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    Subject[RFC PATCH v1 04/12] drm/bridge-connector: set the PATH property for the connector
    Date
    In order to properly identify connectors (in particular, DisplayPort
    connectors wrapped into USB-C) allow bridge drivers to specify the value
    to be used for connector's PATH property.

    Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
    ---
    drivers/gpu/drm/drm_bridge_connector.c | 12 ++++++++++++
    include/drm/drm_bridge.h | 7 +++++++
    2 files changed, 19 insertions(+)

    diff --git a/drivers/gpu/drm/drm_bridge_connector.c b/drivers/gpu/drm/drm_bridge_connector.c
    index bf73960c2c2a..008d730e1c2f 100644
    --- a/drivers/gpu/drm/drm_bridge_connector.c
    +++ b/drivers/gpu/drm/drm_bridge_connector.c
    @@ -331,6 +331,7 @@ struct drm_connector *drm_bridge_connector_init(struct drm_device *drm,
    struct drm_connector *connector;
    struct i2c_adapter *ddc = NULL;
    struct drm_bridge *bridge, *panel_bridge = NULL;
    + const char *path = NULL;
    int connector_type;
    int ret;

    @@ -377,6 +378,9 @@ struct drm_connector *drm_bridge_connector_init(struct drm_device *drm,
    connector->fwnode = fwnode_handle_get(of_fwnode_handle(bridge->of_node));
    #endif

    + if (bridge->path)
    + path = bridge->path;
    +
    if (bridge->ddc)
    ddc = bridge->ddc;

    @@ -405,6 +409,14 @@ struct drm_connector *drm_bridge_connector_init(struct drm_device *drm,
    connector->polled = DRM_CONNECTOR_POLL_CONNECT
    | DRM_CONNECTOR_POLL_DISCONNECT;

    + if (path) {
    + drm_object_attach_property(&connector->base,
    + drm->mode_config.path_property,
    + 0);
    +
    + drm_connector_set_path_property(connector, path);
    + }
    +
    if (panel_bridge)
    drm_panel_bridge_set_orientation(connector, panel_bridge);

    diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
    index c339fc85fd07..98e9d76474f4 100644
    --- a/include/drm/drm_bridge.h
    +++ b/include/drm/drm_bridge.h
    @@ -753,6 +753,13 @@ struct drm_bridge {
    * before the peripheral.
    */
    bool pre_enable_prev_first;
    + /**
    + * @path: the 'path' of the bridge. For bridges at the end of this
    + * chain this is used to set the 'PATH' property of the connector.
    + * This string is not freed manually, so one either should use a static
    + * string here or a devres-allocated one.
    + */
    + const char *path;
    /**
    * @ddc: Associated I2C adapter for DDC access, if any.
    */
    --
    2.39.2
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