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authorPhilipp Zabel <p.zabel@pengutronix.de>2014-03-07 15:18:47 +0100
committerPhilipp Zabel <philipp.zabel@gmail.com>2014-03-09 19:53:45 +0100
commitb424080a9e086e683ad5fdc624a7cf3c024e0c0f (patch)
tree6d86f5bc6ce43de26819fe65124a346adde6f57e /include/linux
parentfc0a5921561c71be2c334a335c1680f7930434d7 (diff)
reset: Add optional resets and stubs
This patch adds device_reset_optional and (devm_)reset_control_get_optional variants that drivers can use to indicate they can function without control over the reset line. For those functions, stubs are added so the drivers can be compiled with CONFIG_RESET_CONTROLLER disabled. Also, device_reset is annotated with __must_check. Drivers ignoring the return value should use device_reset_optional instead. Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de> Reviewed-by: Maxime Ripard <maxime.ripard@free-electrons.com> Reviewed-by: Marek Vasut <marex@denx.de> Acked-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/reset.h69
1 files changed, 64 insertions, 5 deletions
diff --git a/include/linux/reset.h b/include/linux/reset.h
index a398025d1138..c0eda5023d74 100644
--- a/include/linux/reset.h
+++ b/include/linux/reset.h
@@ -1,21 +1,80 @@
#ifndef _LINUX_RESET_H_
#define _LINUX_RESET_H_
-#include <linux/of.h>
-
struct device;
struct reset_control;
+#ifdef CONFIG_RESET_CONTROLLER
+
int reset_control_reset(struct reset_control *rstc);
int reset_control_assert(struct reset_control *rstc);
int reset_control_deassert(struct reset_control *rstc);
-struct reset_control *of_reset_control_get(struct device_node *node,
- const char *id);
struct reset_control *reset_control_get(struct device *dev, const char *id);
void reset_control_put(struct reset_control *rstc);
struct reset_control *devm_reset_control_get(struct device *dev, const char *id);
-int device_reset(struct device *dev);
+int __must_check device_reset(struct device *dev);
+
+static inline int device_reset_optional(struct device *dev)
+{
+ return device_reset(dev);
+}
+
+static inline struct reset_control *reset_control_get_optional(
+ struct device *dev, const char *id)
+{
+ return reset_control_get(dev, id);
+}
+
+static inline struct reset_control *devm_reset_control_get_optional(
+ struct device *dev, const char *id)
+{
+ return devm_reset_control_get(dev, id);
+}
+
+#else
+
+static inline int reset_control_reset(struct reset_control *rstc)
+{
+ WARN_ON(1);
+ return 0;
+}
+
+static inline int reset_control_assert(struct reset_control *rstc)
+{
+ WARN_ON(1);
+ return 0;
+}
+
+static inline int reset_control_deassert(struct reset_control *rstc)
+{
+ WARN_ON(1);
+ return 0;
+}
+
+static inline void reset_control_put(struct reset_control *rstc)
+{
+ WARN_ON(1);
+}
+
+static inline int device_reset_optional(struct device *dev)
+{
+ return -ENOSYS;
+}
+
+static inline struct reset_control *reset_control_get_optional(
+ struct device *dev, const char *id)
+{
+ return ERR_PTR(-ENOSYS);
+}
+
+static inline struct reset_control *devm_reset_control_get_optional(
+ struct device *dev, const char *id)
+{
+ return ERR_PTR(-ENOSYS);
+}
+
+#endif /* CONFIG_RESET_CONTROLLER */
#endif