dfll_init_i2c_if(9)

💅 dfll_init_i2c_if — a Kernel API Manual moment

okay so bestie, we're in the Kernel API Manual today and the main character is dfll_init_i2c_if. yes it's a mouthful, no we're not scared of it 🫶

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✨ NAME ✨

dfll_init_i2c_if — literally just sets up the DFLL's DFLL-I2C interface. that's the whole gig. no cap 💖

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🌸 SYNOPSIS 🌸

void dfll_init_i2c_if (struct tegra_dfll *td );

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🎀 ARGUMENTS 🎀

• td — your DFLL instance. the one and only. give it here 💅

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🦋 DESCRIPTION 🦋

so during DFLL driver initialization, this function programs the DFLL-I2C interface with three(3) little pieces of info, and honestly? they're iconic:

• the PMU slave address
• the vdd register offset
• the transfer mode

and what's it all for, you ask? 👀 the DFLL uses this data to automatically construct I2C voltage-set commands — like, it builds them itself, no hand-holding — and then those commands get passed to the DFLL's internal I2C controller. it's giving self-sufficient. it's giving main character energy. periodt ✨

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🔥 SEE ALSO 🔥

the whole friend group, fr fr — first up, the 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_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 entire group chat, read the whole thread i prom 💜

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ngl bestie this one's short and sweet — no danger flags, no deprecated nonsense, no exit statuses lurking. just vibes and one very well-configured I2C interface 🌈

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and that's the page!! brought to you by ./drivers/clk/tegra and October 2026 — date stamped, sourced, and slaying 💅🎀 see u in the next manpage, mwah 🍓