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of: include errno.h in of_graph.h 

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>
This commit is contained in:
Arnd Bergmann 2016-05-02 12:59:19 +02:00 committed by Rob Herring
parent 1c986e3643
commit 011d6f5c3e
1 changed files with 1 additions and 0 deletions
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include/linux/of_graph.h
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@ -15,6 +15,7 @@
#define __LINUX_OF_GRAPH_H
#include <linux/types.h>
#include <linux/errno.h>
/**
* struct of_endpoint - the OF graph endpoint data structure