[PATCH 10/36] drm/omap: add omapdss_of_get_endpoint() helper

[Tomi Valkeinen <tomi.valkeinen@xxxxxx>]

Add omapdss_of_get_endpoint() helper function to get the endpoint node
for the given port index and endpoint index.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxx>
---
 drivers/gpu/drm/omapdrm/dss/dss-of.c  | 61 +++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/omapdrm/dss/omapdss.h |  3 ++
 2 files changed, 64 insertions(+)

diff --git a/drivers/gpu/drm/omapdrm/dss/dss-of.c b/drivers/gpu/drm/omapdrm/dss/dss-of.c
index dfd4e9621e3b..aa9415d3c60b 100644
--- a/drivers/gpu/drm/omapdrm/dss/dss-of.c
+++ b/drivers/gpu/drm/omapdrm/dss/dss-of.c
@@ -180,3 +180,64 @@ omapdss_of_find_source_for_first_ep(struct device_node *node)
 	return src ? src : ERR_PTR(-EPROBE_DEFER);
 }
 EXPORT_SYMBOL_GPL(omapdss_of_find_source_for_first_ep);
+
+static struct device_node *omapdss_of_get_port_by_index(struct device_node *parent,
+	int index)
+{
+	struct device_node *port;
+
+	for (port = omapdss_of_get_next_port(parent, NULL);
+	     port != NULL;
+	     port = omapdss_of_get_next_port(parent, port)) {
+		u32 reg;
+		int r;
+
+		r = of_property_read_u32(port, "reg", &reg);
+		if (r)
+			reg = 0;
+
+		if (reg == index)
+			return port;
+	}
+
+	return NULL;
+}
+
+static struct device_node *omapdss_of_get_endpoint_by_index(struct device_node *port,
+	int index)
+{
+	struct device_node *ep;
+
+	for (ep = omapdss_of_get_next_endpoint(port, NULL);
+	     ep != NULL;
+	     ep = omapdss_of_get_next_endpoint(port, ep)) {
+		u32 reg;
+		int r;
+
+		r = of_property_read_u32(ep, "reg", &reg);
+		if (r)
+			reg = 0;
+
+		if (reg == index)
+			return ep;
+	}
+
+	return NULL;
+}
+
+struct device_node *omapdss_of_get_endpoint(struct device_node *parent,
+	int port_index, int ep_index)
+{
+	struct device_node *port, *ep;
+
+	port = omapdss_of_get_port_by_index(parent, port_index);
+	if (port == NULL)
+		return NULL;
+
+	ep = omapdss_of_get_endpoint_by_index(port, ep_index);
+
+	of_node_put(port);
+
+	return ep;
+}
+EXPORT_SYMBOL_GPL(omapdss_of_get_endpoint);
diff --git a/drivers/gpu/drm/omapdrm/dss/omapdss.h b/drivers/gpu/drm/omapdrm/dss/omapdss.h
index b420dde8c0fb..403bab718738 100644
--- a/drivers/gpu/drm/omapdrm/dss/omapdss.h
+++ b/drivers/gpu/drm/omapdrm/dss/omapdss.h
@@ -844,6 +844,9 @@ omapdss_of_get_first_endpoint(const struct device_node *parent);
 struct omap_dss_device *
 omapdss_of_find_source_for_first_ep(struct device_node *node);
 
+struct device_node *omapdss_of_get_endpoint(struct device_node *parent,
+	int port_index, int ep_index);
+
 u32 dispc_read_irqstatus(void);
 void dispc_clear_irqstatus(u32 mask);
 u32 dispc_read_irqenable(void);
-- 
2.7.4

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