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authorMasahiro Yamada <yamada.masahiro@socionext.com>2016-09-21 02:29:01 (GMT)
committerTom Rini <trini@konsulko.com>2016-09-24 02:25:44 (GMT)
commit4815db87f518ba6d4f070cfbcb6959ea7720775d (patch)
tree3c921d5f5b2bf0539e8383152259cc943d2d4edf /include/reset.h
parent259ede1132724a82327e06808884d4debba6f8eb (diff)
downloadu-boot-4815db87f518ba6d4f070cfbcb6959ea7720775d.tar.xz
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>
Diffstat (limited to 'include/reset.h')
-rw-r--r--include/reset.h32
1 files changed, 32 insertions, 0 deletions
diff --git a/include/reset.h b/include/reset.h
index dc0900f..f45fcf8 100644
--- a/include/reset.h
+++ b/include/reset.h
@@ -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