[RFC PATCH] clk: add extension API

[Peter De Schrijver <pdeschrijver@nvidia.com>]

Add an extension API for clocks. This allows clocktypes to provide extensions
for features which are uncommon and cannot be easily mapped onto normal clock
framework concecpts. eg: resetting blocks, configuring clock phase etc.

Signed-off-by: Peter De Schrijver <pdeschrijver@nvidia.com>
---
 drivers/clk/clk.c            |    8 ++++++++
 include/linux/clk-provider.h |    2 ++
 include/linux/clk.h          |    2 ++
 3 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index e5d5dc1..39bc458 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -956,6 +956,14 @@ struct clk *clk_get_parent(struct clk *clk)
 }
 EXPORT_SYMBOL_GPL(clk_get_parent);
 
+int clk_ext(struct clk *clk, unsigned int op, unsigned long param)
+{
+	if (clk->ops->ext)
+		return clk->ops->ext(clk->hw, op, param);
+
+	return -EINVAL;
+}
+
 /*
  * .get_parent is mandatory for clocks with multiple possible parents.  It is
  * optional for single-parent clocks.  Always call .get_parent if it is
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index 6803fb4..08025d3 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -109,6 +109,8 @@ struct clk_ops {
 	int		(*set_rate)(struct clk_hw *hw, unsigned long,
 				    unsigned long);
 	void		(*init)(struct clk_hw *hw);
+	int		(*ext)(struct clk_hw *hw, unsigned int op,
+					unsigned long param);
 };
 
 /**
diff --git a/include/linux/clk.h b/include/linux/clk.h
index 0e078bd..74be656 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -278,4 +278,6 @@ struct clk *clk_get_sys(const char *dev_id, const char *con_id);
 int clk_add_alias(const char *alias, const char *alias_dev_name, char *id,
 			struct device *dev);
 
+int clk_ext(struct clk *clk, unsigned int op, unsigned long param);
+
 #endif
-- 
1.7.9.1