eaaedaf6a1
The omapdss_of_find_source_for_first_ep() function locates the source corresponding to the first endpoint of the first port of a device node. We can easily extend it to locate sinks as well by passing the port number as a parameter. This will be useful to find sinks in encoders drivers. Extend the function and rename it to omapdss_of_find_connected_device() to reflect its new extended purpose. Additionally, it is useful to differentiate between failures to return the connected device because no link exists in the device tree for the requested port, or because the connected device as described in the device tree is invalid or not probed yet. Return NULL in the first case and an error code in the second case, and update the callers accordingly. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
83 lines
2 KiB
C
83 lines
2 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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static struct device_node *
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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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struct omap_dss_device *
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omapdss_of_find_connected_device(struct device_node *node, unsigned int port)
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{
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struct device_node *src_node;
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struct device_node *src_port;
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struct device_node *ep;
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struct omap_dss_device *src;
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u32 port_number = 0;
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/* Get the endpoint... */
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ep = of_graph_get_endpoint_by_regs(node, port, 0);
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if (!ep)
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return NULL;
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/* ... and its remote port... */
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src_port = of_graph_get_remote_port(ep);
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of_node_put(ep);
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if (!src_port)
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return NULL;
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/* ... and the remote port's number and parent... */
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of_property_read_u32(src_port, "reg", &port_number);
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src_node = dss_of_port_get_parent_device(src_port);
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of_node_put(src_port);
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if (!src_node)
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return ERR_PTR(-EINVAL);
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/* ... and finally the connected device. */
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src = omapdss_find_device_by_port(src_node, port_number);
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of_node_put(src_node);
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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_connected_device);
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