static int sun8i_mixer_of_get_id(struct device_node *node)
{
struct device_node *port, *ep;
int ret = -EINVAL;
/* output is port 1 */
port = of_graph_get_port_by_id(node, 1);
if (!port)
return -EINVAL;
/* try to find downstream endpoint */
for_each_available_child_of_node(port, ep) {
struct device_node *remote;
u32 reg;
remote = of_graph_get_remote_endpoint(ep);
if (!remote)
continue;
ret = of_property_read_u32(remote, "reg", ®);
if (!ret) {
of_node_put(remote);
of_node_put(ep);
of_node_put(port);
return reg;
}
of_node_put(remote);
}
of_node_put(port);
return ret;
}
/*
* of_coresight_parse_endpoint : Parse the given output endpoint @ep
* and fill the connection information in @conn
*
* Parses the local port, remote device name and the remote port.
*
* Returns :
* 1 - If the parsing is successful and a connection record
* was created for an output connection.
* 0 - If the parsing completed without any fatal errors.
* -Errno - Fatal error, abort the scanning.
*/
static int of_coresight_parse_endpoint(struct device *dev,
struct device_node *ep,
struct coresight_connection *conn)
{
int ret = 0;
struct of_endpoint endpoint, rendpoint;
struct device_node *rparent = NULL;
struct device_node *rep = NULL;
struct device *rdev = NULL;
do {
/* Parse the local port details */
if (of_graph_parse_endpoint(ep, &endpoint))
break;
/*
* Get a handle on the remote endpoint and the device it is
* attached to.
*/
rep = of_graph_get_remote_endpoint(ep);
if (!rep)
break;
rparent = of_coresight_get_port_parent(rep);
if (!rparent)
break;
if (of_graph_parse_endpoint(rep, &rendpoint))
break;
/* If the remote device is not available, defer probing */
rdev = of_coresight_get_endpoint_device(rparent);
if (!rdev) {
ret = -EPROBE_DEFER;
break;
}
conn->outport = endpoint.port;
conn->child_name = devm_kstrdup(dev,
dev_name(rdev),
GFP_KERNEL);
conn->child_port = rendpoint.port;
/* Connection record updated */
ret = 1;
} while (0);
of_node_put(rparent);
of_node_put(rep);
put_device(rdev);
return ret;
}
static int rcar_lvds_parse_dt(struct rcar_lvds *lvds)
{
struct device_node *local_output = NULL;
struct device_node *remote_input = NULL;
struct device_node *remote = NULL;
struct device_node *node;
bool is_bridge = false;
int ret = 0;
local_output = of_graph_get_endpoint_by_regs(lvds->dev->of_node, 1, 0);
if (!local_output) {
dev_dbg(lvds->dev, "unconnected port@1\n");
return -ENODEV;
}
/*
* Locate the connected entity and infer its type from the number of
* endpoints.
*/
remote = of_graph_get_remote_port_parent(local_output);
if (!remote) {
dev_dbg(lvds->dev, "unconnected endpoint %pOF\n", local_output);
ret = -ENODEV;
goto done;
}
if (!of_device_is_available(remote)) {
dev_dbg(lvds->dev, "connected entity %pOF is disabled\n",
remote);
ret = -ENODEV;
goto done;
}
remote_input = of_graph_get_remote_endpoint(local_output);
for_each_endpoint_of_node(remote, node) {
if (node != remote_input) {
/*
* We've found one endpoint other than the input, this
* must be a bridge.
*/
is_bridge = true;
of_node_put(node);
break;
}
}
if (is_bridge) {
lvds->next_bridge = of_drm_find_bridge(remote);
if (!lvds->next_bridge)
ret = -EPROBE_DEFER;
} else {
lvds->panel = of_drm_find_panel(remote);
if (!lvds->panel)
ret = -EPROBE_DEFER;
}
done:
of_node_put(local_output);
of_node_put(remote_input);
of_node_put(remote);
return ret;
}