iio: dac: ad7303: use regulator get optional to check for ext supply

Previously, the code was using the of_read_property_bool() to check if
an external regulator was provided. However, this is redundant, as it's
more simple/direct to just ask the regulator is provided, via a
`devm_regulator_get_optional()` call.

Signed-off-by: Alexandru Tachici <alexandru.tachici@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/dac/ad7303.c b/drivers/iio/dac/ad7303.c
index 14bbac6..15af8a1 100644 (file)
--- a/drivers/iio/dac/ad7303.c
+++ b/drivers/iio/dac/ad7303.c
@@ -12,7 +12,6 @@
 #include <linux/slab.h>
 #include <linux/sysfs.h>
 #include <linux/regulator/consumer.h>
-#include <linux/of.h>
 
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
@@ -202,7 +201,6 @@ static int ad7303_probe(struct spi_device *spi)
        const struct spi_device_id *id = spi_get_device_id(spi);
        struct iio_dev *indio_dev;
        struct ad7303_state *st;
-       bool ext_ref;
        int ret;
 
        indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
@@ -224,24 +222,15 @@ static int ad7303_probe(struct spi_device *spi)
        if (ret)
                return ret;
 
-       if (spi->dev.of_node) {
-               ext_ref = of_property_read_bool(spi->dev.of_node,
-                               "REF-supply");
-       } else {
-               struct ad7303_platform_data *pdata = spi->dev.platform_data;
-               if (pdata && pdata->use_external_ref)
-                       ext_ref = true;
-               else
-                   ext_ref = false;
-       }
-
-       if (ext_ref) {
-               st->vref_reg = devm_regulator_get(&spi->dev, "REF");
-               if (IS_ERR(st->vref_reg)) {
-                       ret = PTR_ERR(st->vref_reg);
+       st->vref_reg = devm_regulator_get_optional(&spi->dev, "REF");
+       if (IS_ERR(st->vref_reg)) {
+               ret = PTR_ERR(st->vref_reg);
+               if (ret != -ENODEV)
                        goto err_disable_vdd_reg;
-               }
+               st->vref_reg = NULL;
+       }
 
+       if (st->vref_reg) {
                ret = regulator_enable(st->vref_reg);
                if (ret)
                        goto err_disable_vdd_reg;