linux-kernel - [RFC PATCH] clk: add extension API

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Date:	Tue, 29 May 2012 12:58:59 +0300
From:	Peter De Schrijver <pdeschrijver@...dia.com>
To:	Peter De Schrijver <pdeschrijver@...dia.com>
CC:	Mike Turquette <mturquette@...com>,
	Russell King <linux@....linux.org.uk>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
Subject: [RFC PATCH] clk: add extension API

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@...dia.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

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