From: Philipp Zabel <philipp.za...@gmail.com>
The video interface bindings described in
Documentation/device-tree/bindings/media/video-interfaces.txt
are useful for DRM drivers, too. To decouple development,
duplicate the v4l2-of parser functions temporarily. Also modify
imx_drm_of_get_next_endpoint to decrement the refcount of prev.
Signed-off-by: Philipp Zabel <philipp.za...@gmail.com>
---
drivers/staging/imx-drm/Makefile | 2 +-
drivers/staging/imx-drm/imx-drm-of.c | 106 +++++++++++++++++++++++++++++++++++
drivers/staging/imx-drm/imx-drm.h | 4 ++
3 files changed, 111 insertions(+), 1 deletion(-)
create mode 100644 drivers/staging/imx-drm/imx-drm-of.c
diff --git a/drivers/staging/imx-drm/Makefile b/drivers/staging/imx-drm/Makefile
index 129e3a3..743b875 100644
--- a/drivers/staging/imx-drm/Makefile
+++ b/drivers/staging/imx-drm/Makefile
@@ -1,5 +1,5 @@
-imxdrm-objs := imx-drm-core.o
+imxdrm-objs := imx-drm-core.o imx-drm-of.o
obj-$(CONFIG_DRM_IMX) += imxdrm.o
diff --git a/drivers/staging/imx-drm/imx-drm-of.c
b/drivers/staging/imx-drm/imx-drm-of.c
new file mode 100644
index 0000000..12f37eb
--- /dev/null
+++ b/drivers/staging/imx-drm/imx-drm-of.c
@@ -0,0 +1,106 @@
+/*
+ * Video Interface OF binding parsing library
+ *
+ * Copyright (C) 2012 - 2013 Samsung Electronics Co., Ltd.
+ * Author: Sylwester Nawrocki <s.nawro...@samsung.com>
+ *
+ * Copyright (C) 2012 Renesas Electronics Corp.
+ * Author: Guennadi Liakhovetski <g.liakhovet...@gmx.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/of.h>
+
+/**
+ * imx_drm_get_next_endpoint() - get next endpoint node
+ * @parent: pointer to the parent device node
+ * @prev: previous endpoint node, or NULL to get first
+ *
+ * Return: An 'endpoint' node pointer with refcount incremented. Refcount
+ * of the passed @prev node is decremented.
+ */
+struct device_node *imx_drm_of_get_next_endpoint(
+ const struct device_node *parent, struct device_node *prev)
+{
+ struct device_node *endpoint;
+ struct device_node *port = NULL;
+
+ if (!parent)
+ return NULL;
+
+ if (!prev) {
+ struct device_node *node;
+ /*
+ * It's the first call, we have to find a port subnode
+ * within this node or within an optional 'ports' node.
+ */
+ node = of_get_child_by_name(parent, "ports");
+ if (node)
+ parent = node;
+
+ port = of_get_child_by_name(parent, "port");
+
+ if (port) {
+ /* Found a port, get an endpoint. */
+ endpoint = of_get_next_child(port, NULL);
+ of_node_put(port);
+ } else {
+ endpoint = NULL;
+ }
+
+ if (!endpoint)
+ pr_err("%s(): no endpoint nodes specified for %s\n",
+ __func__, parent->full_name);
+ of_node_put(node);
+ } else {
+ port = of_get_parent(prev);
+ if (!port) {
+ /* Hm, has someone given us the root node ?... */
+ of_node_put(prev);
+ return NULL;
+ }
+
+ endpoint = of_get_next_child(port, prev);
+ if (endpoint) {
+ of_node_put(port);
+ return endpoint;
+ }
+
+ /* No more endpoints under this port, try the next one. */
+ do {
+ port = of_get_next_child(parent, port);
+ if (!port)
+ return NULL;
+ } while (of_node_cmp(port->name, "port"));
+
+ /* Pick up the first endpoint in this port. */
+ endpoint = of_get_next_child(port, NULL);
+ of_node_put(port);
+ }
+
+ return endpoint;
+}
+EXPORT_SYMBOL_GPL(imx_drm_of_get_next_endpoint);
+
+/**
+ * imx_drm_of_get_remote_port() - get remote port node
+ * @node: pointer to a local endpoint device_node
+ *
+ * Return: Remote port node associated with remote endpoint node linked
+ * to @node. Use of_node_put() on it when done.
+ */
+struct device_node *imx_drm_of_get_remote_port(const struct device_node *node)
+{
+ struct device_node *np;
+
+ /* Get remote endpoint node. */
+ np = of_parse_phandle(node, "remote-endpoint", 0);
+ if (!np)
+ return NULL;
+ return of_get_next_parent(np);
+}
+EXPORT_SYMBOL_GPL(imx_drm_of_get_remote_port);
diff --git a/drivers/staging/imx-drm/imx-drm.h
b/drivers/staging/imx-drm/imx-drm.h
index aa21028..9af4a82 100644
--- a/drivers/staging/imx-drm/imx-drm.h
+++ b/drivers/staging/imx-drm/imx-drm.h
@@ -58,4 +58,8 @@ int imx_drm_connector_mode_valid(struct drm_connector
*connector,
void imx_drm_connector_destroy(struct drm_connector *connector);
void imx_drm_encoder_destroy(struct drm_encoder *encoder);
+struct device_node *imx_drm_of_get_next_endpoint(
+ const struct device_node *parent, struct device_node *prev);
+struct device_node *imx_drm_of_get_remote_port(const struct device_node *node);
+
#endif /* _IMX_DRM_H_ */
--
1.8.5.3
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