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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: 504eb48558 (iio: ad74413r: wire up support for drive-strength-microamp property)
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Link: https://lore.kernel.org/r/20230503105042.453755-1-linux@rasmusvillemoes.dk
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Rasmus Villemoes 2023-05-03 12:50:41 +02:00 committed by Jonathan Cameron
parent 48e1560230
commit a4cba07e64
1 changed files with 6 additions and 5 deletions
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11
drivers/iio/addac/ad74413r.c
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@ -1317,13 +1317,14 @@ static int ad74413r_setup_gpios(struct ad74413r_state *st)
}
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)