drm: convert drivers to use of_graph_get_remote_node

Convert drivers to use the new of_graph_get_remote_node() helper
instead of parsing the endpoint node and then getting the remote device
node. Now drivers can just specify the device node and which
port/endpoint and get back the connected remote device node. The details
of the graph binding are nicely abstracted into the core OF graph code.

This changes some error messages to debug messages (in the graph core).
Graph connections are often "no connects" depending on the particular
board, so we want to avoid spurious messages. Plus the kernel is not a
DT validator.

Signed-off-by: Rob Herring <robh@kernel.org>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Tested-by: Liviu Dudau <liviu.dudau@arm.com>
Tested-by: Eric Anholt <eric@anholt.net>
Tested-by: Jyri Sarha <jsarha@ti.com>
Tested by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>

1 files changed, 3 insertions, 9 deletions

diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
index 3bd3bd688d1a..32ca351ecd09 100644
--- a/drivers/gpu/drm/mediatek/mtk_dpi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
@@ -661,7 +661,7 @@ static int mtk_dpi_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct mtk_dpi *dpi;
 	struct resource *mem;
-	struct device_node *ep, *bridge_node = NULL;
+	struct device_node *bridge_node;
 	int comp_id;
 	int ret;
 
@@ -706,15 +706,9 @@ static int mtk_dpi_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
-	ep = of_graph_get_next_endpoint(dev->of_node, NULL);
-	if (ep) {
-		bridge_node = of_graph_get_remote_port_parent(ep);
-		of_node_put(ep);
-	}
-	if (!bridge_node) {
-		dev_err(dev, "Failed to find bridge node\n");
+	bridge_node = of_graph_get_remote_node(dev->of_node, 0, 0);
+	if (!bridge_node)
 		return -ENODEV;
-	}
 
 	dev_info(dev, "Found bridge node: %s\n", bridge_node->full_name);