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clk: socfpga: Don't have get_parent for single parent ops 

This driver creates a gate clk with the possibility to have multiple
parents. That can cause problems if the common clk framework tries to
call the get_parent() op and gets back a number that's larger than the
number of parents the clk says it supports in
clk_init_data::num_parents. Let's duplicate the clk_ops structure each
time this function is called and drop the get/set parent ops when there
is only one parent. This allows the framework to consider a number
larger than clk_init_data::num_parents as an error condition of the
get_parent() clk op, clearing the way for proper code.

Cc: Jerome Brunet <jbrunet@baylibre.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Dinh Nguyen <dinguyen@opensource.altera.com>
Tested-by: Dinh Nguyen <dinguyen@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
This commit is contained in:
Stephen Boyd 2018-12-04 11:14:02 -08:00
parent 651022382c
commit a30a67be7b
1 changed files with 13 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
drivers/clk/socfpga/clk-gate.c
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@ -176,8 +176,7 @@ static struct clk_ops gateclk_ops = {
.set_parent = socfpga_clk_set_parent,
};
static void __init __socfpga_gate_init(struct device_node *node,
const struct clk_ops *ops)
void __init socfpga_gate_init(struct device_node *node)
{
u32 clk_gate[2];
u32 div_reg[3];
@ -188,12 +187,17 @@ static void __init __socfpga_gate_init(struct device_node *node,
const char *clk_name = node->name;
const char *parent_name[SOCFPGA_MAX_PARENTS];
struct clk_init_data init;
struct clk_ops *ops;
int rc;
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))
return;
rc = of_property_read_u32_array(node, "clk-gate", clk_gate, 2);
if (rc)
clk_gate[0] = 0;
@ -202,8 +206,8 @@ static void __init __socfpga_gate_init(struct device_node *node,
socfpga_clk->hw.reg = clk_mgr_base_addr + clk_gate[0];
socfpga_clk->hw.bit_idx = clk_gate[1];
gateclk_ops.enable = clk_gate_ops.enable;
gateclk_ops.disable = clk_gate_ops.disable;
ops->enable = clk_gate_ops.enable;
ops->disable = clk_gate_ops.disable;
}
rc = of_property_read_u32(node, "fixed-divider", &fixed_div);
@ -234,6 +238,11 @@ static void __init __socfpga_gate_init(struct device_node *node,
init.flags = 0;
init.num_parents = of_clk_parent_fill(node, parent_name, SOCFPGA_MAX_PARENTS);
if (init.num_parents < 2) {
ops->get_parent = NULL;
ops->set_parent = NULL;
}
init.parent_names = parent_name;
socfpga_clk->hw.hw.init = &init;
@ -246,8 +255,3 @@ static void __init __socfpga_gate_init(struct device_node *node,
if (WARN_ON(rc))
return;
}
void __init socfpga_gate_init(struct device_node *node)
{
__socfpga_gate_init(node, &gateclk_ops);
}