[PATCH v4 4/6] iio: adc: adi-axi-adc: set data format

[Antoniu Miclaus <antoniu.miclaus@analog.com>]

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

Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
---
changes in v4:
 - update indentation to match the rest of the driver.
 - shrink axi_adc_data_size_set in one line.
 drivers/iio/adc/adi-axi-adc.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/iio/adc/adi-axi-adc.c b/drivers/iio/adc/adi-axi-adc.c
index ff48f26e02a3..57e56dbccc9a 100644
--- a/drivers/iio/adc/adi-axi-adc.c
+++ b/drivers/iio/adc/adi-axi-adc.c
@@ -45,6 +45,9 @@
 #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   ADI_AXI_ADC_CNTRL_3_CUSTOM_CTRL_MSK	GENMASK(7, 0)
+
 #define ADI_AXI_ADC_REG_DRP_STATUS		0x0074
 #define   ADI_AXI_ADC_DRP_LOCKED		BIT(17)
 
@@ -271,6 +274,24 @@ static int axi_adc_interface_type_get(struct iio_backend *back,
 	return 0;
 }
 
+static int axi_adc_data_size_set(struct iio_backend *back, ssize_t size)
+{
+	struct adi_axi_adc_state *st = iio_backend_get_priv(back);
+	unsigned int val;
+
+	if (size <= 20)
+		val = 0;
+	else if (size <= 24)
+		val = 1;
+	else if (size <= 32)
+		val = 3;
+	else
+		return -EINVAL;
+
+	return regmap_update_bits(st->regmap, ADI_AXI_ADC_REG_CNTRL_3,
+				  ADI_AXI_ADC_CNTRL_3_CUSTOM_CONTROL_MSK, val);
+}
+
 static struct iio_buffer *axi_adc_request_buffer(struct iio_backend *back,
 						 struct iio_dev *indio_dev)
 {
@@ -308,6 +329,7 @@ static const struct iio_backend_ops adi_axi_adc_generic = {
 	.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,
 };
 
 static int adi_axi_adc_probe(struct platform_device *pdev)
-- 
2.46.2