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Date:   Tue,  4 Apr 2017 14:15:23 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     airlied@...ux.ie
Cc:     Neil Armstrong <narmstrong@...libre.com>,
        dri-devel@...ts.freedesktop.org, linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 03/11] drm/meson: Add support for components

This patch adds support for optional components connected through the
Device Tree endpoints scheme.

Acked-by: Daniel Vetter <daniel.vetter@...ll.ch>
Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
---
 drivers/gpu/drm/meson/meson_drv.c | 113 +++++++++++++++++++++++++++++++++-----
 1 file changed, 99 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/meson/meson_drv.c b/drivers/gpu/drm/meson/meson_drv.c
index bc562a0..a2e9f56 100644
--- a/drivers/gpu/drm/meson/meson_drv.c
+++ b/drivers/gpu/drm/meson/meson_drv.c
@@ -24,6 +24,7 @@
 #include <linux/module.h>
 #include <linux/mutex.h>
 #include <linux/platform_device.h>
+#include <linux/component.h>
 #include <linux/of_graph.h>
 
 #include <drm/drmP.h>
@@ -150,9 +151,9 @@ static bool meson_vpu_has_available_connectors(struct device *dev)
 	.max_register   = 0x1000,
 };
 
-static int meson_drv_probe(struct platform_device *pdev)
+static int meson_drv_bind(struct device *dev)
 {
-	struct device *dev = &pdev->dev;
+	struct platform_device *pdev = to_platform_device(dev);
 	struct meson_drm *priv;
 	struct drm_device *drm;
 	struct resource *res;
@@ -215,6 +216,15 @@ static int meson_drv_probe(struct platform_device *pdev)
 
 	drm_vblank_init(drm, 1);
 	drm_mode_config_init(drm);
+	drm->mode_config.max_width = 3840;
+	drm->mode_config.max_height = 2160;
+	drm->mode_config.funcs = &meson_mode_config_funcs;
+
+	/* Hardware Initialization */
+
+	meson_venc_init(priv);
+	meson_vpp_init(priv);
+	meson_viu_init(priv);
 
 	/* Encoder Initialization */
 
@@ -222,11 +232,11 @@ static int meson_drv_probe(struct platform_device *pdev)
 	if (ret)
 		goto free_drm;
 
-	/* Hardware Initialization */
-
-	meson_venc_init(priv);
-	meson_vpp_init(priv);
-	meson_viu_init(priv);
+	ret = component_bind_all(drm->dev, drm);
+	if (ret) {
+		dev_err(drm->dev, "Couldn't bind all components\n");
+		goto free_drm;
+	}
 
 	ret = meson_plane_create(priv);
 	if (ret)
@@ -241,9 +251,6 @@ static int meson_drv_probe(struct platform_device *pdev)
 		goto free_drm;
 
 	drm_mode_config_reset(drm);
-	drm->mode_config.max_width = 8192;
-	drm->mode_config.max_height = 8192;
-	drm->mode_config.funcs = &meson_mode_config_funcs;
 
 	priv->fbdev = drm_fbdev_cma_init(drm, 32,
 					 drm->mode_config.num_connector);
@@ -268,9 +275,9 @@ static int meson_drv_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int meson_drv_remove(struct platform_device *pdev)
+static void meson_drv_unbind(struct device *dev)
 {
-	struct drm_device *drm = dev_get_drvdata(&pdev->dev);
+	struct drm_device *drm = dev_get_drvdata(dev);
 	struct meson_drm *priv = drm->dev_private;
 
 	drm_dev_unregister(drm);
@@ -280,9 +287,88 @@ static int meson_drv_remove(struct platform_device *pdev)
 	drm_vblank_cleanup(drm);
 	drm_dev_unref(drm);
 
-	return 0;
 }
 
+static const struct component_master_ops meson_drv_master_ops = {
+	.bind	= meson_drv_bind,
+	.unbind	= meson_drv_unbind,
+};
+
+static int compare_of(struct device *dev, void *data)
+{
+	DRM_DEBUG_DRIVER("Comparing of node %s with %s\n",
+			 of_node_full_name(dev->of_node),
+			 of_node_full_name(data));
+
+	return dev->of_node == data;
+}
+
+/* Possible connectors nodes to ignore */
+static const struct of_device_id connectors_match[] = {
+	{ .compatible = "composite-video-connector" },
+	{ .compatible = "svideo-connector" },
+	{ .compatible = "hdmi-connector" },
+	{ .compatible = "dvi-connector" },
+	{}
+};
+
+static int meson_probe_remote(struct platform_device *pdev,
+			      struct component_match **match,
+			      struct device_node *parent,
+			      struct device_node *remote)
+{
+	struct device_node *ep, *remote_node;
+	int count = 1;
+
+	/* If node is a connector, return and do not add to match table */
+	if (of_match_node(connectors_match, remote))
+		return 1;
+
+	component_match_add(&pdev->dev, match, compare_of, remote);
+
+	for_each_endpoint_of_node(remote, ep) {
+		remote_node = of_graph_get_remote_port_parent(ep);
+		if (!remote_node ||
+		    remote_node == parent || /* Ignore parent endpoint */
+		    !of_device_is_available(remote_node))
+			continue;
+
+		count += meson_probe_remote(pdev, match, remote, remote_node);
+
+		of_node_put(remote_node);
+	}
+
+	return count;
+}
+
+static int meson_drv_probe(struct platform_device *pdev)
+{
+	struct component_match *match = NULL;
+	struct device_node *np = pdev->dev.of_node;
+	struct device_node *ep, *remote;
+	int count = 0;
+
+	for_each_endpoint_of_node(np, ep) {
+		remote = of_graph_get_remote_port_parent(ep);
+		if (!remote || !of_device_is_available(remote))
+			continue;
+
+		count += meson_probe_remote(pdev, &match, np, remote);
+	}
+
+	/* If some endpoints were found, initialize the nodes */
+	if (count) {
+		dev_info(&pdev->dev, "Queued %d outputs on vpu\n", count);
+
+		return component_master_add_with_match(&pdev->dev,
+						       &meson_drv_master_ops,
+						       match);
+	}
+
+	/* If no output endpoints were available, simply bail out */
+	return 0;
+};
+
 static const struct of_device_id dt_match[] = {
 	{ .compatible = "amlogic,meson-gxbb-vpu" },
 	{ .compatible = "amlogic,meson-gxl-vpu" },
@@ -293,7 +379,6 @@ static int meson_drv_remove(struct platform_device *pdev)
 
 static struct platform_driver meson_drm_platform_driver = {
 	.probe      = meson_drv_probe,
-	.remove     = meson_drv_remove,
 	.driver     = {
 		.name	= "meson-drm",
 		.of_match_table = dt_match,
-- 
1.9.1

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