177 lines
3.2 KiB
C
177 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2013 Texas Instruments
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* Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
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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 <video/omapfb_dss.h>
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#include "dss.h"
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struct device_node *
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omapdss_of_get_next_port(const struct device_node *parent,
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struct device_node *prev)
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{
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struct device_node *port = NULL;
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if (!parent)
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return NULL;
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if (!prev) {
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struct device_node *ports;
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/*
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* It's the first call, we have to find a port subnode
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* within this node or within an optional 'ports' node.
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*/
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ports = of_get_child_by_name(parent, "ports");
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if (ports)
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parent = ports;
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port = of_get_child_by_name(parent, "port");
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/* release the 'ports' node */
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of_node_put(ports);
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} else {
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struct device_node *ports;
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ports = of_get_parent(prev);
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if (!ports)
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return NULL;
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do {
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port = of_get_next_child(ports, prev);
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if (!port) {
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of_node_put(ports);
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return NULL;
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}
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prev = port;
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} while (!of_node_name_eq(port, "port"));
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of_node_put(ports);
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}
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return port;
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}
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EXPORT_SYMBOL_GPL(omapdss_of_get_next_port);
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struct device_node *
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omapdss_of_get_next_endpoint(const struct device_node *parent,
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struct device_node *prev)
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{
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struct device_node *ep = NULL;
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if (!parent)
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return NULL;
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do {
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ep = of_get_next_child(parent, prev);
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if (!ep)
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return NULL;
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prev = ep;
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} while (!of_node_name_eq(ep, "endpoint"));
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return ep;
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}
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EXPORT_SYMBOL_GPL(omapdss_of_get_next_endpoint);
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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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static struct device_node *omapdss_of_get_remote_port(const struct device_node *node)
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{
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struct device_node *np;
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np = of_graph_get_remote_endpoint(node);
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if (!np)
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return NULL;
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np = of_get_next_parent(np);
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return np;
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}
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struct device_node *
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omapdss_of_get_first_endpoint(const struct device_node *parent)
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{
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struct device_node *port, *ep;
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port = omapdss_of_get_next_port(parent, NULL);
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if (!port)
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return NULL;
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ep = omapdss_of_get_next_endpoint(port, NULL);
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of_node_put(port);
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return ep;
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}
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EXPORT_SYMBOL_GPL(omapdss_of_get_first_endpoint);
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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 = omapdss_of_get_first_endpoint(node);
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if (!ep)
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return ERR_PTR(-EINVAL);
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src_port = omapdss_of_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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