iio: addac: ad74413: don't set DIN_SINK for functions other than digital input

Apparently, despite the name Digital Input Configuration Register, the
settings in the DIN_CONFIGx registers also affect other channel
functions. In particular, setting a non-zero value in the DIN_SINK
field breaks the resistance measurement function.

Now, one can of course argue that specifying a drive-strength-microamp
property along with a adi,ch-func which is not one of the digital
input functions is a bug in the device tree. However, we have a rather
complicated setup with instances of ad74412r on external hardware
modules, and have set a default drive-strength-microamp in our DT
fragments describing those, merely modifying the adi,ch-func settings
to reflect however the modules have been wired up. And restricting
this setting to just being done for digital input doesn't make the
driver any more complex.

Fixes: 504eb485589d1 (iio: ad74413r: wire up support for drive-strength-microamp property)
Signed-off-by: Rasmus Villemoes <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Cc: <[e-mail]>
Signed-off-by: Jonathan Cameron <[e-mail]>

drivers/iio/addac/ad74413r.c

···
 		}
 
 		if (config->func == CH_FUNC_DIGITAL_INPUT_LOGIC ||
-		    config->func == CH_FUNC_DIGITAL_INPUT_LOOP_POWER)
+		    config->func == CH_FUNC_DIGITAL_INPUT_LOOP_POWER) {
 			st->comp_gpio_offsets[comp_gpio_i++] = i;
 
-		strength = config->drive_strength;
-		ret = ad74413r_set_comp_drive_strength(st, i, strength);
-		if (ret)
-			return ret;
+			strength = config->drive_strength;
+			ret = ad74413r_set_comp_drive_strength(st, i, strength);
+			if (ret)
+				return ret;
+		}
 
 		ret = ad74413r_set_gpo_config(st, i, gpo_config);
 		if (ret)