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path: root/drivers/video/fbdev/omap2/omapfb/dss/dss-of.c
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Diffstat (limited to 'drivers/video/fbdev/omap2/omapfb/dss/dss-of.c')
-rw-r--r--drivers/video/fbdev/omap2/omapfb/dss/dss-of.c176
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);