staging: iio: ad7192: add DVdd regulator

The AD7190/AD7192/AD7193/AD7195 is supplied with two power sources:
AVdd as analog supply voltage and DVdd as digital supply voltage.

Attempt to fetch and enable the regulator 'dvdd'. Bail out if any error
occurs.

Suggested-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Eva Rachel Retuya <eraretuya@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/drivers/staging/iio/adc/ad7192.c b/drivers/staging/iio/adc/ad7192.c
index 29e32b7..3f8dc66 100644 (file)
--- a/drivers/staging/iio/adc/ad7192.c
+++ b/drivers/staging/iio/adc/ad7192.c
@@ -153,6 +153,7 @@
 
 struct ad7192_state {
        struct regulator                *reg;
+       struct regulator                *dvdd;
        u16                             int_vref_mv;
        u32                             mclk;
        u32                             f_order;
@@ -642,6 +643,19 @@ static int ad7192_probe(struct spi_device *spi)
                dev_err(&spi->dev, "Failed to enable specified AVdd supply\n");
                return ret;
        }
+
+       st->dvdd = devm_regulator_get(&spi->dev, "dvdd");
+       if (IS_ERR(st->dvdd)) {
+               ret = PTR_ERR(st->dvdd);
+               goto error_disable_reg;
+       }
+
+       ret = regulator_enable(st->dvdd);
+       if (ret) {
+               dev_err(&spi->dev, "Failed to enable specified DVdd supply\n");
+               goto error_disable_reg;
+       }
+
        voltage_uv = regulator_get_voltage(st->reg);
 
        if (pdata->vref_mv)
@@ -677,7 +691,7 @@ static int ad7192_probe(struct spi_device *spi)
 
        ret = ad_sd_setup_buffer_and_trigger(indio_dev);
        if (ret)
-               goto error_disable_reg;
+               goto error_disable_dvdd;
 
        ret = ad7192_setup(st, pdata);
        if (ret)
@@ -690,6 +704,8 @@ static int ad7192_probe(struct spi_device *spi)
 
 error_remove_trigger:
        ad_sd_cleanup_buffer_and_trigger(indio_dev);
+error_disable_dvdd:
+       regulator_disable(st->dvdd);
 error_disable_reg:
        regulator_disable(st->reg);
 
@@ -704,6 +720,7 @@ static int ad7192_remove(struct spi_device *spi)
        iio_device_unregister(indio_dev);
        ad_sd_cleanup_buffer_and_trigger(indio_dev);
 
+       regulator_disable(st->dvdd);
        regulator_disable(st->reg);
 
        return 0;