86 lines
1.8 KiB
C
86 lines
1.8 KiB
C
/*
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* Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com/
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* Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_graph.h>
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#include <linux/seq_file.h>
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#include "omapdss.h"
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struct device_node *dss_of_port_get_parent_device(struct device_node *port)
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{
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struct device_node *np;
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int i;
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if (!port)
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return NULL;
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np = of_get_parent(port);
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for (i = 0; i < 2 && np; ++i) {
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struct property *prop;
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prop = of_find_property(np, "compatible", NULL);
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if (prop)
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return np;
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np = of_get_next_parent(np);
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}
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return NULL;
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}
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u32 dss_of_port_get_port_number(struct device_node *port)
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{
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int r;
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u32 reg;
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r = of_property_read_u32(port, "reg", ®);
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if (r)
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reg = 0;
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return reg;
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}
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struct omap_dss_device *
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omapdss_of_find_source_for_first_ep(struct device_node *node)
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{
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struct device_node *ep;
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struct device_node *src_port;
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struct omap_dss_device *src;
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ep = of_graph_get_endpoint_by_regs(node, 0, 0);
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if (!ep)
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return ERR_PTR(-EINVAL);
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src_port = of_graph_get_remote_port(ep);
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if (!src_port) {
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of_node_put(ep);
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return ERR_PTR(-EINVAL);
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}
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of_node_put(ep);
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src = omap_dss_find_output_by_port_node(src_port);
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of_node_put(src_port);
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return src ? src : ERR_PTR(-EPROBE_DEFER);
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}
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EXPORT_SYMBOL_GPL(omapdss_of_find_source_for_first_ep);
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