iio: dac: ad3552r: use devm_regulator_get_enable_read_voltage()

Use devm_regulator_get_enable_read_voltage() to simplify the code.
Error message is slightly changed since there is only one error return
now.

Signed-off-by: David Lechner <dlechner@baylibre.com>
Reviewed-by: Nuno Sa <nuno.sa@analog.com>
Link: https://patch.msgid.link/20240621-iio-regulator-refactor-round-2-v1-10-49e50cd0b99a@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/dac/ad3552r.c b/drivers/iio/dac/ad3552r.c
index ddc6c262f801a675dd871bd7bf78ebdcca4f1a36..bd37d304ca70ac82c323d56ed7edbb7702d1179f 100644 (file)
--- a/drivers/iio/dac/ad3552r.c
+++ b/drivers/iio/dac/ad3552r.c
@@ -857,15 +857,9 @@ static int ad3552r_configure_custom_gain(struct ad3552r_desc *dac,
        return 0;
 }
 
-static void ad3552r_reg_disable(void *reg)
-{
-       regulator_disable(reg);
-}
-
 static int ad3552r_configure_device(struct ad3552r_desc *dac)
 {
        struct device *dev = &dac->spi->dev;
-       struct regulator *vref;
        int err, cnt = 0, voltage, delta = 100000;
        u32 vals[2], val, ch;
 
@@ -874,30 +868,16 @@ static int ad3552r_configure_device(struct ad3552r_desc *dac)
                return dev_err_probe(dev, PTR_ERR(dac->gpio_ldac),
                                     "Error getting gpio ldac");
 
-       vref = devm_regulator_get_optional(dev, "vref");
-       if (IS_ERR(vref)) {
-               if (PTR_ERR(vref) != -ENODEV)
-                       return dev_err_probe(dev, PTR_ERR(vref),
-                                            "Error getting vref");
+       voltage = devm_regulator_get_enable_read_voltage(dev, "vref");
+       if (voltage < 0 && voltage != -ENODEV)
+               return dev_err_probe(dev, voltage, "Error getting vref voltage\n");
 
+       if (voltage == -ENODEV) {
                if (device_property_read_bool(dev, "adi,vref-out-en"))
                        val = AD3552R_INTERNAL_VREF_PIN_2P5V;
                else
                        val = AD3552R_INTERNAL_VREF_PIN_FLOATING;
        } else {
-               err = regulator_enable(vref);
-               if (err) {
-                       dev_err(dev, "Failed to enable external vref supply\n");
-                       return err;
-               }
-
-               err = devm_add_action_or_reset(dev, ad3552r_reg_disable, vref);
-               if (err) {
-                       regulator_disable(vref);
-                       return err;
-               }
-
-               voltage = regulator_get_voltage(vref);
                if (voltage > 2500000 + delta || voltage < 2500000 - delta) {
                        dev_warn(dev, "vref-supply must be 2.5V");
                        return -EINVAL;