STRUCT DFLL_RATE_REQ(9)

💅 struct dfll_rate_req(9) — bestie edition

okay so this is a page from the Kernel API Manual and it's literally all about struct dfll_rate_req, which is the target DFLL rate request data 🎀 like, this is the little bundle of info that says "hey, here's the frequency we want." no cap. let's get into it ✨

---

✨ NAME ✨

struct dfll_rate_req — target DFLL rate request data 🦋

like, the name says it all honestly. it's the request, it's for the DFLL, and it's full of data. iconic.

---

🌸 SYNOPSIS 🌸

struct dfll_rate_req {
    unsigned long rate;
    unsigned long dvco_target_rate;
    int lut_index;
    u8 mult_bits;
    u8 scale_bits;
 };

that's the whole struct, bestie. five members. she's compact. she's efficient. we stan 💅

---

🔥 Members 🔥

okay so let's go through them one by one because each one is doing her own thing and we respect that:

• rate — target frequency, after the postscaling. periodt.
• dvco_target_rate — target frequency, after the postscaling. yes it also says "after the postscaling," that's literally what the original says, i'm not making this up 🙈
• lut_index — the LUT index at which voltage dvco_target_rate will be reached. so like, which rung on the ladder gets you that rate 🔥
• mult_bits — the value you program into the MULT bits of the DFLL_FREQ_REQ register. it's giving "here's your multiplier, go off."
• scale_bits — the value you program into the SCALE bits of the DFLL_FREQ_REQ register. same energy, different bits ✨

---

👑 SEE ALSO 👑

okay bestie this list is LONG and i need you to stay with me because every single one of these is here for a reason. this struct lives in the Kernel file ./drivers/clk/tegra/clk-dfll.c and it runs with all of these:

• enum dfll_ctrl_mode(9)
• enum dfll_tune_range(9)
• dfll_is_running(9)
• tegra_dfll_runtime_resume(9)
• tegra_dfll_runtime_suspend(9)
• dfll_tune_low(9)
• dfll_scale_dvco_rate(9)
• dfll_set_mode(9)
• dfll_i2c_set_output_enabled(9)
• dfll_pwm_set_output_enabled(9)
• dfll_set_force_output_value(9)
• dfll_set_force_output_enabled(9)
• dfll_force_output(9)
• dfll_load_i2c_lut(9)
• dfll_init_i2c_if(9)
• dfll_init_out_if(9)
• find_lut_index_for_rate(9)
• dfll_calculate_rate_request(9)
• dfll_set_frequency_request(9)
• dfll_request_rate(9)
• dfll_disable(9)
• dfll_enable(9)
• dfll_set_open_loop_config(9)
• dfll_lock(9)
• dfll_unlock(9)
• dfll_register_clk(9)
• dfll_unregister_clk(9)
• dfll_calc_monitored_rate(9)
• dfll_read_monitor_rate(9)
• dfll_set_default_params(9)
• dfll_init_clks(9)
• dfll_init(9)
• tegra_dfll_suspend(9)
• tegra_dfll_resume(9)
• dfll_build_i2c_lut(9)
• read_dt_param(9)
• dfll_fetch_i2c_params(9)
• dfll_fetch_common_params(9)
• tegra_dfll_register(9)
• tegra_dfll_unregister(9)

like. that's the whole friend group. they all hang out together in ./drivers/clk/tegra and honestly their group chat must be chaos 🫶

---

pro tip bestie: if you're touching this struct, you're probably also touching at least three of the functions above. they travel together. it's giving found family 💀

---

and that's the page!! 🌈 you made it to the end, i'm so proud of you. this one's from the Kernel API Manual, living in the <pink>./drivers/clk/tegra</pink> neighborhood, dated October 2026, and catalogued as struct dfll_rate_req(9) — go forth and request some rates, you absolute icon 💖👑⭐