C++ (Cpp) of_graph_get_remote_endpoint Examples

Example #1

File: sun8i_mixer.c Project: Anjali05/linux

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", &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;
}

Example #2

File: of_coresight.c Project: Anjali05/linux

/*
 * 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;
}

Example #3

File: rcar_lvds.c Project: lumag/linux

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;
}