[PATCH 1/9] drm/msm: Get mdss components via parsing ports

[Archit Taneja <architt@codeaurora.org>]

The driver currently identifies all the mdss components it needs by
parsing a phandle list from the 'connectors' DT property.

Instead of this, describe a list of ports that the MDP hardware provides
to the external world. These ports are linked to external encoder
interfaces such as DSI, HDMI in MDSS. These are also the subcomponent
devices that we need add. This description of ports complies with the
generic graph bindings.

In MDP4, the LVDS port's output connects directly to the LVDS panel. In
this case, we don't try to add it as a component.

Signed-off-by: Archit Taneja <architt@codeaurora.org>
---
 drivers/gpu/drm/msm/msm_drv.c | 54 ++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 53 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index 955ddfd..30b8f3b 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -1087,6 +1087,58 @@ static int add_components(struct device *dev, struct component_match **matchptr,
 	return 0;
 }
 
+/*
+ * Identify what components need to be added by parsing what the endpoints in
+ * our output ports are we. In the case of LVDS, there is no external component
+ * that we need to add since it's a part of MDP itself.
+ */
+static int add_mdss_components(struct device *dev,
+			       struct component_match **matchptr)
+{
+	struct device_node *np = dev->of_node;
+	struct device_node *ep_node;
+
+	for_each_endpoint_of_node(np, ep_node) {
+		struct device_node *intf;
+		struct of_endpoint ep;
+		int ret;
+
+		ret = of_graph_parse_endpoint(ep_node, &ep);
+		if (ret) {
+			dev_err(dev, "unable to parse port endpoint\n");
+			of_node_put(ep_node);
+			return ret;
+		}
+
+		/*
+		 * The LCDC/LVDS port on MDP4 is a speacial case where the
+		 * remote-endpoint isn't a component that we need to add
+		 */
+		if (of_device_is_compatible(np, "qcom,mdp4") && ep.port == 0) {
+			of_node_put(ep_node);
+			continue;
+		}
+
+		/*
+		 * It's okay if some of the ports don't have a remote endpoint
+		 * specified. It just means that the port isn't connected to
+		 * any external interface.
+		 */
+		intf = of_graph_get_remote_port_parent(ep_node);
+		if (!intf) {
+			of_node_put(ep_node);
+			continue;
+		}
+
+		component_match_add(dev, matchptr, compare_of, intf);
+
+		of_node_put(intf);
+		of_node_put(ep_node);
+	}
+
+	return 0;
+}
+
 static int msm_drm_bind(struct device *dev)
 {
 	return msm_drm_init(dev, &msm_driver);
@@ -1110,7 +1162,7 @@ static int msm_pdev_probe(struct platform_device *pdev)
 {
 	struct component_match *match = NULL;
 
-	add_components(&pdev->dev, &match, "connectors");
+	add_mdss_components(&pdev->dev, &match);
 	add_components(&pdev->dev, &match, "gpus");
 
 	pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
-- 
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