[PATCH v4 07/11] drm/bridge: lt9611: switch to of_drm_get_bridge_by_endpoint()

Luca Ceresoli
2026-05-04T10:45:52Z

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@oss.qualcomm.com>
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
---
drivers/gpu/drm/bridge/lontium-lt9611.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/bridge/lontium-lt9611.c b/drivers/gpu/drm/bridge/lontium-lt9611.c
index 4517aee83332..4b4418cc83bf 100644
--- a/drivers/gpu/drm/bridge/lontium-lt9611.c
+++ b/drivers/gpu/drm/bridge/lontium-lt9611.c
@@ -37,7 +37,6 @@
struct lt9611 {
struct device *dev;
struct drm_bridge bridge;
- struct drm_bridge *next_bridge;

struct regmap *regmap;

@@ -761,7 +760,7 @@ static int lt9611_bridge_attach(struct drm_bridge *bridge,
{
struct lt9611 *lt9611 = bridge_to_lt9611(bridge);

- return drm_bridge_attach(encoder, lt9611->next_bridge,
+ return drm_bridge_attach(encoder, lt9611->bridge.next_bridge,
bridge, flags);
}

@@ -1058,7 +1057,11 @@ static int lt9611_parse_dt(struct device *dev,

lt9611->ac_mode = of_property_read_bool(dev->of_node, "lt,ac-mode");

- return drm_of_find_panel_or_bridge(dev->of_node, 2, -1, NULL, &lt9611->next_bridge);
+ lt9611->bridge.next_bridge = of_drm_get_bridge_by_endpoint(dev->of_node, 2, -1);
+ if (IS_ERR(lt9611->bridge.next_bridge))
+ return PTR_ERR(lt9611->bridge.next_bridge);
+
+ return 0;
}

static int lt9611_gpio_init(struct lt9611 *lt9611)

--
2.53.0