diff options
Diffstat (limited to 'drivers/gpu/drm/drm_of.c')
| -rw-r--r-- | drivers/gpu/drm/drm_of.c | 69 |
1 files changed, 52 insertions, 17 deletions
diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c index 5530919e0ba0..d03ada82eac9 100644 --- a/drivers/gpu/drm/drm_of.c +++ b/drivers/gpu/drm/drm_of.c @@ -55,7 +55,8 @@ EXPORT_SYMBOL(drm_of_crtc_port_mask); * and generate the DRM mask of CRTCs which may be attached to this * encoder. * - * See Documentation/devicetree/bindings/graph.txt for the bindings. + * See https://github.com/devicetree-org/dt-schema/blob/main/dtschema/schemas/graph.yaml + * for the bindings. */ uint32_t drm_of_find_possible_crtcs(struct drm_device *dev, struct device_node *port) @@ -106,7 +107,9 @@ EXPORT_SYMBOL_GPL(drm_of_component_match_add); * Parse the platform device OF node and bind all the components associated * with the master. Interface ports are added before the encoders in order to * satisfy their .bind requirements - * See Documentation/devicetree/bindings/graph.txt for the bindings. + * + * See https://github.com/devicetree-org/dt-schema/blob/main/dtschema/schemas/graph.yaml + * for the bindings. * * Returns zero if successful, or one of the standard error codes if it fails. */ @@ -222,15 +225,15 @@ EXPORT_SYMBOL_GPL(drm_of_encoder_active_endpoint); * @np: device tree node containing encoder output ports * @port: port in the device tree node * @endpoint: endpoint in the device tree node - * @panel: pointer to hold returned drm_panel + * @panel: pointer to hold returned drm_panel, must not be NULL * @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. + * return either the associated struct drm_panel or drm_bridge device. * * This function is deprecated and should not be used in new drivers. Use - * devm_drm_of_get_bridge() instead. + * of_drm_get_bridge_by_endpoint() instead when not looking for a panel, or + * devm_drm_of_get_bridge() otherwise. * * Returns zero if successful, or one of the standard error codes if it fails. */ @@ -242,10 +245,10 @@ int drm_of_find_panel_or_bridge(const struct device_node *np, int ret = -EPROBE_DEFER; struct device_node *remote; - if (!panel && !bridge) + if (WARN_ON(!panel)) return -EINVAL; - if (panel) - *panel = NULL; + + *panel = NULL; /* * of_graph_get_remote_node() produces a noisy error message if port @@ -260,17 +263,15 @@ int drm_of_find_panel_or_bridge(const struct device_node *np, if (!remote) return -ENODEV; - if (panel) { - *panel = of_drm_find_panel(remote); - if (!IS_ERR(*panel)) - ret = 0; - else - *panel = NULL; - } + *panel = of_drm_find_panel(remote); + if (!IS_ERR(*panel)) + ret = 0; + else + *panel = NULL; - /* No panel found yet, check for a bridge next. */ if (bridge) { if (ret) { + /* No panel found yet, check for a bridge next. */ *bridge = of_drm_find_bridge(remote); if (*bridge) ret = 0; @@ -555,6 +556,40 @@ int drm_of_get_data_lanes_count_ep(const struct device_node *port, } EXPORT_SYMBOL_GPL(drm_of_get_data_lanes_count_ep); +/** + * drm_of_get_data_lanes_count_remote - Get DSI/(e)DP data lane count by endpoint + * @port: DT port node of the DSI/(e)DP source or sink + * @port_reg: identifier (value of reg property) of the parent port node + * @reg: identifier (value of reg property) of the endpoint node + * @min: minimum supported number of data lanes + * @max: maximum supported number of data lanes + * + * Count DT "data-lanes" property elements in the remote endpoint and check for + * validity. This variant uses endpoint specifier. + * + * Return: + * * min..max - positive integer count of "data-lanes" elements + * * -EINVAL - the "data-lanes" property is unsupported + * * -ENODEV - the "data-lanes" property is missing + */ +int drm_of_get_data_lanes_count_remote(const struct device_node *port, + int port_reg, int reg, + const unsigned int min, + const unsigned int max) +{ + struct device_node *endpoint, *remote; + int ret; + + endpoint = of_graph_get_endpoint_by_regs(port, port_reg, reg); + remote = of_graph_get_remote_endpoint(endpoint); + of_node_put(endpoint); + ret = drm_of_get_data_lanes_count(remote, min, max); + of_node_put(remote); + + return ret; +} +EXPORT_SYMBOL_GPL(drm_of_get_data_lanes_count_remote); + #if IS_ENABLED(CONFIG_DRM_MIPI_DSI) /** |