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From:   Peter Rosin <peda@axentia.se>
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        Russell King - ARM Linux <linux@armlinux.org.uk>,
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Subject: [PATCH v8 3/4] drm/atmel-hlcdc: iterate over all output endpoints
Date:   Fri, 10 Aug 2018 15:03:58 +0200
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This enables more flexible devicetrees. You can e.g. have two output
nodes where one is not enabled, without the ordering affecting things.

Prior to this patch the active node had to have endpoint id zero.

Signed-off-by: Peter Rosin <peda@axentia.se>
---
 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c | 32 ++++++++++++++++++------
 1 file changed, 25 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c
index 8db51fb131db..16c1b2f54b42 100644
--- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c
@@ -31,14 +31,16 @@ static const struct drm_encoder_funcs atmel_hlcdc_panel_encoder_funcs = {
 	.destroy = drm_encoder_cleanup,
 };
 
-static int atmel_hlcdc_attach_endpoint(struct drm_device *dev, int endpoint)
+static int atmel_hlcdc_attach_endpoint(struct drm_device *dev,
+				       struct of_endpoint *endpoint)
 {
 	struct drm_encoder *encoder;
 	struct drm_panel *panel;
 	struct drm_bridge *bridge;
 	int ret;
 
-	ret = drm_of_find_panel_or_bridge(dev->dev->of_node, 0, endpoint,
+	ret = drm_of_find_panel_or_bridge(dev->dev->of_node,
+					  endpoint->port, endpoint->id,
 					  &panel, &bridge);
 	if (ret)
 		return ret;
@@ -77,13 +79,29 @@ static int atmel_hlcdc_attach_endpoint(struct drm_device *dev, int endpoint)
 
 int atmel_hlcdc_create_outputs(struct drm_device *dev)
 {
-	int endpoint, ret = 0;
-
-	for (endpoint = 0; !ret; endpoint++)
-		ret = atmel_hlcdc_attach_endpoint(dev, endpoint);
+	struct of_endpoint endpoint;
+	struct device_node *node = NULL;
+	int count = 0;
+	int ret = 0;
+
+	for_each_endpoint_of_node(dev->dev->of_node, node) {
+		of_graph_parse_endpoint(node, &endpoint);
+
+		if (endpoint.port)
+			continue;
+
+		ret = atmel_hlcdc_attach_endpoint(dev, &endpoint);
+		if (ret == -ENODEV)
+			continue;
+		if (ret) {
+			of_node_put(node);
+			break;
+		}
+		count++;
+	}
 
 	/* At least one device was successfully attached.*/
-	if (ret == -ENODEV && endpoint)
+	if (ret == -ENODEV && count)
 		return 0;
 
 	return ret;
-- 
2.11.0