[PATCH v7 5/8] iio: adc: adi-axi-adc: set data format

Antoniu Miclaus
2024-11-29T15:36:24Z

Add support for selecting the data format within the AXI ADC ip.

Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
---
changes in v7:
- add back 16-bit case
drivers/iio/adc/adi-axi-adc.c | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)

diff --git a/drivers/iio/adc/adi-axi-adc.c b/drivers/iio/adc/adi-axi-adc.c
index f6475bc93796..cb3b8299a65e 100644
--- a/drivers/iio/adc/adi-axi-adc.c
+++ b/drivers/iio/adc/adi-axi-adc.c
@@ -45,6 +45,12 @@
#define ADI_AXI_ADC_REG_CTRL 0x0044
#define ADI_AXI_ADC_CTRL_DDR_EDGESEL_MASK BIT(1)

+#define ADI_AXI_ADC_REG_CNTRL_3 0x004c
+#define AD485X_CNTRL_3_CUSTOM_CTRL_PACKET_FORMAT_MSK GENMASK(1, 0)
+#define AD485X_PACKET_FORMAT_20BIT 0x0
+#define AD485X_PACKET_FORMAT_24BIT 0x1
+#define AD485X_PACKET_FORMAT_32BIT 0x2
+
#define ADI_AXI_ADC_REG_DRP_STATUS 0x0074
#define ADI_AXI_ADC_DRP_LOCKED BIT(17)

@@ -312,6 +318,30 @@ static int axi_adc_interface_type_get(struct iio_backend *back,
return 0;
}

+static int axi_adc_data_size_set(struct iio_backend *back, unsigned int size)
+{
+ struct adi_axi_adc_state *st = iio_backend_get_priv(back);
+ unsigned int val;
+
+ switch (size) {
+ case 16:
+ case 20:
+ val = AD485X_PACKET_FORMAT_20BIT;
+ break;
+ case 24:
+ val = AD485X_PACKET_FORMAT_24BIT;
+ break;
+ case 32:
+ val = AD485X_PACKET_FORMAT_32BIT;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return regmap_update_bits(st->regmap, ADI_AXI_ADC_REG_CNTRL_3,
+ AD485X_CNTRL_3_CUSTOM_CTRL_PACKET_FORMAT_MSK, val);
+}
+
static struct iio_buffer *axi_adc_request_buffer(struct iio_backend *back,
struct iio_dev *indio_dev)
{
@@ -360,6 +390,7 @@ static const struct iio_backend_ops adi_axi_adc_ops = {
.test_pattern_set = axi_adc_test_pattern_set,
.chan_status = axi_adc_chan_status,
.interface_type_get = axi_adc_interface_type_get,
+ .data_size_set = axi_adc_data_size_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),
};
--
2.47.1