[PATCH v4 03/15] iio: adc: ad7091r: Set alert bit in config register

[Marcelo Schmitt <marcelo.schmitt@analog.com>]

The ad7091r-base driver sets up an interrupt handler for firing events
when inputs are either above or below a certain threshold.
However, for the interrupt signal to come from the device it must be
configured to enable the ALERT/BUSY/GPO pin to be used as ALERT, which
was not being done until now.
Enable interrupt signals on the ALERT/BUSY/GPO pin by setting the proper
bit in the configuration register.

Signed-off-by: Marcelo Schmitt <marcelo.schmitt@analog.com>
---
 drivers/iio/adc/ad7091r-base.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/iio/adc/ad7091r-base.c b/drivers/iio/adc/ad7091r-base.c
index 0e5d3d2e9c98..8aaa854f816f 100644
--- a/drivers/iio/adc/ad7091r-base.c
+++ b/drivers/iio/adc/ad7091r-base.c
@@ -28,6 +28,7 @@
 #define AD7091R_REG_RESULT_CONV_RESULT(x)   ((x) & 0xfff)
 
 /* AD7091R_REG_CONF */
+#define AD7091R_REG_CONF_ALERT_EN   BIT(4)
 #define AD7091R_REG_CONF_AUTO   BIT(8)
 #define AD7091R_REG_CONF_CMD    BIT(10)
 
@@ -232,6 +233,11 @@ int ad7091r_probe(struct device *dev, const char *name,
 	iio_dev->channels = chip_info->channels;
 
 	if (irq) {
+		ret = regmap_update_bits(st->map, AD7091R_REG_CONF,
+					 AD7091R_REG_CONF_ALERT_EN, BIT(4));
+		if (ret)
+			return ret;
+
 		ret = devm_request_threaded_irq(dev, irq, NULL,
 				ad7091r_event_handler,
 				IRQF_TRIGGER_FALLING | IRQF_ONESHOT, name, iio_dev);
-- 
2.42.0