dfll_fetch_i2c_params(9)

💅 dfll_fetch_i2c_params(9) — the Kernel API Manual, but make it make sense

okay so bestie, welcome to the Kernel API Manual page for dfll_fetch_i2c_params ✨ this is the little function that goes "hey, what are my I2C settings?" and finds out. no cap, it's short, it's sweet, and it's lowkey important. let's get into it 🫶

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🌸 NAME 🌸

dfll_fetch_i2c_params — literally just querying your PMIC I2C params from DT & the regulator subsystem 💖 (yes, both. it's giving "multi-source" main character energy)

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✨ SYNOPSIS ✨

int dfll_fetch_i2c_params(struct tegra_dfll *td);

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🎀 ARGUMENTS 🎀

• td — your DFLL instance 🦋 that's it, that's the whole argument, she's simple and she knows it

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🔥 DESCRIPTION 🔥

okay so here's the vibe: this function reads all the parameters you need for operation in I2C mode ⭐ like, every single one. and where do they come from? two places, bestie:

• the device tree 🌈
• the regulator subsystem 💜

that's the whole job. she fetches, she doesn't judge.

as for how it goes: it returns 0 on success, or -err on failure 😭 so like, check your return value, fr fr. no cap, that minus sign is doing a lot of work.

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👑 SEE ALSO 👑

the whole friend group 💅 (and yes, we're listing everyone, because nobody gets left out at this table):

• Kernel file ./drivers/clk/tegra/clk-dfll.c
• enum dfll_ctrl_mode(9)
• enum dfll_tune_range(9)
• struct dfll_rate_req(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_common_params(9)
• tegra_dfll_register(9)
• tegra_dfll_unregister(9)

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quick vibe check 💀: this page lives at ./drivers/clk/tegra, and she's dated October 2026. screenshot it before it changes, iykyk 📸

and that's the page, bestie 🧚 you ate, you understood the assignment, periodt 💅✨ go read clk-dfll.c — it's iconic, trust 🍓