clk: Make rfree return void

When freeing a clock there is not much we can do if there is an error, and
most callers do not actually check the return value. Even e.g. checking to
make sure that clk->id is valid should have been done in request() in the
first place (unless someone is messing with the driver behind our back).
Just return void and don't bother returning an error.

Signed-off-by: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Link: https://lore.kernel.org/r/20220115222504.617013-2-seanga2@gmail.com

drivers/clk/clk-uclass.c

@@ -481,10 +481,9 @@ int clk_free(struct clk *clk)
 		return 0;
 	ops = clk_dev_ops(clk->dev);
 
-	if (!ops->rfree)
-		return 0;
-
-	return ops->rfree(clk);
+	if (ops->rfree)
+		ops->rfree(clk);
+	return 0;
 }
 
 ulong clk_get_rate(struct clk *clk)

drivers/clk/clk_sandbox.c

@@ -101,15 +101,15 @@ static int sandbox_clk_request(struct clk *clk)
 	return 0;
 }
 
-static int sandbox_clk_free(struct clk *clk)
+static void sandbox_clk_free(struct clk *clk)
 {
 	struct sandbox_clk_priv *priv = dev_get_priv(clk->dev);
 
 	if (clk->id >= SANDBOX_CLK_ID_COUNT)
-		return -EINVAL;
+		return;
 
 	priv->requested[clk->id] = false;
-	return 0;
+	return;
 }
 
 static struct clk_ops sandbox_clk_ops = {

include/clk-uclass.h

@@ -32,7 +32,7 @@ struct clk_ops {
 	int (*of_xlate)(struct clk *clock,
 			struct ofnode_phandle_args *args);
 	int (*request)(struct clk *clock);
-	int (*rfree)(struct clk *clock);
+	void (*rfree)(struct clk *clock);
 	ulong (*round_rate)(struct clk *clk, ulong rate);
 	ulong (*get_rate)(struct clk *clk);
 	ulong (*set_rate)(struct clk *clk, ulong rate);
@@ -81,11 +81,9 @@ int request(struct clk *clock);
  * rfree() - Free a previously requested clock.
  * @clock:	The clock to free.
  *
- * This is the implementation of the client clk_free() API.
- *
- * Return: 0 if OK, or a negative error code.
+ * Free any resources allocated in request().
  */
-int rfree(struct clk *clock);
+void rfree(struct clk *clock);
 
 /**
  * round_rate() - Adjust a rate to the exact rate a clock can provide.