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clk: fix set_rate to clean up cached rates for the hierarchy

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Clock rates are cached within the individual clock nodes, and right now
if one changes a clock rate somewhere in the middle of the tree, none
of its child clocks notice the change. To fix this, clear up all the
cached rates for us and our child clocks.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Tero Kristo <kristo@kernel.org>
This commit is contained in:
Tero Kristo 2021-06-11 11:45:12 +03:00 committed by Lokesh Vutla
parent 1e1fab0be5
commit 6b7fd3128f
1 changed files with 19 additions and 0 deletions
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19
drivers/clk/clk-uclass.c
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@ -568,6 +568,22 @@ ulong clk_round_rate(struct clk *clk, ulong rate)
return ops->round_rate(clk, rate);
}
static void clk_clean_rate_cache(struct clk *clk)
{
struct udevice *child_dev;
struct clk *clkp;
if (!clk)
return;
clk->rate = 0;
list_for_each_entry(child_dev, &clk->dev->child_head, sibling_node) {
clkp = dev_get_clk_ptr(child_dev);
clk_clean_rate_cache(clkp);
}
}
ulong clk_set_rate(struct clk *clk, ulong rate)
{
const struct clk_ops *ops;
@ -580,6 +596,9 @@ ulong clk_set_rate(struct clk *clk, ulong rate)
if (!ops->set_rate)
return -ENOSYS;
/* Clean up cached rates for us and all child clocks */
clk_clean_rate_cache(clk);
return ops->set_rate(clk, rate);
}