OMAPDSS: add of helpers

Add helpers to get ports and endpoints from DT data.

These helpers parse v4l2 style ports and endpoints, but compared to the
v4l2 helpers, these allow iterating ports and endpoints separately.

This is a temporary solution until we get generic code to parse the
ports and endpoints.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: Archit Taneja <archit@ti.com>

diff --git a/drivers/video/omap2/dss/Makefile b/drivers/video/omap2/dss/Makefile
index d3aa91bdd6a8a35b95a840f818d95a5717f9e25d..8aec8bda27ccfe2c11546c1f0405c51fe111e7b9 100644 (file)
--- a/drivers/video/omap2/dss/Makefile
+++ b/drivers/video/omap2/dss/Makefile
@@ -1,7 +1,7 @@
 obj-$(CONFIG_OMAP2_DSS) += omapdss.o
 # Core DSS files
 omapdss-y := core.o dss.o dss_features.o dispc.o dispc_coefs.o display.o \
-       output.o
+       output.o dss-of.o
 # DSS compat layer files
 omapdss-y += manager.o manager-sysfs.o overlay.o overlay-sysfs.o apply.o \
        dispc-compat.o display-sysfs.o

diff --git a/drivers/video/omap2/dss/dss-of.c b/drivers/video/omap2/dss/dss-of.c
new file mode 100644 (file)
index 0000000..a4b20aa
--- /dev/null
+++ b/drivers/video/omap2/dss/dss-of.c
@@ -0,0 +1,159 @@
+/*
+ * Copyright (C) 2013 Texas Instruments
+ * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/seq_file.h>
+
+#include <video/omapdss.h>
+
+struct device_node *
+omapdss_of_get_next_port(const struct device_node *parent,
+                        struct device_node *prev)
+{
+       struct device_node *port = NULL;
+
+       if (!parent)
+               return NULL;
+
+       if (!prev) {
+               struct device_node *ports;
+               /*
+                * It's the first call, we have to find a port subnode
+                * within this node or within an optional 'ports' node.
+                */
+               ports = of_get_child_by_name(parent, "ports");
+               if (ports)
+                       parent = ports;
+
+               port = of_get_child_by_name(parent, "port");
+
+               /* release the 'ports' node */
+               of_node_put(ports);
+       } else {
+               struct device_node *ports;
+
+               ports = of_get_parent(prev);
+               if (!ports)
+                       return NULL;
+
+               do {
+                       port = of_get_next_child(ports, prev);
+                       if (!port) {
+                               of_node_put(ports);
+                               return NULL;
+                       }
+                       prev = port;
+               } while (of_node_cmp(port->name, "port") != 0);
+       }
+
+       return port;
+}
+EXPORT_SYMBOL_GPL(omapdss_of_get_next_port);
+
+struct device_node *
+omapdss_of_get_next_endpoint(const struct device_node *parent,
+                            struct device_node *prev)
+{
+       struct device_node *ep = NULL;
+
+       if (!parent)
+               return NULL;
+
+       do {
+               ep = of_get_next_child(parent, prev);
+               if (!ep)
+                       return NULL;
+               prev = ep;
+       } while (of_node_cmp(ep->name, "endpoint") != 0);
+
+       return ep;
+}
+EXPORT_SYMBOL_GPL(omapdss_of_get_next_endpoint);
+
+static struct device_node *
+omapdss_of_get_remote_device_node(const struct device_node *node)
+{
+       struct device_node *np;
+       int i;
+
+       np = of_parse_phandle(node, "remote-endpoint", 0);
+
+       if (!np)
+               return NULL;
+
+       np = of_get_next_parent(np);
+
+       for (i = 0; i < 3 && np; ++i) {
+               struct property *prop;
+
+               prop = of_find_property(np, "compatible", NULL);
+
+               if (prop)
+                       return np;
+
+               np = of_get_next_parent(np);
+       }
+
+       return NULL;
+}
+
+struct device_node *
+omapdss_of_get_first_endpoint(const struct device_node *parent)
+{
+       struct device_node *port, *ep;
+
+       port = omapdss_of_get_next_port(parent, NULL);
+
+       if (!port)
+               return NULL;
+
+       ep = omapdss_of_get_next_endpoint(port, NULL);
+
+       of_node_put(port);
+
+       return ep;
+}
+EXPORT_SYMBOL_GPL(omapdss_of_get_first_endpoint);
+
+struct omap_dss_device *
+omapdss_of_find_source_for_first_ep(struct device_node *node)
+{
+       struct device_node *ep;
+       struct device_node *src_node;
+       struct omap_dss_device *src;
+
+       ep = omapdss_of_get_first_endpoint(node);
+       if (!ep)
+               return ERR_PTR(-EINVAL);
+
+       src_node = omapdss_of_get_remote_device_node(ep);
+
+       of_node_put(ep);
+
+       if (!src_node)
+               return ERR_PTR(-EINVAL);
+
+       src = omap_dss_find_output_by_node(src_node);
+
+       of_node_put(src_node);
+
+       if (!src)
+               return ERR_PTR(-EPROBE_DEFER);
+
+       return src;
+}
+EXPORT_SYMBOL_GPL(omapdss_of_find_source_for_first_ep);

diff --git a/include/video/omapdss.h b/include/video/omapdss.h
index 3d7c51a6f9ff27de17f5f748afb00bc190e3d6cf..e3cd2a921c2f201d6e23dc6b5e5bbe925adeffd6 100644 (file)
--- a/include/video/omapdss.h
+++ b/include/video/omapdss.h
@@ -1019,4 +1019,18 @@ static inline bool omapdss_device_is_enabled(struct omap_dss_device *dssdev)
        return dssdev->state == OMAP_DSS_DISPLAY_ACTIVE;
 }
 
+struct device_node *
+omapdss_of_get_next_port(const struct device_node *parent,
+                        struct device_node *prev);
+
+struct device_node *
+omapdss_of_get_next_endpoint(const struct device_node *parent,
+                            struct device_node *prev);
+
+struct device_node *
+omapdss_of_get_first_endpoint(const struct device_node *parent);
+
+struct omap_dss_device *
+omapdss_of_find_source_for_first_ep(struct device_node *node);
+
 #endif