5.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Alisa-Dariana Roman <alisa.roman@xxxxxxxxxx>
[ Upstream commit 7e7dcab620cd6d34939f615cac63fc0ef7e81c72 ]
The avdd and the reference voltage are two different sources but the
reference voltage was assigned according to the avdd supply.
Add vref regulator structure and set the reference voltage according to
the vref supply from the devicetree.
In case vref supply is missing, reference voltage is set according to
the avdd supply for compatibility with old devicetrees.
Fixes: b581f748cce0 ("staging: iio: adc: ad7192: move out of staging")
Signed-off-by: Alisa-Dariana Roman <alisa.roman@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20230924152149.41884-1-alisadariana@xxxxxxxxx
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/iio/adc/ad7192.c | 29 +++++++++++++++++++++++++----
1 file changed, 25 insertions(+), 4 deletions(-)
diff --git a/drivers/iio/adc/ad7192.c b/drivers/iio/adc/ad7192.c
index 6df435e3c4218..31461d46c5941 100644
--- a/drivers/iio/adc/ad7192.c
+++ b/drivers/iio/adc/ad7192.c
@@ -177,6 +177,7 @@ struct ad7192_state {
const struct ad7192_chip_info *chip_info;
struct regulator *avdd;
struct regulator *dvdd;
+ struct regulator *vref;
struct clk *mclk;
u16 int_vref_mv;
u32 fclk;
@@ -962,10 +963,30 @@ static int ad7192_probe(struct spi_device *spi)
if (ret)
return ret;
- ret = regulator_get_voltage(st->avdd);
- if (ret < 0) {
- dev_err(&spi->dev, "Device tree error, reference voltage undefined\n");
- return ret;
+ st->vref = devm_regulator_get_optional(&spi->dev, "vref");
+ if (IS_ERR(st->vref)) {
+ if (PTR_ERR(st->vref) != -ENODEV)
+ return PTR_ERR(st->vref);
+
+ ret = regulator_get_voltage(st->avdd);
+ if (ret < 0)
+ return dev_err_probe(&spi->dev, ret,
+ "Device tree error, AVdd voltage undefined\n");
+ } else {
+ ret = regulator_enable(st->vref);
+ if (ret) {
+ dev_err(&spi->dev, "Failed to enable specified Vref supply\n");
+ return ret;
+ }
+
+ ret = devm_add_action_or_reset(&spi->dev, ad7192_reg_disable, st->vref);
+ if (ret)
+ return ret;
+
+ ret = regulator_get_voltage(st->vref);
+ if (ret < 0)
+ return dev_err_probe(&spi->dev, ret,
+ "Device tree error, Vref voltage undefined\n");
}
st->int_vref_mv = ret / 1000;
--
2.40.1
