iio: frequency: cf_axi_dds: Support for chan spec via axidds_core_info

This adds support for providing an additional channel list via
struct axidds_core_info. This is in particular useful when
auto-generating the channel list from the HDL core synthesis parameter.
This additional list then allows to specify channels that can't
be known by this driver, such as channels of type IIO_TEMP, etc.

Signed-off-by: Michael Hennerich <[email protected]>

drivers/iio/frequency/cf_axi_dds.c

@@ -1746,6 +1746,8 @@ struct axidds_core_info {
 	unsigned int rate;
 	long info_mask_separate;
 	const char *name;
+	struct iio_chan_spec device_channels[AXIDDS_MAX_NUM_CHANNELS];
+	unsigned int num_device_channels;
 };
 
 static int cf_axi_dds_setup_chip_info_tbl(struct cf_axi_dds_state *st,
@@ -1830,9 +1832,18 @@ static int cf_axi_dds_setup_chip_info_tbl(struct cf_axi_dds_state *st,
 		}
 	}
 
+	st->chip_info_generated.num_dds_channels = i;
+
+	for (i = 0; i < info->num_device_channels; i++, c++) {
+		if (c > ARRAY_SIZE(st->chip_info_generated.channel))
+			return -EINVAL;
+		memcpy(&st->chip_info_generated.channel[c],
+			&info->device_channels[i],
+			sizeof(info->device_channels[0]));
+	}
+
 	st->chip_info_generated.num_channels = c;
 	st->chip_info_generated.num_dp_disable_channels = m;
-	st->chip_info_generated.num_dds_channels = i;
 	st->chip_info_generated.num_buf_channels = m;
 	st->chip_info_generated.name = info->name;
 
@@ -1875,6 +1886,17 @@ static const struct axidds_core_info ad9144_7_00_a_info = {
 	.version = ADI_AXI_PCORE_VER(9, 0, 'a'),
 	.rate = 1,
 	.issue_sync_en = 1,
+	.complex_modified = false,
+	.device_channels = {{
+		.type = IIO_TEMP,
+		.indexed = 1,
+		.channel = 0,
+		.scan_index = -1,
+		.info_mask_separate =
+			BIT(IIO_CHAN_INFO_PROCESSED) |
+			BIT(IIO_CHAN_INFO_CALIBBIAS),
+	}},
+	.num_device_channels = 1,
 };
 
 static const struct axidds_core_info ad9739a_8_00_b_info = {