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drm: of: Add drm_of_get_dsi_bus helper function 

Add helper function to find DSI host for devices where DSI panel is not
a minor of a DSI bus (such as the Samsung AMS495QA01 panel or the
official Raspberry Pi touchscreen display).

Co-developed-by: Maya Matuszczyk <maccraft123mc@gmail.com>
Signed-off-by: Maya Matuszczyk <maccraft123mc@gmail.com>
Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Reviewed-by: Maxime Ripard <maxime@cerno.tech>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230123154603.1315112-2-macroalpha82@gmail.com
This commit is contained in:
Chris Morgan 2023-01-23 09:46:00 -06:00 committed by Linus Walleij
parent 413ebc4803
commit 19ff997ffc
2 changed files with 63 additions and 0 deletions
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51
drivers/gpu/drm/drm_of.c
View File

@ -10,6 +10,7 @@
#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>
@ -493,3 +494,53 @@ int drm_of_get_data_lanes_count_ep(const struct device_node *port,
return ret;
}
EXPORT_SYMBOL_GPL(drm_of_get_data_lanes_count_ep);
#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)
{
struct mipi_dsi_host *dsi_host;
struct device_node *endpoint, *dsi_host_node;
/*
* Get first endpoint child from device.
*/
endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
if (!endpoint)
return ERR_PTR(-ENODEV);
/*
* Follow the first endpoint to get the DSI host node and then
* release the endpoint since we no longer need it.
*/
dsi_host_node = of_graph_get_remote_port_parent(endpoint);
of_node_put(endpoint);
if (!dsi_host_node)
return ERR_PTR(-ENODEV);
/*
* Get the DSI host from the DSI host node. If we get an error
* or the return is null assume we're not ready to probe just
* yet. Release the DSI host node since we're done with it.
*/
dsi_host = of_find_mipi_dsi_host_by_node(dsi_host_node);
of_node_put(dsi_host_node);
if (IS_ERR_OR_NULL(dsi_host))
return ERR_PTR(-EPROBE_DEFER);
return dsi_host;
}
EXPORT_SYMBOL_GPL(drm_of_get_dsi_bus);
#endif /* CONFIG_DRM_MIPI_DSI */

12
include/drm/drm_of.h
View File

@ -15,6 +15,8 @@ struct drm_encoder;
struct drm_panel;
struct drm_bridge;
struct device_node;
struct mipi_dsi_device_info;
struct mipi_dsi_host;
/**
* enum drm_lvds_dual_link_pixels - Pixel order of an LVDS dual-link connection
@ -129,6 +131,16 @@ drm_of_get_data_lanes_count_ep(const struct device_node *port,
}
#endif
#if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_DRM_MIPI_DSI)
struct mipi_dsi_host *drm_of_get_dsi_bus(struct device *dev);
#else
static inline struct
mipi_dsi_host *drm_of_get_dsi_bus(struct device *dev)
{
return ERR_PTR(-EINVAL);
}
#endif /* CONFIG_OF && CONFIG_DRM_MIPI_DSI */
/*
* drm_of_panel_bridge_remove - remove panel bridge
* @np: device tree node containing panel bridge output ports