iio: adc: sun4i-gpadc-iio: register in the thermal after registering in pm

This driver has a get_temp function used by the thermal framework that
uses pm functions.

However, the driver isn't registered in pm before it is registered in
thermal framework, resulting in the pm_resume not being called and thus
the IP not enabled.

When the IP is disabled, the raw temp value is always 0. With the
devices currently supported, it isn't a problem since with their
respective formula, they return a really cold SoC temperature which
isn't a problem for the thermal framework. But for future SoC that have
a different formula, it could return a critically hot temperature,
forcing the thermal framework to shutdown the board.

Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/adc/sun4i-gpadc-iio.c

@@ -528,17 +528,10 @@ static int sun4i_gpadc_probe_dt(struct platform_device *pdev,
 		return ret;
 	}
 
-	if (!IS_ENABLED(CONFIG_THERMAL_OF))
-		return 0;
+	if (IS_ENABLED(CONFIG_THERMAL_OF))
+		info->sensor_device = &pdev->dev;
 
-	info->sensor_device = &pdev->dev;
-	info->tzd = thermal_zone_of_sensor_register(info->sensor_device, 0,
-						    info, &sun4i_ts_tz_ops);
-	if (IS_ERR(info->tzd))
-		dev_err(&pdev->dev, "could not register thermal sensor: %ld\n",
-			PTR_ERR(info->tzd));
-
-	return PTR_ERR_OR_ZERO(info->tzd);
+	return 0;
 }
 
 static int sun4i_gpadc_probe_mfd(struct platform_device *pdev,
@@ -585,15 +578,6 @@ static int sun4i_gpadc_probe_mfd(struct platform_device *pdev,
 		 * return the temperature.
 		 */
 		info->sensor_device = pdev->dev.parent;
-		info->tzd = thermal_zone_of_sensor_register(info->sensor_device,
-							    0, info,
-							    &sun4i_ts_tz_ops);
-		if (IS_ERR(info->tzd)) {
-			dev_err(&pdev->dev,
-				"could not register thermal sensor: %ld\n",
-				PTR_ERR(info->tzd));
-			return PTR_ERR(info->tzd);
-		}
 	} else {
 		indio_dev->num_channels =
 			ARRAY_SIZE(sun4i_gpadc_channels_no_temp);
@@ -663,6 +647,18 @@ static int sun4i_gpadc_probe(struct platform_device *pdev)
 	pm_runtime_set_suspended(&pdev->dev);
 	pm_runtime_enable(&pdev->dev);
 
+	if (IS_ENABLED(CONFIG_THERMAL_OF)) {
+		info->tzd = thermal_zone_of_sensor_register(info->sensor_device,
+							    0, info,
+							    &sun4i_ts_tz_ops);
+		if (IS_ERR(info->tzd)) {
+			dev_err(&pdev->dev,
+				"could not register thermal sensor: %ld\n",
+				PTR_ERR(info->tzd));
+			return PTR_ERR(info->tzd);
+		}
+	}
+
 	ret = devm_iio_device_register(&pdev->dev, indio_dev);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "could not register the device\n");