clk: socfpga: use of_clk_add_hw_provider and improve error handling

The function of_clk_add_provider() has been deprecated, so use its
suggested replacement of_clk_add_hw_provider() instead.

Since of_clk_add_hw_provider() can fail, like of_clk_add_provider(),
check its return value and do the error handling.

The return type of the init function has been changed to void since
the return value was not used, and the indentation of the parameters has
been aligned to match open parenthesis, as suggested by checkpatch.

The err variable has been renamed rc for consistency.

Signed-off-by: Marco Pagani <marpagan@redhat.com>
Link: https://lore.kernel.org/r/20221209152913.1335068-6-marpagan@redhat.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Author: Marco Pagani

drivers/clk/socfpga/clk-pll.c

@@ -70,8 +70,8 @@ static const struct clk_ops clk_pll_ops = {
 	.get_parent = clk_pll_get_parent,
 };
 
-static __init struct clk_hw *__socfpga_pll_init(struct device_node *node,
-	const struct clk_ops *ops)
+static void __init __socfpga_pll_init(struct device_node *node,
+				      const struct clk_ops *ops)
 {
 	u32 reg;
 	struct clk_hw *hw_clk;
@@ -80,13 +80,13 @@ static __init struct clk_hw *__socfpga_pll_init(struct device_node *node,
 	const char *parent_name[SOCFPGA_MAX_PARENTS];
 	struct clk_init_data init;
 	struct device_node *clkmgr_np;
-	int err;
+	int rc;
 
 	of_property_read_u32(node, "reg", &reg);
 
 	pll_clk = kzalloc(sizeof(*pll_clk), GFP_KERNEL);
 	if (WARN_ON(!pll_clk))
-		return NULL;
+		return;
 
 	clkmgr_np = of_find_compatible_node(NULL, NULL, "altr,clk-mgr");
 	clk_mgr_base_addr = of_iomap(clkmgr_np, 0);
@@ -108,13 +108,25 @@ static __init struct clk_hw *__socfpga_pll_init(struct device_node *node,
 
 	hw_clk = &pll_clk->hw.hw;
 
-	err = clk_hw_register(NULL, hw_clk);
-	if (err) {
-		kfree(pll_clk);
-		return ERR_PTR(err);
+	rc = clk_hw_register(NULL, hw_clk);
+	if (rc) {
+		pr_err("Could not register clock:%s\n", clk_name);
+		goto err_clk_hw_register;
 	}
-	of_clk_add_provider(node, of_clk_src_simple_get, hw_clk);
-	return hw_clk;
+
+	rc = of_clk_add_hw_provider(node, of_clk_hw_simple_get, hw_clk);
+	if (rc) {
+		pr_err("Could not register clock provider for node:%s\n",
+		       clk_name);
+		goto err_of_clk_add_hw_provider;
+	}
+
+	return;
+
+err_of_clk_add_hw_provider:
+	clk_hw_unregister(hw_clk);
+err_clk_hw_register:
+	kfree(pll_clk);
 }
 
 void __init socfpga_pll_init(struct device_node *node)