[PATCH 5/6] iio: adc: ad7380: fix supplies for ad7380-4

Julien Stephan
2024-10-07T15:45:49Z

ad7380-4 is the only device in the family that does not have an internal
reference. It uses "refin" as a required external reference.
All other devices in the family use "refio"" as an optional external
reference.

Fixes: 737413da8704 ("iio: adc: ad7380: add support for ad738x-4 4 channels variants")
Signed-off-by: Julien Stephan <jstephan@baylibre.com>
---
drivers/iio/adc/ad7380.c | 36 ++++++++++++++++++++++++++----------
1 file changed, 26 insertions(+), 10 deletions(-)

diff --git a/drivers/iio/adc/ad7380.c b/drivers/iio/adc/ad7380.c
index 9ef44b605144..e9784769baa9 100644
--- a/drivers/iio/adc/ad7380.c
+++ b/drivers/iio/adc/ad7380.c
@@ -89,6 +89,7 @@ struct ad7380_chip_info {
bool has_mux;
const char * const *supplies;
unsigned int num_supplies;
+ bool external_ref_only;
const char * const *vcm_supplies;
unsigned int num_vcm_supplies;
const unsigned long *available_scan_masks;
@@ -431,6 +432,7 @@ static const struct ad7380_chip_info ad7380_4_chip_info = {
.num_simult_channels = 4,
.supplies = ad7380_supplies,
.num_supplies = ARRAY_SIZE(ad7380_supplies),
+ .external_ref_only = true,
.available_scan_masks = ad7380_4_channel_scan_masks,
.timing_specs = &ad7380_4_timing,
};
@@ -1047,17 +1049,31 @@ static int ad7380_probe(struct spi_device *spi)
"Failed to enable power supplies\n");
msleep(T_POWERUP_MS);

- /*
- * If there is no REFIO supply, then it means that we are using
- * the internal 2.5V reference, otherwise REFIO is reference voltage.
- */
- ret = devm_regulator_get_enable_read_voltage(&spi->dev, "refio");
- if (ret < 0 && ret != -ENODEV)
- return dev_err_probe(&spi->dev, ret,
- "Failed to get refio regulator\n");
+ if (st->chip_info->external_ref_only) {
+ ret = devm_regulator_get_enable_read_voltage(&spi->dev,
+ "refin");
+ if (ret < 0)
+ return dev_err_probe(&spi->dev, ret,
+ "Failed to get refin regulator\n");
+
+ st->vref_mv = ret / 1000;

- external_ref_en = ret != -ENODEV;
- st->vref_mv = external_ref_en ? ret / 1000 : AD7380_INTERNAL_REF_MV;
+ /* these chips don't have a register bit for this */
+ external_ref_en = false;
+ } else {
+ /*
+ * If there is no REFIO supply, then it means that we are using
+ * the internal reference, otherwise REFIO is reference voltage.
+ */
+ ret = devm_regulator_get_enable_read_voltage(&spi->dev,
+ "refio");
+ if (ret < 0 && ret != -ENODEV)
+ return dev_err_probe(&spi->dev, ret,
+ "Failed to get refio regulator\n");
+
+ external_ref_en = ret != -ENODEV;
+ st->vref_mv = external_ref_en ? ret / 1000 : AD7380_INTERNAL_REF_MV;
+ }

if (st->chip_info->num_vcm_supplies > ARRAY_SIZE(st->vcm_mv))
return dev_err_probe(&spi->dev, -EINVAL,

--
2.46.0