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From:   Stephen Boyd <swboyd@chromium.org>
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Douglas Anderson <dianders@chromium.org>
Cc:     linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
        dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org,
        Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
        Daniel Vetter <daniel.vetter@ffwll.ch>,
        "Rafael J. Wysocki" <rafael@kernel.org>,
        Rob Clark <robdclark@gmail.com>,
        Russell King <rmk+kernel@arm.linux.org.uk>,
        Saravana Kannan <saravanak@google.com>
Subject: [PATCH v6 05/35] drm/of: Add a drm_of_aggregate_probe() API
Date:   Thu, 27 Jan 2022 12:01:11 -0800
Message-Id: <20220127200141.1295328-6-swboyd@chromium.org>
In-Reply-To: <20220127200141.1295328-1-swboyd@chromium.org>
References: <20220127200141.1295328-1-swboyd@chromium.org>
MIME-Version: 1.0
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Similar to drm_of_component_probe() but using the new API that registers
a driver instead of an ops struct. This allows us to migrate the users
of drm_of_component_probe() to the new way of doing things.

Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Rob Clark <robdclark@gmail.com>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Cc: Saravana Kannan <saravanak@google.com>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
---
 drivers/gpu/drm/drm_of.c | 85 +++++++++++++++++++++++++++++++---------
 include/drm/drm_of.h     | 12 ++++++
 2 files changed, 78 insertions(+), 19 deletions(-)

diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c
index 59d368ea006b..0fe822319aae 100644
--- a/drivers/gpu/drm/drm_of.c
+++ b/drivers/gpu/drm/drm_of.c
@@ -99,30 +99,18 @@ void drm_of_component_match_add(struct device *master,
 }
 EXPORT_SYMBOL_GPL(drm_of_component_match_add);
 
-/**
- * drm_of_component_probe - Generic probe function for a component based master
- * @dev: master device containing the OF node
- * @compare_of: compare function used for matching components
- * @m_ops: component master ops to be used
- *
- * Parse the platform device OF node and bind all the components associated
- * with the master. Interface ports are added before the encoders in order to
- * satisfy their .bind requirements
- * See Documentation/devicetree/bindings/graph.txt for the bindings.
- *
- * Returns zero if successful, or one of the standard error codes if it fails.
- */
-int drm_of_component_probe(struct device *dev,
+static int _drm_of_component_probe(struct device *dev,
 			   int (*compare_of)(struct device *, void *),
-			   const struct component_master_ops *m_ops)
+			   struct component_match **matchptr)
 {
 	struct device_node *ep, *port, *remote;
-	struct component_match *match = NULL;
 	int i;
 
 	if (!dev->of_node)
 		return -EINVAL;
 
+	*matchptr = NULL;
+
 	/*
 	 * Bind the crtc's ports first, so that drm_of_find_possible_crtcs()
 	 * called from encoder's .bind callbacks works as expected
@@ -133,7 +121,7 @@ int drm_of_component_probe(struct device *dev,
 			break;
 
 		if (of_device_is_available(port->parent))
-			drm_of_component_match_add(dev, &match, compare_of,
+			drm_of_component_match_add(dev, matchptr, compare_of,
 						   port);
 
 		of_node_put(port);
@@ -144,7 +132,7 @@ int drm_of_component_probe(struct device *dev,
 		return -ENODEV;
 	}
 
-	if (!match) {
+	if (!*matchptr) {
 		dev_err(dev, "no available port\n");
 		return -ENODEV;
 	}
@@ -174,17 +162,76 @@ int drm_of_component_probe(struct device *dev,
 				continue;
 			}
 
-			drm_of_component_match_add(dev, &match, compare_of,
+			drm_of_component_match_add(dev, matchptr, compare_of,
 						   remote);
 			of_node_put(remote);
 		}
 		of_node_put(port);
 	}
 
+	return 0;
+}
+
+/**
+ * drm_of_component_probe - Generic probe function for a component based master
+ * @dev: master device containing the OF node
+ * @compare_of: compare function used for matching components
+ * @m_ops: component master ops to be used
+ *
+ * Parse the platform device OF node and bind all the components associated
+ * with the master. Interface ports are added before the encoders in order to
+ * satisfy their .bind requirements
+ * See Documentation/devicetree/bindings/graph.txt for the bindings.
+ *
+ * Deprecated: Use drm_of_aggregate_probe() instead.
+ *
+ * Returns zero if successful, or one of the standard error codes if it fails.
+ */
+int drm_of_component_probe(struct device *dev,
+			   int (*compare_of)(struct device *, void *),
+			   const struct component_master_ops *m_ops)
+{
+
+	struct component_match *match;
+	int ret;
+
+	ret = _drm_of_component_probe(dev, compare_of, &match);
+	if (ret)
+		return ret;
+
 	return component_master_add_with_match(dev, m_ops, match);
 }
 EXPORT_SYMBOL(drm_of_component_probe);
 
+
+/**
+ * drm_of_aggregate_probe - Generic probe function for a component based aggregate host
+ * @dev: device containing the OF node
+ * @compare_of: compare function used for matching components
+ * @adrv: aggregate driver to be used
+ *
+ * Parse the platform device OF node and bind all the components associated
+ * with the aggregate device. Interface ports are added before the encoders in
+ * order to satisfy their .bind_component requirements
+ * See Documentation/devicetree/bindings/graph.txt for the bindings.
+ *
+ * Returns zero if successful, or one of the standard error codes if it fails.
+ */
+int drm_of_aggregate_probe(struct device *dev,
+			   int (*compare_of)(struct device *, void *),
+			   struct aggregate_driver *adrv)
+{
+	struct component_match *match;
+	int ret;
+
+	ret = _drm_of_component_probe(dev, compare_of, &match);
+	if (ret)
+		return ret;
+
+	return component_aggregate_register(dev, adrv, match);
+}
+EXPORT_SYMBOL(drm_of_aggregate_probe);
+
 /*
  * drm_of_encoder_active_endpoint - return the active encoder endpoint
  * @node: device tree node containing encoder input ports
diff --git a/include/drm/drm_of.h b/include/drm/drm_of.h
index 99f79ac8b4cd..7c7b0d8377a7 100644
--- a/include/drm/drm_of.h
+++ b/include/drm/drm_of.h
@@ -7,6 +7,7 @@
 #include <drm/drm_bridge.h>
 #endif
 
+struct aggregate_driver;
 struct component_master_ops;
 struct component_match;
 struct device;
@@ -40,6 +41,9 @@ void drm_of_component_match_add(struct device *master,
 int drm_of_component_probe(struct device *dev,
 			   int (*compare_of)(struct device *, void *),
 			   const struct component_master_ops *m_ops);
+int drm_of_aggregate_probe(struct device *dev,
+			   int (*compare_of)(struct device *, void *),
+			   struct aggregate_driver *adrv);
 int drm_of_encoder_active_endpoint(struct device_node *node,
 				   struct drm_encoder *encoder,
 				   struct of_endpoint *endpoint);
@@ -79,6 +83,14 @@ drm_of_component_probe(struct device *dev,
 	return -EINVAL;
 }
 
+static inline int
+drm_of_aggregate_probe(struct device *dev,
+		       int (*compare_of)(struct device *, void *),
+		       struct aggregate_driver *adrv)
+{
+	return -EINVAL;
+}
+
 static inline int drm_of_encoder_active_endpoint(struct device_node *node,
 						 struct drm_encoder *encoder,
 						 struct of_endpoint *endpoint)
-- 
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