[PATCH] reset: provide dummy API entries to avoid link errors

[Barry Song]

this patch provides dummy reset API entries like other subsystem e.g.
gpiolib to avoid link errors when RESET_CONTROLLER is not enabled.

Cc: Philipp Zabel <p.zabel at pengutronix.de>
Cc: Stephen Warren <swarren at nvidia.com>
Signed-off-by: Barry Song <Baohua.Song at csr.com>
---
 include/linux/reset.h |   44 ++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 44 insertions(+), 0 deletions(-)

diff --git a/include/linux/reset.h b/include/linux/reset.h
index 6082247..92bd6fa 100644
--- a/include/linux/reset.h
+++ b/include/linux/reset.h
@@ -4,6 +4,7 @@
 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);
@@ -14,4 +15,47 @@ struct reset_control *devm_reset_control_get(struct device *dev, const char *id)
 
 int device_reset(struct device *dev);
 
+#else /* ! CONFIG_RESET_CONTROLLER */
+
+static inline int reset_control_reset(struct reset_control *rstc)
+{
+	return -ENOSYS;
+}
+
+static inline int reset_control_assert(struct reset_control *rstc);
+{
+	return -ENOSYS;
+}
+
+static inline int reset_control_deassert(struct reset_control *rstc)
+{
+	return -ENOSYS;
+}
+
+static inline struct reset_control *reset_control_get(struct device *dev, const char *id)
+{
+	return -ENOSYS;
+}
+
+static inline void reset_control_put(struct reset_control *rstc)
+{
+	/* reset_control_get never succeed */
+	WARN_ON(1);
+}
+
+static inline struct reset_control *devm_reset_control_get(struct device *dev, const char *id);
+{
+	return -ENOSYS;
+}
+
+static inline int device_reset(struct device *dev)
+{
+	/* device_reset will never really be done */
+	WARN_ON(1);
+
+	return -ENOSYS;
+}
+
+#endif
+
 #endif
-- 
1.7.5.4



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