@@ -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
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> --- include/reset.h | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+)