17  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
47  * drm_panel_init - initialize a panel
49  * @dev: parent device of the panel
57 void drm_panel_init(struct drm_panel *panel, struct device *dev,  in drm_panel_init()
60 	INIT_LIST_HEAD(&panel->list);  in drm_panel_init()
61 	panel->dev = dev;  in drm_panel_init()
62 	panel->funcs = funcs;  in drm_panel_init()
63 	panel->connector_type = connector_type;  in drm_panel_init()
68  * drm_panel_add - add a panel to the global registry
77 	list_add_tail(&panel->list, &panel_list);  in drm_panel_add()
83  * drm_panel_remove - remove a panel from the global registry
91 	list_del_init(&panel->list);  in drm_panel_remove()
97  * drm_panel_prepare - power on a panel
109 		return -EINVAL;  in drm_panel_prepare()
111 	if (panel->funcs && panel->funcs->prepare)  in drm_panel_prepare()
112 		return panel->funcs->prepare(panel);  in drm_panel_prepare()
119  * drm_panel_unprepare - power off a panel
132 		return -EINVAL;  in drm_panel_unprepare()
134 	if (panel->funcs && panel->funcs->unprepare)  in drm_panel_unprepare()
135 		return panel->funcs->unprepare(panel);  in drm_panel_unprepare()
142  * drm_panel_enable - enable a panel
156 		return -EINVAL;  in drm_panel_enable()
158 	if (panel->funcs && panel->funcs->enable) {  in drm_panel_enable()
159 		ret = panel->funcs->enable(panel);  in drm_panel_enable()
164 	ret = backlight_enable(panel->backlight);  in drm_panel_enable()
166 		DRM_DEV_INFO(panel->dev, "failed to enable backlight: %d\n",  in drm_panel_enable()
174  * drm_panel_disable - disable a panel
188 		return -EINVAL;  in drm_panel_disable()
190 	ret = backlight_disable(panel->backlight);  in drm_panel_disable()
192 		DRM_DEV_INFO(panel->dev, "failed to disable backlight: %d\n",  in drm_panel_disable()
195 	if (panel->funcs && panel->funcs->disable)  in drm_panel_disable()
196 		return panel->funcs->disable(panel);  in drm_panel_disable()
203  * drm_panel_get_modes - probe the available display modes of a panel
217 		return -EINVAL;  in drm_panel_get_modes()
219 	if (panel->funcs && panel->funcs->get_modes)  in drm_panel_get_modes()
220 		return panel->funcs->get_modes(panel, connector);  in drm_panel_get_modes()
222 	return -EOPNOTSUPP;  in drm_panel_get_modes()
228  * of_drm_find_panel - look up a panel using a device tree node
229  * @np: device tree node of the panel
231  * Searches the set of registered panels for one that matches the given device
232  * tree node. If a matching panel is found, return a pointer to it.
234  * Return: A pointer to the panel registered for the specified device tree
235  * node or an ERR_PTR() if no panel matching the device tree node can be found.
239  * - EPROBE_DEFER: the panel device has not been probed yet, and the caller
241  * - ENODEV: the device is not available (status != "okay" or "ok")
248 		return ERR_PTR(-ENODEV);  in of_drm_find_panel()
253 		if (panel->dev->of_node == np) {  in of_drm_find_panel()
260 	return ERR_PTR(-EPROBE_DEFER);  in of_drm_find_panel()
265  * of_drm_get_panel_orientation - look up the orientation of the panel through
266  * the "rotation" binding from a device tree node
267  * @np: device tree node of the panel
270  * Looks up the rotation of a panel in the device tree. The orientation of the
271  * panel is expressed as a property name "rotation" in the device tree. The
272  * rotation in the device tree is counter clockwise.
283 	if (ret == -EINVAL) {  in of_drm_get_panel_orientation()
301 		return -EINVAL;  in of_drm_get_panel_orientation()
310  * drm_panel_of_backlight - use backlight device node for backlight
314  * uses device tree and has a backlight phandle.
322  * A typical implementation for a panel driver supporting device tree
333 	if (!panel || !panel->dev)  in drm_panel_of_backlight()
334 		return -EINVAL;  in drm_panel_of_backlight()
336 	backlight = devm_of_find_backlight(panel->dev);  in drm_panel_of_backlight()
341 	panel->backlight = backlight;  in drm_panel_of_backlight()