iio: adc: ad799x: add reference voltage to ad7994

AD7994 supports external reference voltage on REFIN
pin so if a vref-supply has been defined it shall be
used.

Signed-off-by: Stefano Manni <stefano.manni@gmail.com>
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Reviewed-by: David Lechner <dlechner@baylibre.com>
Link: https://patch.msgid.link/20250807074850.130831-3-stefano.manni@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/adc/ad799x.c b/drivers/iio/adc/ad799x.c
index f645995b09297321e8fb506d1e2d46dc69032d20..108bb22162ef18246a031c170bbcac1de1ade989 100644 (file)
--- a/drivers/iio/adc/ad799x.c
+++ b/drivers/iio/adc/ad799x.c
@@ -692,6 +692,7 @@ static const struct ad799x_chip_info ad799x_chip_info_tbl[] = {
        },
        [ad7994] = {
                .num_channels = 5,
+               .has_vref = true,
                .noirq_config = {
                        .channel = {
                                AD799X_CHANNEL(0, 12),