[PATCH v2 3/5] thermal/drivers/generic-adc: Allow probe without TZ registration

Luca Weiss
2026-02-20T09:19:15Z

If the devicetree node is not referenced in a zone under /thermal-zones,
devm_thermal_of_zone_register will fail with -ENODEV.

Since the driver is now also registering as an IIO device[0], allow the
probe to continue without the thermal zone.

We also can't use gadc_thermal_get_temp anymore because we haven't
necessarily initialized tz_dev.

[0] commit 3762f5851ac5 ("thermal/drivers/thermal-generic-adc: Add temperature sensor channel")

Signed-off-by: Luca Weiss <luca.weiss@fairphone.com>
---
drivers/thermal/thermal-generic-adc.c | 20 +++++++++++---------
1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/drivers/thermal/thermal-generic-adc.c b/drivers/thermal/thermal-generic-adc.c
index 7c844589b153..4852e584468b 100644
--- a/drivers/thermal/thermal-generic-adc.c
+++ b/drivers/thermal/thermal-generic-adc.c
@@ -86,14 +86,16 @@ static int gadc_thermal_read_raw(struct iio_dev *indio_dev,
int *val, int *val2, long mask)
{
struct gadc_thermal_info *gtinfo = iio_priv(indio_dev);
+ int iio_val;
int ret;

switch (mask) {
case IIO_CHAN_INFO_PROCESSED:
- ret = gadc_thermal_get_temp(gtinfo->tz_dev, val);
- if (ret)
+ ret = iio_read_channel_processed(gtinfo->channel, &iio_val);
+ if (ret < 0)
return ret;

+ *val = gadc_thermal_adc_to_temp(gtinfo, iio_val);
return IIO_VAL_INT;

default:
@@ -197,14 +199,14 @@ static int gadc_thermal_probe(struct platform_device *pdev)
&gadc_thermal_ops);
if (IS_ERR(gti->tz_dev)) {
ret = PTR_ERR(gti->tz_dev);
- if (ret != -EPROBE_DEFER)
- dev_err(dev,
- "Thermal zone sensor register failed: %d\n",
- ret);
- return ret;
- }
+ if (ret == -EPROBE_DEFER)
+ return ret;

- devm_thermal_add_hwmon_sysfs(dev, gti->tz_dev);
+ dev_info(dev, "Thermal zone sensor register failed: %d\n",
+ ret);
+ } else {
+ devm_thermal_add_hwmon_sysfs(dev, gti->tz_dev);
+ }

return gadc_iio_register(&pdev->dev, gti);
}

--
2.53.0