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clk: sunxi: improve divider_clk error handling and reporting 

We now report a failing ioremap, failing output names parsing,
failures in table registration and in the final step.
Also there was a bug where clk_register_divider_table() would return
an ERR_PTR value instead of NULL, which we were checking for.
We now implement proper rollback in case of an error.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
This commit is contained in:
Andre Przywara 2016-02-16 10:46:07 +00:00 committed by Maxime Ripard
parent 72360b9116
commit b26803ebfb
1 changed files with 33 additions and 3 deletions
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36
drivers/clk/sunxi/clk-sunxi.c
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@ -805,17 +805,47 @@ static void __init sunxi_divider_clk_setup(struct device_node *node,
void __iomem *reg;
reg = of_iomap(node, 0);
if (!reg) {
pr_err("Could not map registers for mux-clk: %s\n",
of_node_full_name(node));
return;
}
clk_parent = of_clk_get_parent_name(node, 0);
of_property_read_string(node, "clock-output-names", &clk_name);
if (of_property_read_string(node, "clock-output-names", &clk_name)) {
pr_err("%s: could not read clock-output-names from \"%s\"\n",
__func__, of_node_full_name(node));
goto out_unmap;
}
clk = clk_register_divider_table(NULL, clk_name, clk_parent, 0,
reg, data->shift, data->width,
data->pow ? CLK_DIVIDER_POWER_OF_TWO : 0,
data->table, &clk_lock);
if (clk)
of_clk_add_provider(node, of_clk_src_simple_get, clk);
if (IS_ERR(clk)) {
pr_err("%s: failed to register divider clock %s: %ld\n",
__func__, clk_name, PTR_ERR(clk));
goto out_unmap;
}
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);
goto out_unregister;
}
if (clk_register_clkdev(clk, clk_name, NULL)) {
of_clk_del_provider(node);
goto out_unregister;
}
return;
out_unregister:
clk_unregister_divider(clk);
out_unmap:
iounmap(reg);
}
static void __init sun4i_ahb_clk_setup(struct device_node *node)