[PATCH v5 05/10] iio: adc: adi-axi-adc: add filter type config

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

Add support for enabling/disabling filter based on the filter type
provided.

This feature is specific to the axi ad408x IP core, therefore add new
compatible string and corresponding iio_backend_ops.

Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
---
no changes in v5.
 drivers/iio/adc/adi-axi-adc.c | 38 +++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/drivers/iio/adc/adi-axi-adc.c b/drivers/iio/adc/adi-axi-adc.c
index 61ab7dce43be..2a3a6c3f5e59 100644
--- a/drivers/iio/adc/adi-axi-adc.c
+++ b/drivers/iio/adc/adi-axi-adc.c
@@ -52,6 +52,7 @@
 #define   AXI_AD485X_PACKET_FORMAT_20BIT	0x0
 #define   AXI_AD485X_PACKET_FORMAT_24BIT	0x1
 #define   AXI_AD485X_PACKET_FORMAT_32BIT	0x2
+#define   AXI_AD408X_CNTRL_3_FILTER_EN_MSK	BIT(0)
 
 #define ADI_AXI_ADC_REG_DRP_STATUS		0x0074
 #define   ADI_AXI_ADC_DRP_LOCKED		BIT(17)
@@ -402,6 +403,19 @@ static int axi_adc_ad485x_oversampling_ratio_set(struct iio_backend *back,
 	}
 }
 
+static int axi_adc_ad408x_filter_type_set(struct iio_backend *back,
+					  enum iio_backend_filter_type type)
+{
+	struct adi_axi_adc_state *st = iio_backend_get_priv(back);
+
+	if (type)
+		return regmap_set_bits(st->regmap, ADI_AXI_ADC_REG_CNTRL_3,
+				       AXI_AD408X_CNTRL_3_FILTER_EN_MSK);
+
+	return regmap_clear_bits(st->regmap, ADI_AXI_ADC_REG_CNTRL_3,
+				 AXI_AD408X_CNTRL_3_FILTER_EN_MSK);
+}
+
 static struct iio_buffer *axi_adc_request_buffer(struct iio_backend *back,
 						 struct iio_dev *indio_dev)
 {
@@ -582,6 +596,24 @@ static const struct iio_backend_info axi_ad485x = {
 	.ops = &adi_ad485x_ops,
 };
 
+static const struct iio_backend_ops adi_ad408x_ops = {
+	.enable = axi_adc_enable,
+	.disable = axi_adc_disable,
+	.chan_enable = axi_adc_chan_enable,
+	.chan_disable = axi_adc_chan_disable,
+	.request_buffer = axi_adc_request_buffer,
+	.free_buffer = axi_adc_free_buffer,
+	.data_sample_trigger = axi_adc_data_sample_trigger,
+	.filter_type_set = axi_adc_ad408x_filter_type_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),
+};
+
+static const struct iio_backend_info axi_ad408x = {
+	.name = "axi-ad408x",
+	.ops = &adi_ad408x_ops,
+};
+
 static int adi_axi_adc_probe(struct platform_device *pdev)
 {
 	struct adi_axi_adc_state *st;
@@ -697,9 +729,15 @@ static const struct axi_adc_info adc_ad7606 = {
 	.has_child_nodes = true,
 };
 
+static const struct axi_adc_info adi_axi_ad408x = {
+	.version = ADI_AXI_PCORE_VER(10, 0, 'a'),
+	.backend_info = &axi_ad408x,
+};
+
 /* Match table for of_platform binding */
 static const struct of_device_id adi_axi_adc_of_match[] = {
 	{ .compatible = "adi,axi-adc-10.0.a", .data = &adc_generic },
+	{ .compatible = "adi,axi-ad408x", .data = &adi_axi_ad408x },
 	{ .compatible = "adi,axi-ad485x", .data = &adi_axi_ad485x },
 	{ .compatible = "adi,axi-ad7606x", .data = &adc_ad7606 },
 	{ /* end of list */ }
-- 
2.49.0