clk_set_rate(9)

💖 clk_set_rate — set the clock rate for a clock source 💖

okay so this is a page from the Kernel API Manual (section 9, the kernel-API girlies) and it's literally all about telling a clock "hey bestie, go this fast now" ✨

🌸 SYNOPSIS 🌸

int clk_set_rate (struct clk *clk , unsigned long rate );

🎀 ARGUMENTS 🎀

• clk — the clock source 💅 like, the actual clock you're setting the rate on
• rate — the desired clock rate in Hz, no cap, this is the number you want it to hit

🦋 DESCRIPTION 🦋

so the way this works is kind of iconic actually: updating the rate starts at the top-most affected clock, and then it walks the tree down to the bottom-most clock that needs updating. like a whole little glow-up relay race down the clock tree 🌈✨

It returns success (0) or a negative errno. that's it, that's the vibe — 0 means slay, negative means something went sideways 😭

👑 SEE ALSO 👑

Kernel file ./include/linux/clk.h — and honestly the whole clock friend group showed up for this one, so let's give them their moment 🫶

• clk notifier callback types(9), struct clk_notifier(9), struct clk_notifier_data(9), struct clk_bulk_data(9)
• clk_notifier_register(9), clk_notifier_unregister(9), devm_clk_notifier_register(9)
• clk_get_accuracy(9), clk_set_phase(9), clk_get_phase(9), clk_set_duty_cycle(9), clk_get_scaled_duty_cycle(9), clk_is_match(9)
• clk_rate_exclusive_get(9), devm_clk_rate_exclusive_get(9), clk_rate_exclusive_put(9)
• clk_save_context(9), clk_restore_context(9)
• clk_prepare(9), clk_unprepare(9), clk_is_enabled_when_prepared(9)
• clk_get(9), clk_bulk_get(9), clk_bulk_get_all(9), clk_bulk_get_optional(9)
• devm_clk_bulk_get(9), devm_clk_bulk_get_optional(9), devm_clk_bulk_get_enable(9), devm_clk_bulk_get_optional_enable(9), devm_clk_bulk_get_all(9), devm_clk_bulk_get_all_enabled(9)
• devm_clk_get(9), devm_clk_get_prepared(9), devm_clk_get_enabled(9), devm_clk_get_optional(9), devm_clk_get_optional_prepared(9), devm_clk_get_optional_enabled(9), devm_clk_get_optional_enabled_with_rate(9), devm_get_clk_from_child(9)
• clk_enable(9), clk_bulk_enable(9), clk_disable(9), clk_bulk_disable(9), clk_get_rate(9)
• clk_put(9), clk_bulk_put(9), clk_bulk_put_all(9), devm_clk_put(9)
• clk_round_rate(9), clk_set_rate_exclusive(9), clk_has_parent(9)
• clk_set_rate_range(9), clk_set_min_rate(9), clk_set_max_rate(9)
• clk_set_parent(9), clk_get_parent(9), clk_get_sys(9), clk_drop_range(9), clk_get_optional(9)

and that's the page, bestie 💜 it lives under ./include/linux in the tree, it's the October 2026 edition of the Kernel API Manual, and it's giving "tiny page, huge friend group" energy fr fr 🌟