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clk: abstract parent cache

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Abstract access to the clock parent cache by defining
clk_get_parent_by_index(clk, index). This allows access to parent
clocks from clock drivers.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Cc: Mike Turquette <mturquette@linaro.org>
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Mike Turquette <mturquette@linaro.org>
This commit is contained in:
James Hogan 2013-07-29 12:24:58 +01:00 committed by Mike Turquette
parent 5cfe10bb00
commit 7ef3dcc814
2 changed files with 15 additions and 7 deletions
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21
drivers/clk/clk.c
View File

@ -559,6 +559,19 @@ struct clk *__clk_get_parent(struct clk *clk)
return !clk ? NULL : clk->parent;
}
struct clk *clk_get_parent_by_index(struct clk *clk, u8 index)
{
if (!clk || index >= clk->num_parents)
return NULL;
else if (!clk->parents)
return __clk_lookup(clk->parent_names[index]);
else if (!clk->parents[index])
return clk->parents[index] =
__clk_lookup(clk->parent_names[index]);
else
return clk->parents[index];
}
unsigned int __clk_get_enable_count(struct clk *clk)
{
return !clk ? 0 : clk->enable_count;
@ -1316,13 +1329,7 @@ static struct clk *__clk_init_parent(struct clk *clk)
kzalloc((sizeof(struct clk*) * clk->num_parents),
GFP_KERNEL);
if (!clk->parents)
ret = __clk_lookup(clk->parent_names[index]);
else if (!clk->parents[index])
ret = clk->parents[index] =
__clk_lookup(clk->parent_names[index]);
else
ret = clk->parents[index];
ret = clk_get_parent_by_index(clk, index);
out:
return ret;

1
include/linux/clk-provider.h
View File

@ -420,6 +420,7 @@ const char *__clk_get_name(struct clk *clk);
struct clk_hw *__clk_get_hw(struct clk *clk);
u8 __clk_get_num_parents(struct clk *clk);
struct clk *__clk_get_parent(struct clk *clk);
struct clk *clk_get_parent_by_index(struct clk *clk, u8 index);
unsigned int __clk_get_enable_count(struct clk *clk);
unsigned int __clk_get_prepare_count(struct clk *clk);
unsigned long __clk_get_rate(struct clk *clk);