clk: Inform the core about consumer devices

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>
Cc: Jeffrey Hugo <jhugo@codeaurora.org>
Cc: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

drivers/clk/clk.c

@@ -82,6 +82,7 @@ struct clk_core {
 
 struct clk {
 	struct clk_core	*core;
+	struct device *dev;
 	const char *dev_id;
 	const char *con_id;
 	unsigned long min_rate;
@@ -3273,6 +3274,7 @@ 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
@@ -3281,7 +3283,7 @@ 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;
@@ -3295,6 +3297,7 @@ 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);
@@ -4149,7 +4152,7 @@ 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);
 

drivers/clk/clk.h

@@ -5,6 +5,8 @@
  */
 
 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,
@@ -13,13 +15,14 @@ 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;
 }

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);