drm/vc4: hdmi: Use a device-managed action for DDC

The reference to the DDC controller device needs to be put back when we're
done with it. Let's use a device-managed action to simplify the driver.
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220711173939.1132294-44-maxime@cerno.tech

drivers/gpu/drm/vc4/vc4_hdmi.c

@@ -2932,6 +2932,13 @@ static int vc4_hdmi_runtime_resume(struct device *dev)
 	return 0;
 }
 
+static void vc4_hdmi_put_ddc_device(void *ptr)
+{
+	struct vc4_hdmi *vc4_hdmi = ptr;
+
+	put_device(&vc4_hdmi->ddc->dev);
+}
+
 static int vc4_hdmi_bind(struct device *dev, struct device *master, void *data)
 {
 	const struct vc4_hdmi_variant *variant = of_device_get_match_data(dev);
@@ -2987,13 +2994,16 @@ static int vc4_hdmi_bind(struct device *dev, struct device *master, void *data)
 		return -EPROBE_DEFER;
 	}
 
+	ret = devm_add_action_or_reset(dev, vc4_hdmi_put_ddc_device, vc4_hdmi);
+	if (ret)
+		return ret;
+
 	/* Only use the GPIO HPD pin if present in the DT, otherwise
 	 * we'll use the HDMI core's register.
 	 */
 	vc4_hdmi->hpd_gpio = devm_gpiod_get_optional(dev, "hpd", GPIOD_IN);
 	if (IS_ERR(vc4_hdmi->hpd_gpio)) {
-		ret = PTR_ERR(vc4_hdmi->hpd_gpio);
-		goto err_put_ddc;
+		return PTR_ERR(vc4_hdmi->hpd_gpio);
 	}
 
 	vc4_hdmi->disable_wifi_frequencies =
@@ -3064,8 +3074,6 @@ static int vc4_hdmi_bind(struct device *dev, struct device *master, void *data)
 	pm_runtime_put_sync(dev);
 err_disable_runtime_pm:
 	pm_runtime_disable(dev);
-err_put_ddc:
-	put_device(&vc4_hdmi->ddc->dev);
 
 	return ret;
 }
@@ -3102,8 +3110,6 @@ static void vc4_hdmi_unbind(struct device *dev, struct device *master,
 	vc4_hdmi_hotplug_exit(vc4_hdmi);
 
 	pm_runtime_disable(dev);
-
-	put_device(&vc4_hdmi->ddc->dev);
 }
 
 static const struct component_ops vc4_hdmi_ops = {