[PATCH RFC v2 07/19] drm/bridge: waveshare-dsi: don't create a panel_bridge

[Luca Ceresoli <luca.ceresoli@bootlin.com>]

Now a panel_bridge is automatically created for every drm_panel, so this
call to devm_drm_panel_bridge_add() would lead to creating a second
panel_bridge for the same panel.

Update and simplify the code by just getting a reference to the
already-existing bridge using of_drm_get_bridge_by_endpoint().

As of_drm_get_bridge_by_endpoint() returns a refcounted bridge, take care
of putting the bridge reference by using bridge->next_bridge.

Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
---
 drivers/gpu/drm/bridge/waveshare-dsi.c | 17 +++++------------
 1 file changed, 5 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/bridge/waveshare-dsi.c b/drivers/gpu/drm/bridge/waveshare-dsi.c
index 420f3b870a74..2c40bfef2b45 100644
--- a/drivers/gpu/drm/bridge/waveshare-dsi.c
+++ b/drivers/gpu/drm/bridge/waveshare-dsi.c
@@ -16,11 +16,9 @@
 #include <drm/drm_bridge.h>
 #include <drm/drm_mipi_dsi.h>
 #include <drm/drm_of.h>
-#include <drm/drm_panel.h>
 
 struct ws_bridge {
 	struct drm_bridge bridge;
-	struct drm_bridge *next_bridge;
 	struct backlight_device *backlight;
 	struct device *dev;
 	struct regmap *reg_map;
@@ -89,7 +87,7 @@ static int ws_bridge_bridge_attach(struct drm_bridge *bridge,
 {
 	struct ws_bridge *ws = bridge_to_ws_bridge(bridge);
 
-	return drm_bridge_attach(encoder, ws->next_bridge,
+	return drm_bridge_attach(encoder, ws->bridge.next_bridge,
 				 &ws->bridge, flags);
 }
 
@@ -150,7 +148,6 @@ static struct backlight_device *ws_bridge_create_backlight(struct ws_bridge *ws)
 static int ws_bridge_probe(struct i2c_client *i2c)
 {
 	struct device *dev = &i2c->dev;
-	struct drm_panel *panel;
 	struct ws_bridge *ws;
 	int ret;
 
@@ -164,14 +161,10 @@ static int ws_bridge_probe(struct i2c_client *i2c)
 	if (IS_ERR(ws->reg_map))
 		return dev_err_probe(dev, PTR_ERR(ws->reg_map), "Failed to allocate regmap\n");
 
-	ret = drm_of_find_panel_or_bridge(dev->of_node, 1, -1, &panel, NULL);
-	if (ret)
-		return dev_err_probe(dev, ret, "Failed to find remote panel\n");
-
-	ws->next_bridge = devm_drm_panel_bridge_add(dev, panel);
-	drm_panel_put(panel);
-	if (IS_ERR(ws->next_bridge))
-		return PTR_ERR(ws->next_bridge);
+	ws->bridge.next_bridge = of_drm_get_bridge_by_endpoint(dev->of_node, 1, -1);
+	if (IS_ERR(ws->bridge.next_bridge))
+		return dev_err_probe(dev, PTR_ERR(ws->bridge.next_bridge),
+				     "Failed to find remote bridge\n");
 
 	ws->backlight = ws_bridge_create_backlight(ws);
 	if (IS_ERR(ws->backlight)) {

-- 
2.55.0