dfll_disable(9)

💅 dfll_disable — kernel API manual, but make it make sense

okay so bestie, welcome to dfll_disable(9) ✨ this one's short and sweet, which honestly? we love that for us 🫶 it lives in the dfll_disable section of the kernel API manual, and it's literally just "turn the open-loop vibe off and go fully disabled" 🎀

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✨ NAME ✨

dfll_disable — switch from open-loop mode to disabled mode 👑 like, we're leaving the open-loop party and going home (home = DISABLED) 💤

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🌸 SYNOPSIS 🌸

int dfll_disable (struct tegra_dfll *td );

that's it. one arg. no cap. 💅

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🦋 ARGUMENTS 🦋

• td — the DFLL instance 🌈 literally the thing you're disabling, bestie, keep up

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💖 DESCRIPTION 💖

so here's the tea ☕: this function switches the DFLL from the OPEN_LOOP state over to the DISABLED state. that's the whole plot, honestly, main character energy 🎬

it returns 0 upon success ✨ or -EPERM if the DFLL is not currently in open-loop mode 😭 so like, if it's not where it's supposed to be, it's not doing the thing — vibe check failed, no notes 💀

fr fr: -EPERM is not a "permission" problem in the usual sense here, it's just the kernel being dramatic that the mode wasn't right 🙈 don't come for me, that's what the page says.

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👀 SEE ALSO 👀

the whole squad 🫶 and yes, we're listing every single one, because we don't do half-finished here:

• 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_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_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, the whole friend group showed up 🌸 iykyk 💜

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okay that's the page!! 🧚 source lives over in ./drivers/clk/tegra, dated October 2026 ⭐ mwah, go disable some DFLLs responsibly, bestie 💅🔥