iio: adc: adi-axi-adc: add filter type config

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>
Link: https://patch.msgid.link/20250516082630.8236-6-antoniu.miclaus@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/adc/adi-axi-adc.c b/drivers/iio/adc/adi-axi-adc.c
index 4116c44197b8d03bcd62fa6328f21a55fc3e0da2..9531aa39faeee2efb240ae6fa742384697702849 100644 (file)
--- 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 },
        { }