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Subject[PATCH 5/9] clk: Inform the core about consumer devices
Date
We'd like to have a pointer to the device that's consuming a particular
clk in the clk framework so we can link the consumer to the clk provider
with a PM device link. Add a device argument to clk_hw_create_clk() for
this so it can be used in subsequent patches to add and remove the link.

Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Jerome Brunet <jbrunet@baylibre.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Michael Turquette <mturquette@baylibre.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
---
drivers/clk/clk.c | 7 +++++--
drivers/clk/clk.h | 7 +++++--
drivers/clk/clkdev.c | 16 +++++++++++-----
3 files changed, 21 insertions(+), 9 deletions(-)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index d4c4cab42375..73f8a287bf42 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -85,6 +85,7 @@ struct clk_core {

struct clk {
struct clk_core *core;
+ struct device *dev;
const char *dev_id;
const char *con_id;
unsigned long min_rate;
@@ -3323,6 +3324,7 @@ static void free_clk(struct clk *clk)
/**
* clk_hw_create_clk: Allocate and link a clk consumer to a clk_core given
* a clk_hw
+ * @dev: clk consumer device
* @hw: clk_hw associated with the clk being consumed
* @dev_id: string describing device name
* @con_id: connection ID string on device
@@ -3331,7 +3333,7 @@ static void free_clk(struct clk *clk)
* consumers. It connects a consumer to the clk_core and clk_hw structures
* used by the framework and clk provider respectively.
*/
-struct clk *clk_hw_create_clk(struct clk_hw *hw,
+struct clk *clk_hw_create_clk(struct device *dev, struct clk_hw *hw,
const char *dev_id, const char *con_id)
{
struct clk *clk;
@@ -3345,6 +3347,7 @@ struct clk *clk_hw_create_clk(struct clk_hw *hw,
clk = alloc_clk(core, dev_id, con_id);
if (IS_ERR(clk))
return clk;
+ clk->dev = dev;

if (!try_module_get(core->owner)) {
free_clk(clk);
@@ -4161,7 +4164,7 @@ struct clk *of_clk_get_from_provider(struct of_phandle_args *clkspec)
{
struct clk_hw *hw = of_clk_get_hw_from_clkspec(clkspec);

- return clk_hw_create_clk(hw, NULL, __func__);
+ return clk_hw_create_clk(NULL, hw, NULL, __func__);
}
EXPORT_SYMBOL_GPL(of_clk_get_from_provider);

diff --git a/drivers/clk/clk.h b/drivers/clk/clk.h
index cdac6dfa8094..fda0ad483416 100644
--- a/drivers/clk/clk.h
+++ b/drivers/clk/clk.h
@@ -10,6 +10,8 @@
*/

struct clk_hw;
+struct device;
+struct of_phandle_args;

#if defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK)
int of_parse_clkspec(const struct device_node *np, int index, const char *name,
@@ -18,13 +20,14 @@ struct clk_hw *of_clk_get_hw_from_clkspec(struct of_phandle_args *clkspec);
#endif

#ifdef CONFIG_COMMON_CLK
-struct clk *clk_hw_create_clk(struct clk_hw *hw,
+struct clk *clk_hw_create_clk(struct device *dev, struct clk_hw *hw,
const char *dev_id, const char *con_id);
void __clk_put(struct clk *clk);
#else
/* All these casts to avoid ifdefs in clkdev... */
static inline struct clk *
-clk_hw_create_clk(struct clk_hw *hw, const char *dev_id, const char *con_id)
+clk_hw_create_clk(struct device *dev, struct clk_hw *hw, const char *dev_id,
+ const char *con_id)
{
return (struct clk *)hw;
}
diff --git a/drivers/clk/clkdev.c b/drivers/clk/clkdev.c
index 5ebb2119c0b9..f2f4f2afd28c 100644
--- a/drivers/clk/clkdev.c
+++ b/drivers/clk/clkdev.c
@@ -51,7 +51,7 @@ static struct clk *__of_clk_get(struct device_node *np,
{
struct clk_hw *hw = of_clk_get_hw(np, index, con_id);

- return clk_hw_create_clk(hw, dev_id, con_id);
+ return clk_hw_create_clk(NULL, hw, dev_id, con_id);
}

struct clk *of_clk_get(struct device_node *np, int index)
@@ -130,7 +130,8 @@ static struct clk_lookup *clk_find(const char *dev_id, const char *con_id)
return cl;
}

-struct clk *clk_get_sys(const char *dev_id, const char *con_id)
+static struct clk *__clk_get_sys(struct device *dev, const char *dev_id,
+ const char *con_id)
{
struct clk_lookup *cl;
struct clk *clk = NULL;
@@ -141,7 +142,7 @@ struct clk *clk_get_sys(const char *dev_id, const char *con_id)
if (!cl)
goto out;

- clk = clk_hw_create_clk(cl->clk_hw, dev_id, con_id);
+ clk = clk_hw_create_clk(dev, cl->clk_hw, dev_id, con_id);
if (IS_ERR(clk))
cl = NULL;
out:
@@ -149,6 +150,11 @@ struct clk *clk_get_sys(const char *dev_id, const char *con_id)

return cl ? clk : ERR_PTR(-ENOENT);
}
+
+struct clk *clk_get_sys(const char *dev_id, const char *con_id)
+{
+ return __clk_get_sys(NULL, dev_id, con_id);
+}
EXPORT_SYMBOL(clk_get_sys);

struct clk *clk_get(struct device *dev, const char *con_id)
@@ -159,10 +165,10 @@ struct clk *clk_get(struct device *dev, const char *con_id)
if (dev && dev->of_node) {
hw = of_clk_get_hw(dev->of_node, 0, con_id);
if (!IS_ERR(hw) || PTR_ERR(hw) == -EPROBE_DEFER)
- return clk_hw_create_clk(hw, dev_id, con_id);
+ return clk_hw_create_clk(dev, hw, dev_id, con_id);
}

- return clk_get_sys(dev_id, con_id);
+ return __clk_get_sys(dev, dev_id, con_id);
}
EXPORT_SYMBOL(clk_get);

--
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