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011d6f5c3e
When CONFIG_OF is disabled, we have to include linux/errno.h before
including of_graph.h, or get build errors like in the newly added
sun4i drm driver:
In file included from ../drivers/gpu/drm/sun4i/sun4i_drv.c:14:0:
include/linux/of_graph.h: In function 'of_graph_parse_endpoint':
include/linux/of_graph.h:58:10: error: 'ENOSYS' undeclared (first use in this function)
A better solution is to ensure that the header can be included
by itself, so let's include linux/errno.h here to fix the error
we just got, and any similar future error.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: 9026e0d122 ("drm: Add Allwinner A10 Display Engine support")
Signed-off-by: Rob Herring <robh@kernel.org>
95 lines
2.8 KiB
C
95 lines
2.8 KiB
C
/*
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* OF graph binding parsing helpers
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*
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* Copyright (C) 2012 - 2013 Samsung Electronics Co., Ltd.
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* Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
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*
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* Copyright (C) 2012 Renesas Electronics Corp.
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* Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*/
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#ifndef __LINUX_OF_GRAPH_H
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#define __LINUX_OF_GRAPH_H
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#include <linux/types.h>
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#include <linux/errno.h>
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/**
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* struct of_endpoint - the OF graph endpoint data structure
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* @port: identifier (value of reg property) of a port this endpoint belongs to
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* @id: identifier (value of reg property) of this endpoint
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* @local_node: pointer to device_node of this endpoint
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*/
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struct of_endpoint {
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unsigned int port;
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unsigned int id;
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const struct device_node *local_node;
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};
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/**
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* for_each_endpoint_of_node - iterate over every endpoint in a device node
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* @parent: parent device node containing ports and endpoints
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* @child: loop variable pointing to the current endpoint node
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*
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* When breaking out of the loop, of_node_put(child) has to be called manually.
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*/
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#define for_each_endpoint_of_node(parent, child) \
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for (child = of_graph_get_next_endpoint(parent, NULL); child != NULL; \
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child = of_graph_get_next_endpoint(parent, child))
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#ifdef CONFIG_OF
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int of_graph_parse_endpoint(const struct device_node *node,
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struct of_endpoint *endpoint);
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struct device_node *of_graph_get_port_by_id(struct device_node *node, u32 id);
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struct device_node *of_graph_get_next_endpoint(const struct device_node *parent,
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struct device_node *previous);
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struct device_node *of_graph_get_endpoint_by_regs(
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const struct device_node *parent, int port_reg, int reg);
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struct device_node *of_graph_get_remote_port_parent(
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const struct device_node *node);
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struct device_node *of_graph_get_remote_port(const struct device_node *node);
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#else
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static inline int of_graph_parse_endpoint(const struct device_node *node,
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struct of_endpoint *endpoint)
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{
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return -ENOSYS;
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}
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static inline struct device_node *of_graph_get_port_by_id(
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struct device_node *node, u32 id)
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{
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return NULL;
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}
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static inline struct device_node *of_graph_get_next_endpoint(
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const struct device_node *parent,
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struct device_node *previous)
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{
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return NULL;
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}
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static inline struct device_node *of_graph_get_endpoint_by_regs(
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const struct device_node *parent, int port_reg, int reg)
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{
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return NULL;
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}
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static inline struct device_node *of_graph_get_remote_port_parent(
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const struct device_node *node)
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{
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return NULL;
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}
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static inline struct device_node *of_graph_get_remote_port(
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const struct device_node *node)
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{
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return NULL;
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}
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#endif /* CONFIG_OF */
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#endif /* __LINUX_OF_GRAPH_H */
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