media: meson: ao-cec: use new cec_notifier_parse_hdmi_phandle helper

The meson CEC driver increased the HDMI device refcount when
it shouldn't. Use the new helper function to ensure that that
doesn't happen and to simplify the driver code.
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/platform/meson/ao-cec.c

@@ -601,20 +601,14 @@ static const struct cec_adap_ops meson_ao_cec_ops = {
 static int meson_ao_cec_probe(struct platform_device *pdev)
 {
 	struct meson_ao_cec_device *ao_cec;
-	struct platform_device *hdmi_dev;
-	struct device_node *np;
+	struct device *hdmi_dev;
 	struct resource *res;
 	int ret, irq;
 
-	np = of_parse_phandle(pdev->dev.of_node, "hdmi-phandle", 0);
-	if (!np) {
-		dev_err(&pdev->dev, "Failed to find hdmi node\n");
-		return -ENODEV;
-	}
+	hdmi_dev = cec_notifier_parse_hdmi_phandle(&pdev->dev);
 
-	hdmi_dev = of_find_device_by_node(np);
-	if (hdmi_dev == NULL)
-		return -EPROBE_DEFER;
+	if (IS_ERR(hdmi_dev))
+		return PTR_ERR(hdmi_dev);
 
 	ao_cec = devm_kzalloc(&pdev->dev, sizeof(*ao_cec), GFP_KERNEL);
 	if (!ao_cec)
@@ -622,7 +616,7 @@ static int meson_ao_cec_probe(struct platform_device *pdev)
 
 	spin_lock_init(&ao_cec->cec_reg_lock);
 
-	ao_cec->notify = cec_notifier_get(&hdmi_dev->dev);
+	ao_cec->notify = cec_notifier_get(hdmi_dev);
 	if (!ao_cec->notify)
 		return -ENOMEM;