linux-kernel - [PATCH v6 10/10] drm/bridge: ch7033: Switch to use fwnode based APIs

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Date: Mon, 27 May 2024 04:21:15 +0800
From: Sui Jingfeng <sui.jingfeng@...ux.dev>
To: Robert Foss <rfoss@...nel.org>,
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>
Cc: dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	Sui Jingfeng <sui.jingfeng@...ux.dev>
Subject: [PATCH v6 10/10] drm/bridge: ch7033: Switch to use fwnode based APIs

Use the freshly created helper to replace the use of DT-dependent APIs,
also print error log if the fwnode graph is not complete which is benefit
to debug.

Signed-off-by: Sui Jingfeng <sui.jingfeng@...ux.dev>
---
 drivers/gpu/drm/bridge/chrontel-ch7033.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/bridge/chrontel-ch7033.c b/drivers/gpu/drm/bridge/chrontel-ch7033.c
index c6374440af7f..35dd2e6ba6c0 100644
--- a/drivers/gpu/drm/bridge/chrontel-ch7033.c
+++ b/drivers/gpu/drm/bridge/chrontel-ch7033.c
@@ -531,6 +531,7 @@ static const struct regmap_config ch7033_regmap_config = {
 static int ch7033_probe(struct i2c_client *client)
 {
 	struct device *dev = &client->dev;
+	struct fwnode_handle *fwnode = dev_fwnode(dev);
 	struct ch7033_priv *priv;
 	unsigned int val;
 	int ret;
@@ -541,10 +542,15 @@ static int ch7033_probe(struct i2c_client *client)
 
 	dev_set_drvdata(dev, priv);
 
-	ret = drm_of_find_panel_or_bridge(dev->of_node, 1, -1, NULL,
-					  &priv->next_bridge);
-	if (ret)
+	priv->next_bridge = drm_bridge_find_next_bridge_by_fwnode(fwnode, 1);
+	if (IS_ERR(priv->next_bridge)) {
+		ret = PTR_ERR(priv->next_bridge);
+		dev_err(dev, "Error in founding the next bridge: %d\n", ret);
 		return ret;
+	} else if (!priv->next_bridge) {
+		dev_dbg(dev, "Next bridge not found, deferring probe\n");
+		return -EPROBE_DEFER;
+	}
 
 	priv->regmap = devm_regmap_init_i2c(client, &ch7033_regmap_config);
 	if (IS_ERR(priv->regmap)) {
-- 
2.34.1