iio: adc: ad7173: fix num_slots

Fix the num_slots value for most chips in the ad7173 driver. The correct
value is the number of CHANNELx registers on the chip.

In commit 4310e15 ("iio: adc: ad7173: don't make copy of
ad_sigma_delta_info struct"), we refactored struct ad_sigma_delta_info
to be static const data instead of being dynamically populated during
driver probe. However, there was an existing bug in commit 76a1e6a
("iio: adc: ad7173: add AD7173 driver") where num_slots was incorrectly
set to the number of CONFIGx registers instead of the number of
CHANNELx registers. This bug was partially propagated to the refactored
code in that the 16-channel chips were only given 8 slots instead of
16 although we did managed to fix the 8-channel chips and one of the
4-channel chips in that commit. However, we botched two of the 4-channel
chips and ended up incorrectly giving them 8 slots during the
refactoring.

This patch fixes that mistake on the 4-channel chips and also
corrects the 16-channel chips to have 16 slots.

Fixes: 4310e15 ("iio: adc: ad7173: don't make copy of ad_sigma_delta_info struct")
Signed-off-by: David Lechner <dlechner@baylibre.com>
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Link: https://patch.msgid.link/20250706-iio-adc-ad7173-fix-num_slots-on-most-chips-v3-1-d1f5453198a7@baylibre.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Author: dlech

drivers/iio/adc/ad7173.c

@@ -771,10 +771,26 @@ static const struct ad_sigma_delta_info ad7173_sigma_delta_info_8_slots = {
 	.num_slots = 8,
 };
 
+static const struct ad_sigma_delta_info ad7173_sigma_delta_info_16_slots = {
+	.set_channel = ad7173_set_channel,
+	.append_status = ad7173_append_status,
+	.disable_all = ad7173_disable_all,
+	.disable_one = ad7173_disable_one,
+	.set_mode = ad7173_set_mode,
+	.has_registers = true,
+	.has_named_irqs = true,
+	.addr_shift = 0,
+	.read_mask = BIT(6),
+	.status_ch_mask = GENMASK(3, 0),
+	.data_reg = AD7173_REG_DATA,
+	.num_resetclks = 64,
+	.num_slots = 16,
+};
+
 static const struct ad7173_device_info ad4111_device_info = {
 	.name = "ad4111",
 	.id = AD4111_ID,
-	.sd_info = &ad7173_sigma_delta_info_8_slots,
+	.sd_info = &ad7173_sigma_delta_info_16_slots,
 	.num_voltage_in_div = 8,
 	.num_channels = 16,
 	.num_configs = 8,
@@ -796,7 +812,7 @@ static const struct ad7173_device_info ad4111_device_info = {
 static const struct ad7173_device_info ad4112_device_info = {
 	.name = "ad4112",
 	.id = AD4112_ID,
-	.sd_info = &ad7173_sigma_delta_info_8_slots,
+	.sd_info = &ad7173_sigma_delta_info_16_slots,
 	.num_voltage_in_div = 8,
 	.num_channels = 16,
 	.num_configs = 8,
@@ -817,7 +833,7 @@ static const struct ad7173_device_info ad4112_device_info = {
 static const struct ad7173_device_info ad4113_device_info = {
 	.name = "ad4113",
 	.id = AD4113_ID,
-	.sd_info = &ad7173_sigma_delta_info_8_slots,
+	.sd_info = &ad7173_sigma_delta_info_16_slots,
 	.num_voltage_in_div = 8,
 	.num_channels = 16,
 	.num_configs = 8,
@@ -836,7 +852,7 @@ static const struct ad7173_device_info ad4113_device_info = {
 static const struct ad7173_device_info ad4114_device_info = {
 	.name = "ad4114",
 	.id = AD4114_ID,
-	.sd_info = &ad7173_sigma_delta_info_8_slots,
+	.sd_info = &ad7173_sigma_delta_info_16_slots,
 	.num_voltage_in_div = 16,
 	.num_channels = 16,
 	.num_configs = 8,
@@ -855,7 +871,7 @@ static const struct ad7173_device_info ad4114_device_info = {
 static const struct ad7173_device_info ad4115_device_info = {
 	.name = "ad4115",
 	.id = AD4115_ID,
-	.sd_info = &ad7173_sigma_delta_info_8_slots,
+	.sd_info = &ad7173_sigma_delta_info_16_slots,
 	.num_voltage_in_div = 16,
 	.num_channels = 16,
 	.num_configs = 8,
@@ -874,7 +890,7 @@ static const struct ad7173_device_info ad4115_device_info = {
 static const struct ad7173_device_info ad4116_device_info = {
 	.name = "ad4116",
 	.id = AD4116_ID,
-	.sd_info = &ad7173_sigma_delta_info_8_slots,
+	.sd_info = &ad7173_sigma_delta_info_16_slots,
 	.num_voltage_in_div = 11,
 	.num_channels = 16,
 	.num_configs = 8,
@@ -893,7 +909,7 @@ static const struct ad7173_device_info ad4116_device_info = {
 static const struct ad7173_device_info ad7172_2_device_info = {
 	.name = "ad7172-2",
 	.id = AD7172_2_ID,
-	.sd_info = &ad7173_sigma_delta_info_8_slots,
+	.sd_info = &ad7173_sigma_delta_info_4_slots,
 	.num_voltage_in = 5,
 	.num_channels = 4,
 	.num_configs = 4,
@@ -926,7 +942,7 @@ static const struct ad7173_device_info ad7172_4_device_info = {
 static const struct ad7173_device_info ad7173_8_device_info = {
 	.name = "ad7173-8",
 	.id = AD7173_ID,
-	.sd_info = &ad7173_sigma_delta_info_8_slots,
+	.sd_info = &ad7173_sigma_delta_info_16_slots,
 	.num_voltage_in = 17,
 	.num_channels = 16,
 	.num_configs = 8,
@@ -943,7 +959,7 @@ static const struct ad7173_device_info ad7173_8_device_info = {
 static const struct ad7173_device_info ad7175_2_device_info = {
 	.name = "ad7175-2",
 	.id = AD7175_2_ID,
-	.sd_info = &ad7173_sigma_delta_info_8_slots,
+	.sd_info = &ad7173_sigma_delta_info_4_slots,
 	.num_voltage_in = 5,
 	.num_channels = 4,
 	.num_configs = 4,
@@ -960,7 +976,7 @@ static const struct ad7173_device_info ad7175_2_device_info = {
 static const struct ad7173_device_info ad7175_8_device_info = {
 	.name = "ad7175-8",
 	.id = AD7175_8_ID,
-	.sd_info = &ad7173_sigma_delta_info_8_slots,
+	.sd_info = &ad7173_sigma_delta_info_16_slots,
 	.num_voltage_in = 17,
 	.num_channels = 16,
 	.num_configs = 8,