linux-kernel - [PATCH] clk: add api to get clk consummer from clk

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Date:   Tue, 19 May 2020 19:04:40 +0200
From:   Jerome Brunet <jbrunet@...libre.com>
To:     Stephen Boyd <sboyd@...nel.org>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc:     Jerome Brunet <jbrunet@...libre.com>, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] clk: add api to get clk consummer from clk_hw

clk_register() is deprecated. Using 'clk' member of struct clk_hw is
discouraged. With this constrainst, it is difficult for driver to
register clocks using the clk_hw API and then use the clock with
the consummer API

This add a simple helper, clk_hw_get_clk(), to get a struct clk from
a struct clk_hw. Like other clk_get() variant, each call to this helper
must be balanced with a call to clk_put().

Cc: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Signed-off-by: Jerome Brunet <jbrunet@...libre.com>
---
 drivers/clk/clk.c            | 17 +++++++++++++++++
 include/linux/clk-provider.h |  1 +
 2 files changed, 18 insertions(+)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 6fd23ce3cb03..d9946e192cbc 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -3625,6 +3625,23 @@ struct clk *clk_hw_create_clk(struct device *dev, struct clk_hw *hw,
 	return clk;
 }
 
+/**
+ * clk_hw_get_clk: get clk consummer given an clk_hw
+ * @hw: clk_hw associated with the clk being consumed
+ *
+ * Returns: new clk consummer
+ * This is the function to be used by providers which need
+ * to get a consummer clk and act on the clock element
+ * Calls to this function must be balanced with calls clk_put()
+ */
+struct clk *clk_hw_get_clk(struct clk_hw *hw)
+{
+	struct device *dev = hw->core->dev;
+
+	return clk_hw_create_clk(dev, hw, dev_name(dev), NULL);
+}
+EXPORT_SYMBOL(clk_hw_get_clk);
+
 static int clk_cpy_name(const char **dst_p, const char *src, bool must_exist)
 {
 	const char *dst;
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index bd1ee9039558..a8f466bdda1a 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -1088,6 +1088,7 @@ static inline struct clk_hw *__clk_get_hw(struct clk *clk)
 	return (struct clk_hw *)clk;
 }
 #endif
+struct clk *clk_hw_get_clk(struct clk_hw *hw);
 unsigned int clk_hw_get_num_parents(const struct clk_hw *hw);
 struct clk_hw *clk_hw_get_parent(const struct clk_hw *hw);
 struct clk_hw *clk_hw_get_parent_by_index(const struct clk_hw *hw,
-- 
2.25.4