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>
diff --git a/drivers/gpu/drm/tilcdc/tilcdc_external.c b/drivers/gpu/drm/tilcdc/tilcdc_external.c
index b0dd5e8..711c7b3 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_external.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_external.c
@@ -185,39 +185,6 @@
return ret;
}
-static int tilcdc_node_has_port(struct device_node *dev_node)
-{
- struct device_node *node;
-
- node = of_get_child_by_name(dev_node, "ports");
- if (!node)
- node = of_get_child_by_name(dev_node, "port");
- if (!node)
- return 0;
- of_node_put(node);
-
- return 1;
-}
-
-static
-struct device_node *tilcdc_get_remote_node(struct device_node *node)
-{
- struct device_node *ep;
- struct device_node *parent;
-
- if (!tilcdc_node_has_port(node))
- return NULL;
-
- ep = of_graph_get_next_endpoint(node, NULL);
- if (!ep)
- return NULL;
-
- parent = of_graph_get_remote_port_parent(ep);
- of_node_put(ep);
-
- return parent;
-}
-
int tilcdc_attach_external_device(struct drm_device *ddev)
{
struct tilcdc_drm_private *priv = ddev->dev_private;
@@ -225,7 +192,7 @@
struct drm_bridge *bridge;
int ret;
- remote_node = tilcdc_get_remote_node(ddev->dev->of_node);
+ remote_node = of_graph_get_remote_node(ddev->dev->of_node, 0, 0);
if (!remote_node)
return 0;
@@ -264,35 +231,16 @@
struct component_match **match)
{
struct device_node *node;
- struct device_node *ep = NULL;
- int count = 0;
- int ret = 0;
- if (!tilcdc_node_has_port(dev->of_node))
- return 0;
+ node = of_graph_get_remote_node(dev->of_node, 0, 0);
- while ((ep = of_graph_get_next_endpoint(dev->of_node, ep))) {
- node = of_graph_get_remote_port_parent(ep);
- if (!node || !of_device_is_available(node)) {
- of_node_put(node);
- continue;
- }
-
- dev_dbg(dev, "Subdevice node '%s' found\n", node->name);
-
- if (of_device_is_compatible(node, "nxp,tda998x")) {
- if (match)
- drm_of_component_match_add(dev, match,
- dev_match_of, node);
- ret = 1;
- }
-
+ if (!of_device_is_compatible(node, "nxp,tda998x")) {
of_node_put(node);
- if (count++ > 1) {
- dev_err(dev, "Only one port is supported\n");
- return -EINVAL;
- }
+ return 0;
}
- return ret;
+ if (match)
+ drm_of_component_match_add(dev, match, dev_match_of, node);
+ of_node_put(node);
+ return 1;
}