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drm: of: Add drm_of_get_data_lanes_count and drm_of_get_data_lanes_ep

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Add helper function to count and sanitize DT "data-lanes" property
and return either error or the data-lanes count. This is useful for
both DSI and (e)DP "data-lanes" property. The later version of the
function is an extra wrapper which handles the endpoint look up by
regs, that's what majority of the drivers duplicate too, but not all
of them.

Reviewed-by: Andrzej Hajda <andrzej.hajda@intel.com>
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Andrzej Hajda <andrzej.hajda@intel.com>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Maxime Ripard <maxime@cerno.tech>
Cc: Robert Foss <robert.foss@linaro.org>
Cc: Sam Ravnborg <sam@ravnborg.org>
To: dri-devel@lists.freedesktop.org
Link: https://patchwork.freedesktop.org/patch/msgid/20220524010522.528569-1-marex@denx.de
This commit is contained in:
Marek Vasut 2022-05-24 03:05:12 +02:00
parent 7d188c521d
commit fc801750b1
2 changed files with 81 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

20
include/drm/drm_of.h
View file

@ -50,6 +50,12 @@ int drm_of_find_panel_or_bridge(const struct device_node *np,
int drm_of_lvds_get_dual_link_pixel_order(const struct device_node *port1,
const struct device_node *port2);
int drm_of_lvds_get_data_mapping(const struct device_node *port);
int drm_of_get_data_lanes_count(const struct device_node *endpoint,
const unsigned int min, const unsigned int max);
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);
#else
static inline uint32_t drm_of_crtc_port_mask(struct drm_device *dev,
struct device_node *port)
@ -105,6 +111,20 @@ drm_of_lvds_get_data_mapping(const struct device_node *port)
{
return -EINVAL;
}
int drm_of_get_data_lanes_count(const struct device_node *endpoint,
const unsigned int min, const unsigned int max)
{
return -EINVAL;
}
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)
{
return -EINVAL;
}
#endif
/*