patch "iio: magnetometer: st_magn: fix default DRDY pin selection for" added to char-misc-linus

This is a note to let you know that I've just added the patch titled

iio: magnetometer: st_magn: fix default DRDY pin selection for

to my char-misc git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git
in the char-misc-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From 49f79cd28f1e3333cbe0d616ce59ead0b24bf34e Mon Sep 17 00:00:00 2001
From: Advait Dhamorikar <[email protected]>
Date: Tue, 7 Apr 2026 12:50:59 +0530
Subject: iio: magnetometer: st_magn: fix default DRDY pin selection for
LIS2MDL

The device tree binding for st,lis2mdl does not support st,drdy-int-pin property. However, when no platform data is provided and the property is absent, the driver falls back to default_magn_pdata which hardcodes drdy_int_pin = 2. This causes st_sensors_set_drdy_int_pin to fail with -EINVAL because the LIS2MDL sensor settings have no INT2 DRDY mask defined.

Fix this by checking the sensor's INT2 DRDY mask availability at probe time and selecting the appropriate default pin. Sensors that do not support INT2 DRDY will default to INT1, while all others retain the existing default of INT2.

---
 drivers/iio/magnetometer/st_magn_core.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

index ef348d316c00..7644bd04654b 100644
@@ -506,6 +506,11 @@ static const struct st_sensors_platform_data default_magn_pdata = {
 	.drdy_int_pin = 2,
 };
 
+/* LIS2MDL only supports DRDY on INT1 */
+static const struct st_sensors_platform_data alt_magn_pdata = {
+	.drdy_int_pin = 1,
+};
+
 static int st_magn_read_raw(struct iio_dev *indio_dev,
 			struct iio_chan_spec const *ch, int *val,
 							int *val2, long mask)

@@ -628,8 +633,12 @@ int st_magn_common_probe(struct iio_dev *indio_dev)
 	mdata->current_fullscale = &mdata->sensor_settings->fs.fs_avl[0];
 	mdata->odr = mdata->sensor_settings->odr.odr_avl[0].hz;
 
-	if (!pdata)
-		pdata = (struct st_sensors_platform_data *)&default_magn_pdata;
+	if (!pdata) {
+		if (mdata->sensor_settings->drdy_irq.int2.mask)
+			pdata = (struct st_sensors_platform_data *)&default_magn_pdata;
+		else
+			pdata = (struct st_sensors_platform_data *)&alt_magn_pdata;
+	}
 
 	err = st_sensors_init_sensor(indio_dev, pdata);
 	if (err < 0)

2.54.0