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of/device: add helper to get cpu device node from logical cpu index 

Multiple drivers need to get the cpu device node from the cpu logical
index and then access the of_node.

This patch adds helper function to fetch the device node directly.

Acked-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
This commit is contained in:
Sudeep KarkadaNagesha 2013-07-18 11:22:04 +01:00
parent f86e4718f2
commit bd00860e96
1 changed files with 15 additions and 0 deletions
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15
include/linux/of_device.h
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@ -1,6 +1,7 @@
#ifndef _LINUX_OF_DEVICE_H
#define _LINUX_OF_DEVICE_H
#include <linux/cpu.h>
#include <linux/platform_device.h>
#include <linux/of_platform.h> /* temporary until merge */
@ -43,6 +44,15 @@ static inline void of_device_node_put(struct device *dev)
of_node_put(dev->of_node);
}
static inline struct device_node *of_cpu_device_node_get(int cpu)
{
struct device *cpu_dev;
cpu_dev = get_cpu_device(cpu);
if (!cpu_dev)
return NULL;
return of_node_get(cpu_dev->of_node);
}
#else /* CONFIG_OF */
static inline int of_driver_match_device(struct device *dev,
@ -67,6 +77,11 @@ static inline const struct of_device_id *of_match_device(
{
return NULL;
}
static inline struct device_node *of_cpu_device_node_get(int cpu)
{
return NULL;
}
#endif /* CONFIG_OF */
#endif /* _LINUX_OF_DEVICE_H */