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Date: Mon, 3 Dec 2018 14:17:56 +0200
From: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
To: mazziesaccount@...il.com, matti.vaittinen@...rohmeurope.com
Cc: mturquette@...libre.com, sboyd@...nel.org, cw00.choi@...sung.com,
krzk@...nel.org, b.zolnierkie@...sung.com, linux@...linux.org.uk,
andy.gross@...aro.org, david.brown@...aro.org, pavel@....cz,
andrew.smirnov@...il.com, lee.jones@...aro.org,
pombredanne@...b.com, sjhuang@...vatar.ai, akshu.agrawal@....com,
djkurtz@...omium.org, rafael.j.wysocki@...el.com,
linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v5 1/9] clkdev: add managed clkdev lookup registration
Clkdev registration lacks of managed registration functions and it
seems few drivers do not drop clkdev lookups at exit. Add
devm_clk_hw_register_clkdev and devm_clk_release_clkdev to ease lookup
releasing at exit.
Signed-off-by: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
---
Documentation/driver-model/devres.txt | 1 +
drivers/clk/clkdev.c | 122 ++++++++++++++++++++++++++--------
include/linux/clkdev.h | 4 ++
3 files changed, 101 insertions(+), 26 deletions(-)
diff --git a/Documentation/driver-model/devres.txt b/Documentation/driver-model/devres.txt
index 43681ca0837f..dbf14326243b 100644
--- a/Documentation/driver-model/devres.txt
+++ b/Documentation/driver-model/devres.txt
@@ -238,6 +238,7 @@ CLOCK
devm_clk_put()
devm_clk_hw_register()
devm_of_clk_add_hw_provider()
+ devm_clk_hw_register_clkdev()
DMA
dmaenginem_async_device_register()
diff --git a/drivers/clk/clkdev.c b/drivers/clk/clkdev.c
index 9ab3db8b3988..68a1e55a60d2 100644
--- a/drivers/clk/clkdev.c
+++ b/drivers/clk/clkdev.c
@@ -401,6 +401,25 @@ static struct clk_lookup *__clk_register_clkdev(struct clk_hw *hw,
return cl;
}
+static int do_clk_register_clkdev(struct clk_hw *hw,
+ struct clk_lookup **cl, const char *con_id, const char *dev_id)
+{
+
+ if (IS_ERR(hw))
+ return PTR_ERR(hw);
+ /*
+ * Since dev_id can be NULL, and NULL is handled specially, we must
+ * pass it as either a NULL format string, or with "%s".
+ */
+ if (dev_id)
+ *cl = __clk_register_clkdev(hw, con_id, "%s",
+ dev_id);
+ else
+ *cl = __clk_register_clkdev(hw, con_id, NULL);
+
+ return *cl ? 0 : -ENOMEM;
+}
+
/**
* clk_register_clkdev - register one clock lookup for a struct clk
* @clk: struct clk to associate with all clk_lookups
@@ -420,20 +439,10 @@ int clk_register_clkdev(struct clk *clk, const char *con_id,
{
struct clk_lookup *cl;
- if (IS_ERR(clk))
- return PTR_ERR(clk);
-
- /*
- * Since dev_id can be NULL, and NULL is handled specially, we must
- * pass it as either a NULL format string, or with "%s".
- */
- if (dev_id)
- cl = __clk_register_clkdev(__clk_get_hw(clk), con_id, "%s",
- dev_id);
- else
- cl = __clk_register_clkdev(__clk_get_hw(clk), con_id, NULL);
-
- return cl ? 0 : -ENOMEM;
+ if (!IS_ERR(clk))
+ return do_clk_register_clkdev(__clk_get_hw(clk), &cl, con_id,
+ dev_id);
+ return PTR_ERR(clk);
}
EXPORT_SYMBOL(clk_register_clkdev);
@@ -456,18 +465,79 @@ int clk_hw_register_clkdev(struct clk_hw *hw, const char *con_id,
{
struct clk_lookup *cl;
- if (IS_ERR(hw))
- return PTR_ERR(hw);
+ return do_clk_register_clkdev(hw, &cl, con_id, dev_id);
+}
+EXPORT_SYMBOL(clk_hw_register_clkdev);
- /*
- * Since dev_id can be NULL, and NULL is handled specially, we must
- * pass it as either a NULL format string, or with "%s".
- */
- if (dev_id)
- cl = __clk_register_clkdev(hw, con_id, "%s", dev_id);
- else
- cl = __clk_register_clkdev(hw, con_id, NULL);
+static void devm_clkdev_release(struct device *dev, void *res)
+{
+ clkdev_drop(*(struct clk_lookup **)res);
+}
- return cl ? 0 : -ENOMEM;
+static int devm_clk_match_clkdev(struct device *dev, void *res, void *data)
+{
+ struct clk_lookup **l = res;
+
+ if (!l || !*l) {
+ WARN_ON(!l || !*l);
+ return 0;
+ }
+ return *l == data;
}
-EXPORT_SYMBOL(clk_hw_register_clkdev);
+
+/**
+ * devm_clk_release_clkdev - Resource managed clkdev lookup release
+ * @dev: device this lookup is bound
+ * @con_id: connection ID string on device
+ * @dev_id: format string describing device name
+ *
+ * Drop the clkdev lookup created with devm_clk_hw_register_clkdev.
+ * Normally this function will not need to be called and the resource
+ * management code will ensure that the resource is freed.
+ */
+void devm_clk_release_clkdev(struct device *dev, const char *con_id,
+ const char *dev_id)
+{
+ struct clk_lookup *cl;
+ int rval;
+
+ cl = clk_find(dev_id, con_id);
+ WARN_ON(!cl);
+ rval = devres_release(dev, devm_clkdev_release,
+ devm_clk_match_clkdev, cl);
+ WARN_ON(rval);
+}
+EXPORT_SYMBOL(devm_clk_release_clkdev);
+
+/**
+ * devm_clk_hw_register_clkdev - managed clk lookup registration for clk_hw
+ * @dev: device this lookup is bound
+ * @hw: struct clk_hw to associate with all clk_lookups
+ * @con_id: connection ID string on device
+ * @dev_id: format string describing device name
+ *
+ * con_id or dev_id may be NULL as a wildcard, just as in the rest of
+ * clkdev.
+ *
+ * To make things easier for mass registration, we detect error clk_hws
+ * from a previous clk_hw_register_*() call, and return the error code for
+ * those. This is to permit this function to be called immediately
+ * after clk_hw_register_*().
+ */
+int devm_clk_hw_register_clkdev(struct device *dev, struct clk_hw *hw,
+ const char *con_id, const char *dev_id)
+{
+ int rval = -ENOMEM;
+ struct clk_lookup **cl;
+
+ cl = devres_alloc(devm_clkdev_release, sizeof(*cl), GFP_KERNEL);
+ if (cl) {
+ rval = do_clk_register_clkdev(hw, cl, con_id, dev_id);
+ if (!rval)
+ devres_add(dev, cl);
+ else
+ devres_free(cl);
+ }
+ return rval;
+}
+EXPORT_SYMBOL(devm_clk_hw_register_clkdev);
diff --git a/include/linux/clkdev.h b/include/linux/clkdev.h
index 4890ff033220..ccb32af5848b 100644
--- a/include/linux/clkdev.h
+++ b/include/linux/clkdev.h
@@ -52,4 +52,8 @@ int clk_add_alias(const char *, const char *, const char *, struct device *);
int clk_register_clkdev(struct clk *, const char *, const char *);
int clk_hw_register_clkdev(struct clk_hw *, const char *, const char *);
+int devm_clk_hw_register_clkdev(struct device *dev, struct clk_hw *hw,
+ const char *con_id, const char *dev_id);
+void devm_clk_release_clkdev(struct device *dev, const char *con_id,
+ const char *dev_id);
#endif
--
2.14.3
--
Matti Vaittinen
ROHM Semiconductors
~~~ "I don't think so," said Rene Descartes. Just then, he vanished ~~~
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