linux-kernel - [PATCH v6 3/7] drm/bridge: fsl-ldb: Get the next non-panel bridge

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Message-Id: <20241112100547.2908497-4-victor.liu@nxp.com>
Date: Tue, 12 Nov 2024 18:05:43 +0800
From: Liu Ying <victor.liu@....com>
To: imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-clk@...r.kernel.org,
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Subject: [PATCH v6 3/7] drm/bridge: fsl-ldb: Get the next non-panel bridge

The next bridge in bridge chain could be a panel bridge or a non-panel
bridge.  Use devm_drm_of_get_bridge() to replace the combination
function calls of of_drm_find_panel() and devm_drm_panel_bridge_add()
to get either a panel bridge or a non-panel bridge, instead of getting
a panel bridge only.

Signed-off-by: Liu Ying <victor.liu@....com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
---
v6:
* No change.

v5:
* No change.

v4:
* No change.

v3:
* Collect Dmitry' R-b tag.

v2:
* No change.

 drivers/gpu/drm/bridge/fsl-ldb.c | 31 +++++++++++--------------------
 1 file changed, 11 insertions(+), 20 deletions(-)

diff --git a/drivers/gpu/drm/bridge/fsl-ldb.c b/drivers/gpu/drm/bridge/fsl-ldb.c
index 0e4bac7dd04f..b559f3e0bef6 100644
--- a/drivers/gpu/drm/bridge/fsl-ldb.c
+++ b/drivers/gpu/drm/bridge/fsl-ldb.c
@@ -15,7 +15,6 @@
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_bridge.h>
 #include <drm/drm_of.h>
-#include <drm/drm_panel.h>
 
 #define LDB_CTRL_CH0_ENABLE			BIT(0)
 #define LDB_CTRL_CH0_DI_SELECT			BIT(1)
@@ -86,7 +85,7 @@ static const struct fsl_ldb_devdata fsl_ldb_devdata[] = {
 struct fsl_ldb {
 	struct device *dev;
 	struct drm_bridge bridge;
-	struct drm_bridge *panel_bridge;
+	struct drm_bridge *next_bridge;
 	struct clk *clk;
 	struct regmap *regmap;
 	const struct fsl_ldb_devdata *devdata;
@@ -117,7 +116,7 @@ static int fsl_ldb_attach(struct drm_bridge *bridge,
 {
 	struct fsl_ldb *fsl_ldb = to_fsl_ldb(bridge);
 
-	return drm_bridge_attach(bridge->encoder, fsl_ldb->panel_bridge,
+	return drm_bridge_attach(bridge->encoder, fsl_ldb->next_bridge,
 				 bridge, flags);
 }
 
@@ -292,9 +291,7 @@ static const struct drm_bridge_funcs funcs = {
 static int fsl_ldb_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
-	struct device_node *panel_node;
 	struct device_node *remote1, *remote2;
-	struct drm_panel *panel;
 	struct fsl_ldb *fsl_ldb;
 	int dual_link;
 
@@ -318,33 +315,27 @@ static int fsl_ldb_probe(struct platform_device *pdev)
 	if (IS_ERR(fsl_ldb->regmap))
 		return PTR_ERR(fsl_ldb->regmap);
 
-	/* Locate the remote ports and the panel node */
+	/* Locate the remote ports. */
 	remote1 = of_graph_get_remote_node(dev->of_node, 1, 0);
 	remote2 = of_graph_get_remote_node(dev->of_node, 2, 0);
 	fsl_ldb->ch0_enabled = (remote1 != NULL);
 	fsl_ldb->ch1_enabled = (remote2 != NULL);
-	panel_node = of_node_get(remote1 ? remote1 : remote2);
 	of_node_put(remote1);
 	of_node_put(remote2);
 
-	if (!fsl_ldb->ch0_enabled && !fsl_ldb->ch1_enabled) {
-		of_node_put(panel_node);
-		return dev_err_probe(dev, -ENXIO, "No panel node found");
-	}
+	if (!fsl_ldb->ch0_enabled && !fsl_ldb->ch1_enabled)
+		return dev_err_probe(dev, -ENXIO, "No next bridge node found");
 
 	dev_dbg(dev, "Using %s\n",
 		fsl_ldb_is_dual(fsl_ldb) ? "dual-link mode" :
 		fsl_ldb->ch0_enabled ? "channel 0" : "channel 1");
 
-	panel = of_drm_find_panel(panel_node);
-	of_node_put(panel_node);
-	if (IS_ERR(panel))
-		return PTR_ERR(panel);
-
-	fsl_ldb->panel_bridge = devm_drm_panel_bridge_add(dev, panel);
-	if (IS_ERR(fsl_ldb->panel_bridge))
-		return PTR_ERR(fsl_ldb->panel_bridge);
-
+	fsl_ldb->next_bridge = devm_drm_of_get_bridge(dev, dev->of_node,
+						      fsl_ldb->ch0_enabled ? 1 : 2,
+						      0);
+	if (IS_ERR(fsl_ldb->next_bridge))
+		return dev_err_probe(dev, PTR_ERR(fsl_ldb->next_bridge),
+				     "failed to get next bridge\n");
 
 	if (fsl_ldb_is_dual(fsl_ldb)) {
 		struct device_node *port1, *port2;
-- 
2.34.1