// SPDX-License-Identifier: GPL-2.0-only #include <linux/component.h> #include <linux/export.h> #include <linux/list.h> #include <linux/media-bus-format.h> #include <linux/of.h> #include <linux/of_graph.h> #include <drm/drm_bridge.h> #include <drm/drm_crtc.h> #include <drm/drm_device.h> #include <drm/drm_encoder.h> #include <drm/drm_mipi_dsi.h> #include <drm/drm_of.h> #include <drm/drm_panel.h> /** * DOC: overview * * A set of helper functions to aid DRM drivers in parsing standard DT * properties. */ /** * drm_of_crtc_port_mask - find the mask of a registered CRTC by port OF node * @dev: DRM device * @port: port OF node * * Given a port OF node, return the possible mask of the corresponding * CRTC within a device's list of CRTCs. Returns zero if not found. */ uint32_t drm_of_crtc_port_mask(struct drm_device *dev, struct device_node *port) { … } EXPORT_SYMBOL(…); /** * drm_of_find_possible_crtcs - find the possible CRTCs for an encoder port * @dev: DRM device * @port: encoder port to scan for endpoints * * Scan all endpoints attached to a port, locate their attached CRTCs, * and generate the DRM mask of CRTCs which may be attached to this * encoder. * * See Documentation/devicetree/bindings/graph.txt for the bindings. */ uint32_t drm_of_find_possible_crtcs(struct drm_device *dev, struct device_node *port) { … } EXPORT_SYMBOL(…); /** * drm_of_component_match_add - Add a component helper OF node match rule * @master: master device * @matchptr: component match pointer * @compare: compare function used for matching component * @node: of_node */ void drm_of_component_match_add(struct device *master, struct component_match **matchptr, int (*compare)(struct device *, void *), struct device_node *node) { … } EXPORT_SYMBOL_GPL(…); /** * drm_of_component_probe - Generic probe function for a component based master * @dev: master device containing the OF node * @compare_of: compare function used for matching components * @m_ops: component master ops to be used * * 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. * * Returns zero if successful, or one of the standard error codes if it fails. */ int drm_of_component_probe(struct device *dev, int (*compare_of)(struct device *, void *), const struct component_master_ops *m_ops) { … } EXPORT_SYMBOL(…); /* * drm_of_encoder_active_endpoint - return the active encoder endpoint * @node: device tree node containing encoder input ports * @encoder: drm_encoder * * Given an encoder device node and a drm_encoder with a connected crtc, * parse the encoder endpoint connecting to the crtc port. */ int drm_of_encoder_active_endpoint(struct device_node *node, struct drm_encoder *encoder, struct of_endpoint *endpoint) { … } EXPORT_SYMBOL_GPL(…); /** * drm_of_find_panel_or_bridge - return connected panel or bridge device * @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 * @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. * * This function is deprecated and should not be used in new drivers. Use * devm_drm_of_get_bridge() instead. * * 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) { … } EXPORT_SYMBOL_GPL(…); enum drm_of_lvds_pixels { … }; static int drm_of_lvds_get_port_pixels_type(struct device_node *port_node) { … } static int drm_of_lvds_get_remote_pixels_type( const struct device_node *port_node) { … } /** * drm_of_lvds_get_dual_link_pixel_order - Get LVDS dual-link pixel order * @port1: First DT port node of the Dual-link LVDS source * @port2: Second DT port node of the Dual-link LVDS source * * An LVDS dual-link connection is made of two links, with even pixels * transitting on one link, and odd pixels on the other link. This function * returns, for two ports of an LVDS dual-link source, which port shall transmit * the even and odd pixels, based on the requirements of the connected sink. * * The pixel order is determined from the dual-lvds-even-pixels and * dual-lvds-odd-pixels properties in the sink's DT port nodes. If those * properties are not present, or if their usage is not valid, this function * returns -EINVAL. * * If either port is not connected, this function returns -EPIPE. * * @port1 and @port2 are typically DT sibling nodes, but may have different * parents when, for instance, two separate LVDS encoders carry the even and odd * pixels. * * Return: * * DRM_LVDS_DUAL_LINK_EVEN_ODD_PIXELS - @port1 carries even pixels and @port2 * carries odd pixels * * DRM_LVDS_DUAL_LINK_ODD_EVEN_PIXELS - @port1 carries odd pixels and @port2 * carries even pixels * * -EINVAL - @port1 and @port2 are not connected to a dual-link LVDS sink, or * the sink configuration is invalid * * -EPIPE - when @port1 or @port2 are not connected */ int drm_of_lvds_get_dual_link_pixel_order(const struct device_node *port1, const struct device_node *port2) { … } EXPORT_SYMBOL_GPL(…); /** * drm_of_lvds_get_data_mapping - Get LVDS data mapping * @port: DT port node of the LVDS source or sink * * Convert DT "data-mapping" property string value into media bus format value. * * Return: * * MEDIA_BUS_FMT_RGB666_1X7X3_SPWG - data-mapping is "jeida-18" * * MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA - data-mapping is "jeida-24" * * MEDIA_BUS_FMT_RGB888_1X7X4_SPWG - data-mapping is "vesa-24" * * -EINVAL - the "data-mapping" property is unsupported * * -ENODEV - the "data-mapping" property is missing */ int drm_of_lvds_get_data_mapping(const struct device_node *port) { … } EXPORT_SYMBOL_GPL(…); /** * drm_of_get_data_lanes_count - Get DSI/(e)DP data lane count * @endpoint: DT endpoint node of the DSI/(e)DP source or sink * @min: minimum supported number of data lanes * @max: maximum supported number of data lanes * * Count DT "data-lanes" property elements and check for validity. * * Return: * * min..max - positive integer count of "data-lanes" elements * * -ve - the "data-lanes" property is missing or invalid * * -EINVAL - the "data-lanes" property is unsupported */ int drm_of_get_data_lanes_count(const struct device_node *endpoint, const unsigned int min, const unsigned int max) { … } EXPORT_SYMBOL_GPL(…); /** * drm_of_get_data_lanes_count_ep - 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 and check for validity. * This variant uses endpoint specifier. * * Return: * * min..max - positive integer count of "data-lanes" elements * * -EINVAL - the "data-mapping" property is unsupported * * -ENODEV - the "data-mapping" property is missing */ int drm_of_get_data_lanes_count_ep(const struct device_node *port, int port_reg, int reg, const unsigned int min, const unsigned int max) { … } EXPORT_SYMBOL_GPL(…); #if IS_ENABLED(CONFIG_DRM_MIPI_DSI) /** * drm_of_get_dsi_bus - find the DSI bus for a given device * @dev: parent device of display (SPI, I2C) * * Gets parent DSI bus for a DSI device controlled through a bus other * than MIPI-DCS (SPI, I2C, etc.) using the Device Tree. * * Returns pointer to mipi_dsi_host if successful, -EINVAL if the * request is unsupported, -EPROBE_DEFER if the DSI host is found but * not available, or -ENODEV otherwise. */ struct mipi_dsi_host *drm_of_get_dsi_bus(struct device *dev) { … } EXPORT_SYMBOL_GPL(…); #endif /* CONFIG_DRM_MIPI_DSI */
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