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Commit 4e7470dd authored by Tomi Valkeinen's avatar Tomi Valkeinen
Browse files

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: default avatarTomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: default avatarArchit Taneja <archit@ti.com>
parent a6ec2164

drivers/video/omap2/dss/Makefile

+1 −1
Original line number Diff line number Diff line 
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

drivers/video/omap2/dss/dss-of.c

0 → 100644
+159 −0
Original line number Diff line number Diff line 
/*

 * 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);

include/video/omapdss.h

+14 −0
Original line number Diff line number Diff line
@@ -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