[PATCH v4 09/11] drm/bridge: lt8713sx: switch to of_drm_get_bridge_by_endpoint()

[Luca Ceresoli]

This driver calls drm_of_find_panel_or_bridge() with a NULL pointer in the
@panel parameter, thus using a reduced feature set of that function.
Replace this call with the simpler of_drm_get_bridge_by_endpoint().

Since of_drm_get_bridge_by_endpoint() increases the refcount of the
returned bridge, ensure it is put on removal. To achieve this, instead of
adding an explicit drm_bridge_put(), migrate to the bridge::next_bridge
pointer which is automatically put when the bridge is eventually freed.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov at oss.qualcomm.com>
Signed-off-by: Luca Ceresoli <luca.ceresoli at bootlin.com>
---
 drivers/gpu/drm/bridge/lontium-lt8713sx.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/bridge/lontium-lt8713sx.c b/drivers/gpu/drm/bridge/lontium-lt8713sx.c
index 18fac6a46db4..cee485adf5e5 100644
--- a/drivers/gpu/drm/bridge/lontium-lt8713sx.c
+++ b/drivers/gpu/drm/bridge/lontium-lt8713sx.c
@@ -32,7 +32,6 @@ DECLARE_CRC8_TABLE(lt8713sx_crc_table);
 struct lt8713sx {
 	struct device *dev;
 	struct drm_bridge bridge;
-	struct drm_bridge *next_bridge;
 
 	struct regmap *regmap;
 	/* Protects all accesses to registers by stopping the on-chip MCU */
@@ -458,7 +457,7 @@ static int lt8713sx_bridge_attach(struct drm_bridge *bridge,
 	struct lt8713sx *lt8713sx = container_of(bridge, struct lt8713sx, bridge);
 
 	return drm_bridge_attach(encoder,
-				lt8713sx->next_bridge,
+				lt8713sx->bridge.next_bridge,
 				bridge, flags);
 }
 
@@ -537,10 +536,9 @@ static int lt8713sx_probe(struct i2c_client *client)
 	if (IS_ERR(lt8713sx->regmap))
 		return dev_err_probe(dev, PTR_ERR(lt8713sx->regmap), "regmap i2c init failed\n");
 
-	ret = drm_of_find_panel_or_bridge(lt8713sx->dev->of_node, 1, -1, NULL,
-					  &lt8713sx->next_bridge);
-	if (ret < 0)
-		return ret;
+	lt8713sx->bridge.next_bridge = of_drm_get_bridge_by_endpoint(lt8713sx->dev->of_node, 1, -1);
+	if (IS_ERR(lt8713sx->bridge.next_bridge))
+		return PTR_ERR(lt8713sx->bridge.next_bridge);
 
 	ret = lt8713sx_gpio_init(lt8713sx);
 	if (ret < 0)

-- 
2.53.0