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reset: add no-op stubs for optional reset control 

My motivation for this patch is to make reset control handling
optional for generic drivers.

I want to add reset control to drivers/usb/host/ehci-generic.c,
but it is used by several platforms, some will implement a reset
controller driver, some will not.

Add no-op stubs in order to avoid link error for drivers that
implement reset controlling, but still it is optional.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
This commit is contained in:
Masahiro Yamada 2016-09-21 11:29:01 +09:00 committed by Tom Rini
parent 259ede1132
commit 4815db87f5
1 changed files with 32 additions and 0 deletions
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32
include/reset.h
View File

@ -7,6 +7,8 @@
#ifndef _RESET_H
#define _RESET_H
#include <linux/errno.h>
/**
* A reset is a hardware signal indicating that a HW module (or IP block, or
* sometimes an entire off-CPU chip) reset all of its internal state to some
@ -58,6 +60,7 @@ struct reset_ctl {
unsigned long id;
};
#ifdef CONFIG_DM_RESET
/**
* reset_get_by_index - Get/request a reset signal by integer index.
*
@ -132,4 +135,33 @@ int reset_assert(struct reset_ctl *reset_ctl);
*/
int reset_deassert(struct reset_ctl *reset_ctl);
#else
static inline int reset_get_by_index(struct udevice *dev, int index,
struct reset_ctl *reset_ctl)
{
return -ENOTSUPP;
}
static inline int reset_get_by_name(struct udevice *dev, const char *name,
struct reset_ctl *reset_ctl)
{
return -ENOTSUPP;
}
static inline int reset_free(struct reset_ctl *reset_ctl)
{
return 0;
}
static inline int reset_assert(struct reset_ctl *reset_ctl)
{
return 0;
}
static inline int reset_deassert(struct reset_ctl *reset_ctl)
{
return 0;
}
#endif
#endif