1 files changed, 176 insertions, 0 deletions
diff --git a/drivers/video/fbdev/omap2/omapfb/dss/dss-of.c b/drivers/video/fbdev/omap2/omapfb/dss/dss-of.c
new file mode 100644
index 0000000000..0282d4eef1
--- /dev/null
+++ b/drivers/video/fbdev/omap2/omapfb/dss/dss-of.c
@@ -0,0 +1,176 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2013 Texas Instruments
+ * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_graph.h>
+#include <linux/seq_file.h>
+
+#include <video/omapfb_dss.h>
+
+#include "dss.h"
+
+struct device_node *
+omapdss_of_get_next_port(const struct device_node *parent,
+			 struct device_node *prev)
+{
+	struct device_node *port = NULL;
+
+	if (!parent)
+		return NULL;
+
+	if (!prev) {
+		struct device_node *ports;
+		/*
+		 * It's the first call, we have to find a port subnode
+		 * within this node or within an optional 'ports' node.
+		 */
+		ports = of_get_child_by_name(parent, "ports");
+		if (ports)
+			parent = ports;
+
+		port = of_get_child_by_name(parent, "port");
+
+		/* release the 'ports' node */
+		of_node_put(ports);
+	} else {
+		struct device_node *ports;
+
+		ports = of_get_parent(prev);
+		if (!ports)
+			return NULL;
+
+		do {
+			port = of_get_next_child(ports, prev);
+			if (!port) {
+				of_node_put(ports);
+				return NULL;
+			}
+			prev = port;
+		} while (!of_node_name_eq(port, "port"));
+
+		of_node_put(ports);
+	}
+
+	return port;
+}
+EXPORT_SYMBOL_GPL(omapdss_of_get_next_port);
+
+struct device_node *
+omapdss_of_get_next_endpoint(const struct device_node *parent,
+			     struct device_node *prev)
+{
+	struct device_node *ep = NULL;
+
+	if (!parent)
+		return NULL;
+
+	do {
+		ep = of_get_next_child(parent, prev);
+		if (!ep)
+			return NULL;
+		prev = ep;
+	} while (!of_node_name_eq(ep, "endpoint"));
+
+	return ep;
+}
+EXPORT_SYMBOL_GPL(omapdss_of_get_next_endpoint);
+
+struct device_node *dss_of_port_get_parent_device(struct device_node *port)
+{
+	struct device_node *np;
+	int i;
+
+	if (!port)
+		return NULL;
+
+	np = of_get_parent(port);
+
+	for (i = 0; i < 2 && np; ++i) {
+		struct property *prop;
+
+		prop = of_find_property(np, "compatible", NULL);
+
+		if (prop)
+			return np;
+
+		np = of_get_next_parent(np);
+	}
+
+	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;
+}
+
+static struct device_node *omapdss_of_get_remote_port(const struct device_node *node)
+{
+	struct device_node *np;
+
+	np = of_graph_get_remote_endpoint(node);
+	if (!np)
+		return NULL;
+
+	np = of_get_next_parent(np);
+
+	return np;
+}
+
+struct device_node *
+omapdss_of_get_first_endpoint(const struct device_node *parent)
+{
+	struct device_node *port, *ep;
+
+	port = omapdss_of_get_next_port(parent, NULL);
+
+	if (!port)
+		return NULL;
+
+	ep = omapdss_of_get_next_endpoint(port, NULL);
+
+	of_node_put(port);
+
+	return ep;
+}
+EXPORT_SYMBOL_GPL(omapdss_of_get_first_endpoint);
+
+struct omap_dss_device *
+omapdss_of_find_source_for_first_ep(struct device_node *node)
+{
+	struct device_node *ep;
+	struct device_node *src_port;
+	struct omap_dss_device *src;
+
+	ep = omapdss_of_get_first_endpoint(node);
+	if (!ep)
+		return ERR_PTR(-EINVAL);
+
+	src_port = omapdss_of_get_remote_port(ep);
+	if (!src_port) {
+		of_node_put(ep);
+		return ERR_PTR(-EINVAL);
+	}
+
+	of_node_put(ep);
+
+	src = omap_dss_find_output_by_port_node(src_port);
+
+	of_node_put(src_port);
+
+	return src ? src : ERR_PTR(-EPROBE_DEFER);
+}
+EXPORT_SYMBOL_GPL(omapdss_of_find_source_for_first_ep);