iio: dac: ad7293: enable power before reset

Change the order of regulator enable and reset so that power supplies
are turned on before touching the reset line. Generally, chips should
have the VDRIVE supply enabled before applying voltage on any pins.

While we are at it, remove the voltage level checks. If the power
supplies are not supplying the correct voltage, this is a hardware
design problem, not a software problem.

Signed-off-by: David Lechner <dlechner@baylibre.com>
Reviewed-by: Nuno Sa <nuno.sa@analog.com>
Link: https://patch.msgid.link/20241216-iio-regulator-cleanup-round-6-v2-1-9482164b68cb@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/dac/ad7293.c b/drivers/iio/dac/ad7293.c
index 1d403267048240be1bf3d8b2a59685409b9087fd..d3f49b5337d2f512363d50b434d99d4e9b95059f 100644 (file)
--- a/drivers/iio/dac/ad7293.c
+++ b/drivers/iio/dac/ad7293.c
@@ -141,8 +141,6 @@ struct ad7293_state {
        /* Protect against concurrent accesses to the device, page selection and data content */
        struct mutex lock;
        struct gpio_desc *gpio_reset;
-       struct regulator *reg_avdd;
-       struct regulator *reg_vdrive;
        u8 page_select;
        u8 data[3] __aligned(IIO_DMA_MINALIGN);
 };
@@ -777,6 +775,15 @@ static int ad7293_reset(struct ad7293_state *st)
 static int ad7293_properties_parse(struct ad7293_state *st)
 {
        struct spi_device *spi = st->spi;
+       int ret;
+
+       ret = devm_regulator_get_enable(&spi->dev, "avdd");
+       if (ret)
+               return dev_err_probe(&spi->dev, ret, "failed to enable AVDD\n");
+
+       ret = devm_regulator_get_enable(&spi->dev, "vdrive");
+       if (ret)
+               return dev_err_probe(&spi->dev, ret, "failed to enable VDRIVE\n");
 
        st->gpio_reset = devm_gpiod_get_optional(&st->spi->dev, "reset",
                                                 GPIOD_OUT_HIGH);
@@ -784,24 +791,9 @@ static int ad7293_properties_parse(struct ad7293_state *st)
                return dev_err_probe(&spi->dev, PTR_ERR(st->gpio_reset),
                                     "failed to get the reset GPIO\n");
 
-       st->reg_avdd = devm_regulator_get(&spi->dev, "avdd");
-       if (IS_ERR(st->reg_avdd))
-               return dev_err_probe(&spi->dev, PTR_ERR(st->reg_avdd),
-                                    "failed to get the AVDD voltage\n");
-
-       st->reg_vdrive = devm_regulator_get(&spi->dev, "vdrive");
-       if (IS_ERR(st->reg_vdrive))
-               return dev_err_probe(&spi->dev, PTR_ERR(st->reg_vdrive),
-                                    "failed to get the VDRIVE voltage\n");
-
        return 0;
 }
 
-static void ad7293_reg_disable(void *data)
-{
-       regulator_disable(data);
-}
-
 static int ad7293_init(struct ad7293_state *st)
 {
        int ret;
@@ -816,48 +808,6 @@ static int ad7293_init(struct ad7293_state *st)
        if (ret)
                return ret;
 
-       ret = regulator_enable(st->reg_avdd);
-       if (ret) {
-               dev_err(&spi->dev,
-                       "Failed to enable specified AVDD Voltage!\n");
-               return ret;
-       }
-
-       ret = devm_add_action_or_reset(&spi->dev, ad7293_reg_disable,
-                                      st->reg_avdd);
-       if (ret)
-               return ret;
-
-       ret = regulator_enable(st->reg_vdrive);
-       if (ret) {
-               dev_err(&spi->dev,
-                       "Failed to enable specified VDRIVE Voltage!\n");
-               return ret;
-       }
-
-       ret = devm_add_action_or_reset(&spi->dev, ad7293_reg_disable,
-                                      st->reg_vdrive);
-       if (ret)
-               return ret;
-
-       ret = regulator_get_voltage(st->reg_avdd);
-       if (ret < 0) {
-               dev_err(&spi->dev, "Failed to read avdd regulator: %d\n", ret);
-               return ret;
-       }
-
-       if (ret > 5500000 || ret < 4500000)
-               return -EINVAL;
-
-       ret = regulator_get_voltage(st->reg_vdrive);
-       if (ret < 0) {
-               dev_err(&spi->dev,
-                       "Failed to read vdrive regulator: %d\n", ret);
-               return ret;
-       }
-       if (ret > 5500000 || ret < 1700000)
-               return -EINVAL;
-
        /* Check Chip ID */
        ret = __ad7293_spi_read(st, AD7293_REG_DEVICE_ID, &chip_id);
        if (ret)