5  * The DP AUX bus is used for devices that are connected over a DisplayPort
6  * AUX bus. The device on the far side of the bus is referred to as an
9  * There is only one device connected to the DP AUX bus: an eDP panel.
11  * platform devices, putting them under the DP AUX bus allows the panel driver
27 	int (*done_probing)(struct drm_dp_aux *aux);
69 		ret = aux_ep_with_data->done_probing(aux_ep->aux);  in dp_aux_ep_probe()
79 					"DP AUX done_probing() can't defer\n");  in dp_aux_ep_probe()
131 	.name		= "dp-aux",
176  * of_dp_aux_ep_destroy() - Destroy an DP AUX endpoint device
181  * is called for _all_ of the child devices of the device providing the AUX bus.
211  * @aux: The AUX channel whose device we want to depopulate
216 void of_dp_aux_depopulate_bus(struct drm_dp_aux *aux)  in of_dp_aux_depopulate_bus()  argument
218 	device_for_each_child_reverse(aux->dev, NULL, of_dp_aux_ep_destroy);  in of_dp_aux_depopulate_bus()
223  * of_dp_aux_populate_bus() - Populate the endpoint device on the DP AUX
224  * @aux: The AUX channel whose device we want to populate. It is required that
225  *       drm_dp_aux_init() has already been called for this AUX channel.
231  * "aux-bus" node of the device providing the AUX channel (AKA aux->dev).
254 int of_dp_aux_populate_bus(struct drm_dp_aux *aux,  in of_dp_aux_populate_bus()  argument
255 			   int (*done_probing)(struct drm_dp_aux *aux))  in of_dp_aux_populate_bus()  argument
263 	WARN_ON_ONCE(!aux->ddc.algo);  in of_dp_aux_populate_bus()
265 	if (!aux->dev->of_node)  in of_dp_aux_populate_bus()
267 	bus = of_get_child_by_name(aux->dev->of_node, "aux-bus");  in of_dp_aux_populate_bus()
277 		dev_err(aux->dev, "DP AUX EP device already populated\n");  in of_dp_aux_populate_bus()
291 	aux_ep->aux = aux;  in of_dp_aux_populate_bus()
292 	aux_ep->dev.parent = aux->dev;  in of_dp_aux_populate_bus()
296 	dev_set_name(&aux_ep->dev, "aux-%s", dev_name(aux->dev));  in of_dp_aux_populate_bus()
300 		dev_err(aux->dev, "Failed to create AUX EP for %pOF: %d\n", np, ret);  in of_dp_aux_populate_bus()
330  * @aux: The AUX channel whose device we want to populate
335  * Handles freeing w/ devm on the device "aux->dev".
341 int devm_of_dp_aux_populate_bus(struct drm_dp_aux *aux,  in devm_of_dp_aux_populate_bus()  argument
342 				int (*done_probing)(struct drm_dp_aux *aux))  in devm_of_dp_aux_populate_bus()  argument
346 	ret = of_dp_aux_populate_bus(aux, done_probing);  in devm_of_dp_aux_populate_bus()
350 	return devm_add_action_or_reset(aux->dev,  in devm_of_dp_aux_populate_bus()
351 					of_dp_aux_depopulate_bus_void, aux);  in devm_of_dp_aux_populate_bus()
390 MODULE_DESCRIPTION("DRM DisplayPort AUX bus");