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authorMichael Hennerich <michael.hennerich@analog.com>2018-07-27 09:41:09 +0300
committerJonathan Cameron <Jonathan.Cameron@huawei.com>2018-07-28 12:41:14 +0300
commit6431975789fc3c480cb6344256f72d85889df3b2 (patch)
treea88121f6b0666eca7030947709d48f5cb5636a99 /drivers/iio
parent6d4abf1c0e265d8e99c155b91c1cf44e37793e53 (diff)
downloadlinux-6431975789fc3c480cb6344256f72d85889df3b2.tar.xz
iio: ad9523: support for external signals via gpios
The AD9523 supports external signals for power-down mode, resetting the device and sync timing. This change add support for specifying values for these signals via the gpios and initializing them default values. For the reset signal, the GPIO is toggled during probing to re-initialize the device to a known state. Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/iio')
-rw-r--r--drivers/iio/frequency/ad9523.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/iio/frequency/ad9523.c b/drivers/iio/frequency/ad9523.c
index 37504739c277..38a8f73bd8d9 100644
--- a/drivers/iio/frequency/ad9523.c
+++ b/drivers/iio/frequency/ad9523.c
@@ -12,6 +12,7 @@
#include <linux/sysfs.h>
#include <linux/spi/spi.h>
#include <linux/regulator/consumer.h>
+#include <linux/gpio/consumer.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/delay.h>
@@ -268,6 +269,9 @@ struct ad9523_state {
struct regulator *reg;
struct ad9523_platform_data *pdata;
struct iio_chan_spec ad9523_channels[AD9523_NUM_CHAN];
+ struct gpio_desc *pwrdown_gpio;
+ struct gpio_desc *reset_gpio;
+ struct gpio_desc *sync_gpio;
unsigned long vcxo_freq;
unsigned long vco_freq;
@@ -988,6 +992,32 @@ static int ad9523_probe(struct spi_device *spi)
return ret;
}
+ st->pwrdown_gpio = devm_gpiod_get_optional(&spi->dev, "powerdown",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(st->pwrdown_gpio)) {
+ ret = PTR_ERR(st->pwrdown_gpio);
+ goto error_disable_reg;
+ }
+
+ st->reset_gpio = devm_gpiod_get_optional(&spi->dev, "reset",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(st->reset_gpio)) {
+ ret = PTR_ERR(st->reset_gpio);
+ goto error_disable_reg;
+ }
+
+ if (st->reset_gpio) {
+ udelay(1);
+ gpiod_direction_output(st->reset_gpio, 1);
+ }
+
+ st->sync_gpio = devm_gpiod_get_optional(&spi->dev, "sync",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(st->sync_gpio)) {
+ ret = PTR_ERR(st->sync_gpio);
+ goto error_disable_reg;
+ }
+
spi_set_drvdata(spi, indio_dev);
st->spi = spi;
st->pdata = pdata;