// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2013 Texas Instruments
 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
 */

#include <linux/device.h>
#include <linux/err.h>
#include <linux/export.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_graph.h>
#include <linux/seq_file.h>

#include <video/omapfb_dss.h>

#include "dss.h"

struct device_node *dss_of_port_get_parent_device(struct device_node *port)
{
        struct device_node *np;
        int i;

        if (!port)
                return NULL;

        np = of_get_parent(port);

        for (i = 0; i < 2 && np; ++i) {
                struct property *prop;

                prop = of_find_property(np, "compatible", NULL);

                if (prop)
                        return np;

                np = of_get_next_parent(np);
        }

        of_node_put(np);
        return NULL;
}

u32 dss_of_port_get_port_number(struct device_node *port)
{
        int r;
        u32 reg;

        r = of_property_read_u32(port, "reg", &reg);
        if (r)
                reg = 0;

        return reg;
}

struct omap_dss_device *
omapdss_of_find_source_for_first_ep(struct device_node *node)
{
        struct device_node *ep;
        struct device_node *src_port;
        struct omap_dss_device *src;

        ep = of_graph_get_endpoint_by_regs(node, 0, -1);
        if (!ep)
                return ERR_PTR(-EINVAL);

        src_port = of_graph_get_remote_port(ep);
        of_node_put(ep);
        if (!src_port)
                return ERR_PTR(-EINVAL);

        src = omap_dss_find_output_by_port_node(src_port);

        of_node_put(src_port);

        return src ? src : ERR_PTR(-EPROBE_DEFER);
}
EXPORT_SYMBOL_GPL(omapdss_of_find_source_for_first_ep);