From: Rodrigo Alencar <[email protected]> Add RESET pin GPIO support through an optional reset control, which is local to the probe function. A reset pulse is manually generated after the device is powered up.
Signed-off-by: Rodrigo Alencar <[email protected]> --- drivers/iio/dac/ad5686.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/iio/dac/ad5686.c b/drivers/iio/dac/ad5686.c index e2ebabca6887..8ad8931a3d7f 100644 --- a/drivers/iio/dac/ad5686.c +++ b/drivers/iio/dac/ad5686.c @@ -15,6 +15,7 @@ #include <linux/kstrtox.h> #include <linux/module.h> #include <linux/regulator/consumer.h> +#include <linux/reset.h> #include <linux/sysfs.h> #include <linux/wordpart.h> @@ -472,6 +473,7 @@ int ad5686_probe(struct device *dev, const struct ad5686_chip_info *chip_info, const char *name, const struct ad5686_bus_ops *ops) { + struct reset_control *rstc; struct ad5686_state *st; struct iio_dev *indio_dev; int ret, i; @@ -486,6 +488,11 @@ int ad5686_probe(struct device *dev, st->ops = ops; st->chip_info = chip_info; + rstc = devm_reset_control_get_optional_exclusive(dev, NULL); + if (IS_ERR(rstc)) + return dev_err_probe(dev, PTR_ERR(rstc), + "Failed to get reset control\n"); + ret = devm_regulator_get_enable(dev, "vdd"); if (ret) return dev_err_probe(dev, ret, "failed to enable vdd supply\n"); @@ -509,6 +516,11 @@ int ad5686_probe(struct device *dev, /* 4.5us power-up time: Datasheet Table 4: Timing Characteristics */ fsleep(5); + /* 1us >> 30ns reset pulse activation time: Datasheet Table 4 */ + reset_control_assert(rstc); + fsleep(1); + reset_control_deassert(rstc); + /* Initialize masks to all ones */ st->pwr_down_mask = ~0; st->pwr_down_mode = ~0; -- 2.43.0
