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of: Create of_console_check() for selecting a console specified in /chosen 

The devicetree has a binding for specifying the console device in the
/chosen node, but the kernel doesn't use it consistently. This change
adds an API for testing if a device node is a console, and adds a
preferred console entry if it is.

At the same time this patch removes the of_device_is_stdout_path() API
since it is unused.

Signed-off-by: Grant Likely <grant.likely@linaro.org>
Tested-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Grant Likely 2014-03-27 17:18:55 -07:00
parent a497c3ba1d
commit 3482f2c52b
2 changed files with 15 additions and 12 deletions
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21
drivers/of/base.c
View File

@ -17,6 +17,7 @@
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/console.h>
#include <linux/ctype.h>
#include <linux/cpu.h>
#include <linux/module.h>
@ -2180,20 +2181,22 @@ const char *of_prop_next_string(struct property *prop, const char *cur)
EXPORT_SYMBOL_GPL(of_prop_next_string);
/**
* of_device_is_stdout_path - check if a device node matches the
* linux,stdout-path property
* of_console_check() - Test and setup console for DT setup
* @dn - Pointer to device node
* @name - Name to use for preferred console without index. ex. "ttyS"
* @index - Index to use for preferred console.
*
* Check if this device node matches the linux,stdout-path property
* in the chosen node. return true if yes, false otherwise.
* Check if the given device node matches the stdout-path property in the
* /chosen node. If it does then register it as the preferred console and return
* TRUE. Otherwise return FALSE.
*/
int of_device_is_stdout_path(struct device_node *dn)
bool of_console_check(struct device_node *dn, char *name, int index)
{
if (!of_stdout)
if (!dn || dn != of_stdout || console_set_on_cmdline)
return false;
return of_stdout == dn;
return add_preferred_console(name, index, NULL);
}
EXPORT_SYMBOL_GPL(of_device_is_stdout_path);
EXPORT_SYMBOL_GPL(of_console_check);
/**
* of_find_next_cache_node - Find a node's subsidiary cache

6
include/linux/of.h
View File

@ -352,7 +352,7 @@ const __be32 *of_prop_next_u32(struct property *prop, const __be32 *cur,
*/
const char *of_prop_next_string(struct property *prop, const char *cur);
int of_device_is_stdout_path(struct device_node *dn);
bool of_console_check(struct device_node *dn, char *name, int index);
#else /* CONFIG_OF */
@ -564,9 +564,9 @@ static inline int of_machine_is_compatible(const char *compat)
return 0;
}
static inline int of_device_is_stdout_path(struct device_node *dn)
static inline bool of_console_check(const struct device_node *dn, const char *name, int index)
{
return 0;
return false;
}
static inline const __be32 *of_prop_next_u32(struct property *prop,