clk_hw_get_parent_index(9)

🎀 NAME 🎀

Okay so, bestie, this is the Kernel API Manual page for clk_hw_get_parent_index(9) — and it is literally the friend who tells you the parent clock’s index. clk_hw_get_parent_index — returns the index of the parent clock, periodt. 💅

✨ SYNOPSIS ✨

int clk_hw_get_parent_index (struct clk_hw *hw );

🌸 ARGUMENTS 🌸

• hw — the clk_hw associated with the clk being consumed, iykyk 🫶

🦋 DESCRIPTION 🦋

So it fetches and returns the index of the parent clock. That’s the whole vibe. But if the given clock does not have a current parent, it returns -EINVAL — yes, that error, no cap 😭. Not me pretending that detail isn’t important, because it absolutely is.

👑 SEE ALSO 👑

Like, go read this kernel file and then vibe through the whole clk crew, in order, fr fr:

• kernel file ./drivers/clk/clk.c + struct clk_core(9)
• clk_pm_runtime_get_all(9)
• clk_pm_runtime_put_all(9)
• clk_core_get(9)
• clk_determine_rate_noop(9)
• clk_rate_exclusive_put(9)
• clk_rate_exclusive_get(9)
• clk_unprepare(9)
• clk_prepare(9)
• clk_disable(9)
• clk_gate_restore_context(9)
• clk_save_context(9)
• clk_restore_context(9)
• clk_enable(9)
• clk_is_enabled_when_prepared(9)
• clk_hw_init_rate_request(9)
• clk_hw_forward_rate_request(9)
• __clk_determine_rate(9)
• clk_hw_round_rate(9)
• clk_round_rate(9)
• __clk_notify(9)
• __clk_recalc_accuracies(9)
• clk_get_accuracy(9)
• __clk_recalc_rates(9)
• clk_get_rate(9)
• __clk_speculate_rates(9)
• clk_set_rate(9)
• clk_set_rate_exclusive(9)
• clk_set_rate_range(9)
• clk_set_min_rate(9)
• clk_set_max_rate(9)
• clk_get_parent(9)
• clk_has_parent(9)
• clk_set_parent(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_debug_register(9)
• clk_debug_init(9)
• __clk_core_init(9)
• clk_core_link_consumer(9)
• clk_core_unlink_consumer(9)
• alloc_clk(9)
• free_clk(9)
• clk_hw_create_clk(9)
• clk_hw_get_clk(9)
• dev_or_parent_of_node(9)
• clk_register(9)
• clk_hw_register(9)
• clk_unregister(9)
• clk_hw_unregister(9)
• devm_clk_register(9)
• devm_clk_hw_register(9)
• devm_clk_hw_get_clk(9)
• clk_notifier_register(9)
• clk_notifier_unregister(9)
• struct of_clk_provider(9)
• of_clk_add_provider(9)
• of_clk_add_hw_provider(9)
• devm_of_clk_add_hw_provider(9)
• of_clk_del_provider(9)
• of_parse_clkspec(9)
• of_clk_get_from_provider(9)
• of_clk_get_by_name(9)
• of_clk_get_parent_count(9)
• of_clk_parent_fill(9)
• of_clk_detect_critical(9)
• of_clk_init(9)

Signed off from the ./drivers/clk source corner, October 2026, the clk_hw_get_parent_index(9) manual-page edition — mwah 💋✨