diff options
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/drm_of.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c index b5f2f0fece99..2120f33bdf4a 100644 --- a/drivers/gpu/drm/drm_of.c +++ b/drivers/gpu/drm/drm_of.c @@ -3,8 +3,10 @@ #include <linux/list.h> #include <linux/of_graph.h> #include <drm/drmP.h> +#include <drm/drm_bridge.h> #include <drm/drm_crtc.h> #include <drm/drm_encoder.h> +#include <drm/drm_panel.h> #include <drm/drm_of.h> static void drm_release_of(struct device *dev, void *data) @@ -208,3 +210,53 @@ int drm_of_encoder_active_endpoint(struct device_node *node, return -EINVAL; } EXPORT_SYMBOL_GPL(drm_of_encoder_active_endpoint); + +/* + * drm_of_find_panel_or_bridge - return connected panel or bridge device + * @np: device tree node containing encoder output ports + * @panel: pointer to hold returned drm_panel + * @bridge: pointer to hold returned drm_bridge + * + * Given 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 zero if successful, or one of the standard error codes if it fails. + */ +int drm_of_find_panel_or_bridge(const struct device_node *np, + int port, int endpoint, + struct drm_panel **panel, + struct drm_bridge **bridge) +{ + int ret = -EPROBE_DEFER; + struct device_node *remote; + + if (!panel && !bridge) + return -EINVAL; + + remote = of_graph_get_remote_node(np, port, endpoint); + if (!remote) + return -ENODEV; + + if (panel) { + *panel = of_drm_find_panel(remote); + if (*panel) + ret = 0; + } + + /* No panel found yet, check for a bridge next. */ + if (bridge) { + if (ret) { + *bridge = of_drm_find_bridge(remote); + if (*bridge) + ret = 0; + } else { + *bridge = NULL; + } + + } + + of_node_put(remote); + return ret; +} +EXPORT_SYMBOL_GPL(drm_of_find_panel_or_bridge); |