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 err variable unnecessarily duplicates the functionality of the
rc variable, so it has been removed.

Signed-off-by: Marco Pagani <marpagan@redhat.com>
Link: https://lore.kernel.org/r/20221209152913.1335068-4-marpagan@redhat.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Author: Marco Pagani

drivers/clk/socfpga/clk-gate.c

@@ -126,17 +126,14 @@ void __init socfpga_gate_init(struct device_node *node)
 	struct clk_init_data init;
 	struct clk_ops *ops;
 	int rc;
-	int err;
 
 	socfpga_clk = kzalloc(sizeof(*socfpga_clk), GFP_KERNEL);
 	if (WARN_ON(!socfpga_clk))
 		return;
 
 	ops = kmemdup(&gateclk_ops, sizeof(gateclk_ops), GFP_KERNEL);
-	if (WARN_ON(!ops)) {
-		kfree(socfpga_clk);
-		return;
-	}
+	if (WARN_ON(!ops))
+		goto err_kmemdup;
 
 	rc = of_property_read_u32_array(node, "clk-gate", clk_gate, 2);
 	if (rc)
@@ -182,13 +179,25 @@ void __init socfpga_gate_init(struct device_node *node)
 
 	hw_clk = &socfpga_clk->hw.hw;
 
-	err = clk_hw_register(NULL, hw_clk);
-	if (err) {
-		kfree(ops);
-		kfree(socfpga_clk);
-		return;
+	rc = clk_hw_register(NULL, hw_clk);
+	if (rc) {
+		pr_err("Could not register clock:%s\n", clk_name);
+		goto err_clk_hw_register;
 	}
-	rc = of_clk_add_provider(node, of_clk_src_simple_get, hw_clk);
-	if (WARN_ON(rc))
-		return;
+
+	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(ops);
+err_kmemdup:
+	kfree(socfpga_clk);
 }