD_PREP(AD4080_GPIO_CONFIG_B_GPIO_1_SEL_MSK, AD4080_GPIO_CONFIG_B_GPIO_FILTER_RES_RDY)); if (ret) return ret; =20 - ret =3D iio_backend_num_lanes_set(st->back, st->num_lanes); + ret =3D iio_backend_num_lanes_set(st->back[ch], st->num_lanes); if (ret) return ret; =20 @@ -556,7 +650,7 @@ static int ad4080_setup(struct iio_dev *indio_dev) return 0; =20 /* Set maximum LVDS Data Transfer Latency */ - ret =3D regmap_update_bits(st->regmap, + ret =3D regmap_update_bits(st->regmap[ch], AD4080_REG_ADC_DATA_INTF_CONFIG_B, AD4080_ADC_DATA_INTF_CONFIG_B_LVDS_CNV_CLK_CNT_MSK, FIELD_PREP(AD4080_ADC_DATA_INTF_CONFIG_B_LVDS_CNV_CLK_CNT_MSK, @@ -565,24 +659,39 @@ static int ad4080_setup(struct iio_dev *indio_dev) return ret; =20 if (st->num_lanes > 1) { - ret =3D regmap_set_bits(st->regmap, AD4080_REG_ADC_DATA_INTF_CONFIG_A, + ret =3D regmap_set_bits(st->regmap[ch], AD4080_REG_ADC_DATA_INTF_CONFIG_= A, AD4080_ADC_DATA_INTF_CONFIG_A_SPI_LVDS_LANES); if (ret) return ret; } =20 - ret =3D regmap_set_bits(st->regmap, + ret =3D regmap_set_bits(st->regmap[ch], AD4080_REG_ADC_DATA_INTF_CONFIG_B, AD4080_ADC_DATA_INTF_CONFIG_B_LVDS_CNV_EN); if (ret) return ret; =20 - return ad4080_lvds_sync_write(st); + return ad4080_lvds_sync_write(st, ch); +} + +static int ad4080_setup(struct iio_dev *indio_dev) +{ + struct ad4080_state *st =3D iio_priv(indio_dev); + unsigned int ch; + int ret; + + for (ch =3D 0; ch < st->info->num_channels; ch++) { + ret =3D ad4080_setup_channel(st, ch); + if (ret) + return ret; + } + + return 0; } =20 static int ad4080_properties_parse(struct ad4080_state *st) { - struct device *dev =3D regmap_get_device(st->regmap); + struct device *dev =3D regmap_get_device(st->regmap[0]); =20 st->lvds_cnv_en =3D device_property_read_bool(dev, "adi,lvds-cnv-enable"); =20 @@ -602,6 +711,7 @@ static int ad4080_probe(struct spi_device *spi) struct device *dev =3D &spi->dev; struct ad4080_state *st; struct clk *clk; + unsigned int ch; int ret; =20 indio_dev =3D devm_iio_device_alloc(&spi->dev, sizeof(*st)); @@ -610,6 +720,10 @@ static int ad4080_probe(struct spi_device *spi) =20 st =3D iio_priv(indio_dev); =20 + st->info =3D spi_get_device_match_data(spi); + if (!st->info) + return -ENODEV; + ret =3D devm_regulator_bulk_get_enable(dev, ARRAY_SIZE(ad4080_power_supplies), ad4080_power_supplies); @@ -617,13 +731,34 @@ static int ad4080_probe(struct spi_device *spi) return dev_err_probe(dev, ret, "failed to get and enable supplies\n"); =20 - st->regmap =3D devm_regmap_init_spi(spi, &ad4080_regmap_config); - if (IS_ERR(st->regmap)) - return PTR_ERR(st->regmap); + /* Setup primary SPI device (channel 0) */ + st->spi[0] =3D spi; + st->regmap[0] =3D devm_regmap_init_spi(spi, &ad4080_regmap_config); + if (IS_ERR(st->regmap[0])) + return PTR_ERR(st->regmap[0]); =20 - st->info =3D spi_get_device_match_data(spi); - if (!st->info) - return -ENODEV; + /* Setup ancillary SPI devices for additional channels */ + if (st->info->num_channels > 1) { + u32 reg[AD4080_MAX_CHANNELS]; + + ret =3D device_property_read_u32_array(dev, "reg", reg, + st->info->num_channels); + if (ret) + return dev_err_probe(dev, ret, + "missing reg entries for multi-channel device\n"); + + for (int i =3D 1; i < st->info->num_channels; i++) { + st->spi[i] =3D devm_spi_new_ancillary_device(spi, reg[i]); + if (IS_ERR(st->spi[i])) + return dev_err_probe(dev, PTR_ERR(st->spi[i]), + "failed to register ancillary device\n"); + + st->regmap[i] =3D devm_regmap_init_spi(st->spi[i], + &ad4080_regmap_config); + if (IS_ERR(st->regmap[i])) + return PTR_ERR(st->regmap[i]); + } + } =20 ret =3D devm_mutex_init(dev, &st->lock); if (ret) @@ -632,7 +767,8 @@ static int ad4080_probe(struct spi_device *spi) indio_dev->name =3D st->info->name; indio_dev->channels =3D st->info->channels; indio_dev->num_channels =3D st->info->num_channels; - indio_dev->info =3D &ad4080_iio_info; + indio_dev->info =3D st->info->num_channels > 1 ? + &ad4880_iio_info : &ad4080_iio_info; =20 ret =3D ad4080_properties_parse(st); if (ret) @@ -644,15 +780,23 @@ static int ad4080_probe(struct spi_device *spi) =20 st->clk_rate =3D clk_get_rate(clk); =20 - st->back =3D devm_iio_backend_get(dev, NULL); - if (IS_ERR(st->back)) - return PTR_ERR(st->back); + /* Get backends for all channels */ + for (ch =3D 0; ch < st->info->num_channels; ch++) { + st->back[ch] =3D devm_iio_backend_get_by_index(dev, ch); + if (IS_ERR(st->back[ch])) + return PTR_ERR(st->back[ch]); =20 - ret =3D devm_iio_backend_request_buffer(dev, st->back, indio_dev); - if (ret) - return ret; + ret =3D devm_iio_backend_enable(dev, st->back[ch]); + if (ret) + return ret; + } =20 - ret =3D devm_iio_backend_enable(dev, st->back); + /* + * Request buffer from the first backend only. For multi-channel + * devices (e.g., AD4880), all backends share a single IIO buffer + * as data from all ADC channels is interleaved into one stream. + */ + ret =3D devm_iio_backend_request_buffer(dev, st->back[0], indio_dev); if (ret) return ret; =20 @@ -670,6 +814,7 @@ static const struct spi_device_id ad4080_id[] =3D { { "ad4084", (kernel_ulong_t)&ad4084_chip_info }, { "ad4086", (kernel_ulong_t)&ad4086_chip_info }, { "ad4087", (kernel_ulong_t)&ad4087_chip_info }, + { "ad4880", (kernel_ulong_t)&ad4880_chip_info }, { } }; MODULE_DEVICE_TABLE(spi, ad4080_id); @@ -681,6 +826,7 @@ static const struct of_device_id ad4080_of_match[] =3D { { .compatible =3D "adi,ad4084", &ad4084_chip_info }, { .compatible =3D "adi,ad4086", &ad4086_chip_info }, { .compatible =3D "adi,ad4087", &ad4087_chip_info }, + { .compatible =3D "adi,ad4880", &ad4880_chip_info }, { } }; MODULE_DEVICE_TABLE(of, ad4080_of_match); --=20 2.43.0