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drm/omap: dss: Rework output lookup by port node

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The omap_dss_find_output_by_port_node() function defined in output.c
looks up an output from its port node. To do so it needs to call helper
functions from dss-of.c to lookup the port parent and the port number.
As omap_dss_find_output_by_port_node() is only called by
omapdss_of_find_source_for_first_ep() from dss-of.c this goes back and
forth between the to source files and isn't very clear.

Simplify the code by passing both the parent and the port number to
omap_dss_find_output_by_port_node() instead of the port node, and rename
the function to omap_dss_find_output_by_port().

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Laurent Pinchart
2018-03-01 23:35:55 +02:00
committed by Tomi Valkeinen
parent 9184f8d94c
commit a7e82a67c1
3 changed files with 23 additions and 39 deletions
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39
drivers/gpu/drm/omapdrm/dss/dss-of.c
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@@ -21,7 +21,8 @@
#include "omapdss.h"
struct device_node *dss_of_port_get_parent_device(struct device_node *port)
static struct device_node *
dss_of_port_get_parent_device(struct device_node *port)
{
struct device_node *np;
int i;
@@ -45,40 +46,36 @@ struct device_node *dss_of_port_get_parent_device(struct device_node *port)
return NULL;
}
u32 dss_of_port_get_port_number(struct device_node *port)
{
int r;
u32 reg;
r = of_property_read_u32(port, "reg", &reg);
if (r)
reg = 0;
return reg;
}
struct omap_dss_device *
omapdss_of_find_source_for_first_ep(struct device_node *node)
{
struct device_node *ep;
struct device_node *src_node;
struct device_node *src_port;
struct device_node *ep;
struct omap_dss_device *src;
u32 port_number = 0;
/* Get the endpoint... */
ep = of_graph_get_endpoint_by_regs(node, 0, 0);
if (!ep)
return ERR_PTR(-EINVAL);
/* ... and its remote port... */
src_port = of_graph_get_remote_port(ep);
if (!src_port) {
of_node_put(ep);
return ERR_PTR(-EINVAL);
}
of_node_put(ep);
if (!src_port)
return ERR_PTR(-EINVAL);
src = omap_dss_find_output_by_port_node(src_port);
/* ... and the remote port's number and parent... */
of_property_read_u32(src_port, "reg", &port_number);
src_node = dss_of_port_get_parent_device(src_port);
of_node_put(src_port);
if (!src_node)
return NULL;
/* ... and finally the source. */
src = omap_dss_find_output_by_port(src_node, port_number);
of_node_put(src_node);
return src ? src : ERR_PTR(-EPROBE_DEFER);
}