diff options
Diffstat (limited to 'drivers/iio/dac/ad5758.c')
| -rw-r--r-- | drivers/iio/dac/ad5758.c | 26 |
1 files changed, 24 insertions, 2 deletions
diff --git a/drivers/iio/dac/ad5758.c b/drivers/iio/dac/ad5758.c index bd36333257af..ef41f12bf262 100644 --- a/drivers/iio/dac/ad5758.c +++ b/drivers/iio/dac/ad5758.c @@ -12,6 +12,7 @@ #include <linux/module.h> #include <linux/property.h> #include <linux/spi/spi.h> +#include <linux/gpio/consumer.h> #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> @@ -108,6 +109,7 @@ struct ad5758_range { struct ad5758_state { struct spi_device *spi; struct mutex lock; + struct gpio_desc *gpio_reset; struct ad5758_range out_range; unsigned int dc_dc_mode; unsigned int dc_dc_ilim; @@ -474,6 +476,21 @@ static int ad5758_internal_buffers_en(struct ad5758_state *st, bool enable) AD5758_CAL_MEM_UNREFRESHED_MSK); } +static int ad5758_reset(struct ad5758_state *st) +{ + if (st->gpio_reset) { + gpiod_set_value(st->gpio_reset, 0); + usleep_range(100, 1000); + gpiod_set_value(st->gpio_reset, 1); + usleep_range(100, 1000); + + return 0; + } else { + /* Perform a software reset */ + return ad5758_soft_reset(st); + } +} + static int ad5758_reg_access(struct iio_dev *indio_dev, unsigned int reg, unsigned int writeval, @@ -768,13 +785,18 @@ static int ad5758_init(struct ad5758_state *st) { int regval, ret; + st->gpio_reset = devm_gpiod_get_optional(&st->spi->dev, "reset", + GPIOD_OUT_HIGH); + if (IS_ERR(st->gpio_reset)) + return PTR_ERR(st->gpio_reset); + /* Disable CRC checks */ ret = ad5758_crc_disable(st); if (ret < 0) return ret; - /* Perform a software reset */ - ret = ad5758_soft_reset(st); + /* Perform a reset */ + ret = ad5758_reset(st); if (ret < 0) return ret; |