[PATCH v12 02/18] drm: bridge: panel: Add devm_drm_of_dsi_get_bridge helper

Jagan Teki
2023-01-26T14:46:28Z

Add devm OF helper to return the next DSI bridge in the chain.

Unlike general bridge return helper devm_drm_of_get_bridge, this
helper uses the dsi specific panel_or_bridge helper to find the
next DSI device in the pipeline.

Helper lookup a given child DSI node or a DT node's port and
endpoint number, find the connected node and return either
the associated struct drm_panel or drm_bridge device.

Cc: Maxime Ripard <mripard@kernel.org>
Cc: Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
---
Changes for v12, v11:
- none
Changes for v10:
- new patch

drivers/gpu/drm/bridge/panel.c | 34 ++++++++++++++++++++++++++++++++++
include/drm/drm_bridge.h | 2 ++
2 files changed, 36 insertions(+)

diff --git a/drivers/gpu/drm/bridge/panel.c b/drivers/gpu/drm/bridge/panel.c
index e8aae3cdc73d..be281eb26356 100644
--- a/drivers/gpu/drm/bridge/panel.c
+++ b/drivers/gpu/drm/bridge/panel.c
@@ -499,4 +499,38 @@ struct drm_bridge *drmm_of_get_bridge(struct drm_device *drm,
}
EXPORT_SYMBOL(drmm_of_get_bridge);

+/**
+ * devm_drm_of_dsi_get_bridge - Return next DSI bridge in the chain
+ * @dev: device to tie the bridge lifetime to
+ * @np: device tree node containing encoder output ports
+ * @port: port in the device tree node
+ * @endpoint: endpoint in the device tree node
+ *
+ * Lookup a given child DSI node or a DT node's port and endpoint number,
+ * find the connected node and return either the associated struct drm_panel
+ * or drm_bridge device. Either @panel or @bridge must not be NULL.
+ *
+ * Returns a pointer to the bridge if successful, or an error pointer
+ * otherwise.
+ */
+struct drm_bridge *devm_drm_of_dsi_get_bridge(struct device *dev,
+ struct device_node *np,
+ u32 port, u32 endpoint)
+{
+ struct drm_bridge *bridge;
+ struct drm_panel *panel;
+ int ret;
+
+ ret = drm_of_dsi_find_panel_or_bridge(np, port, endpoint,
+ &panel, &bridge);
+ if (ret)
+ return ERR_PTR(ret);
+
+ if (panel)
+ bridge = devm_drm_panel_bridge_add(dev, panel);
+
+ return bridge;
+}
+EXPORT_SYMBOL(devm_drm_of_dsi_get_bridge);
+
#endif
diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
index 42f86327b40a..ccb14e361d3f 100644
--- a/include/drm/drm_bridge.h
+++ b/include/drm/drm_bridge.h
@@ -931,6 +931,8 @@ struct drm_bridge *devm_drm_of_get_bridge(struct device *dev, struct device_node
u32 port, u32 endpoint);
struct drm_bridge *drmm_of_get_bridge(struct drm_device *drm, struct device_node *node,
u32 port, u32 endpoint);
+struct drm_bridge *devm_drm_of_dsi_get_bridge(struct device *dev, struct device_node *node,
+ u32 port, u32 endpoint);
#else
static inline struct drm_bridge *devm_drm_of_get_bridge(struct device *dev,
struct device_node *node,
--
2.25.1