clk: sunxi: improve mux_clk error handling and reporting

We now catch and report a failing ioremap, also a failure in the final
step of the clock registration is now handled and reported.
Also warnings are turned into errors.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

diff --git a/drivers/clk/sunxi/clk-sunxi.c b/drivers/clk/sunxi/clk-sunxi.c
index 99f60efe7b1cc5f41a45d91ebecdbc54d299c4cf..775e13776f84ee892de52b37a36b5cc8f4e0a5af 100644 (file)
--- a/drivers/clk/sunxi/clk-sunxi.c
+++ b/drivers/clk/sunxi/clk-sunxi.c
@@ -674,11 +674,16 @@ static struct clk * __init sunxi_mux_clk_setup(struct device_node *node,
        int i;
 
        reg = of_iomap(node, 0);
+       if (!reg) {
+               pr_err("Could not map registers for mux-clk: %s\n",
+                      of_node_full_name(node));
+               return NULL;
+       }
 
        i = of_clk_parent_fill(node, parents, SUNXI_MAX_PARENTS);
        if (of_property_read_string(node, "clock-output-names", &clk_name)) {
-               pr_warn("%s: could not read clock-output-names for \"%s\"\n",
-                       __func__, clk_name);
+               pr_err("%s: could not read clock-output-names from \"%s\"\n",
+                      __func__, of_node_full_name(node));
                goto out_unmap;
        }
 
@@ -688,15 +693,19 @@ static struct clk * __init sunxi_mux_clk_setup(struct device_node *node,
                               0, &clk_lock);
 
        if (IS_ERR(clk)) {
-               pr_warn("%s: failed to register mux clock %s: %ld\n", __func__,
-                       clk_name, PTR_ERR(clk));
+               pr_err("%s: failed to register mux clock %s: %ld\n", __func__,
+                      clk_name, PTR_ERR(clk));
                goto out_unmap;
        }
 
-       of_clk_add_provider(node, of_clk_src_simple_get, clk);
+       if (of_clk_add_provider(node, of_clk_src_simple_get, clk)) {
+               pr_err("%s: failed to add clock provider for %s\n",
+                      __func__, clk_name);
+               clk_unregister_divider(clk);
+               goto out_unmap;
+       }
 
        return clk;
-
 out_unmap:
        iounmap(reg);
        return NULL;