exynos5_dmc_target(9)

✨ exynos5_dmc_target(9) ✨

okay so this is a page from the Kernel API Manual bestie, and it's all about one very specific little function in the Linux kernel 💅

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🎀 NAME 🎀

exynos5_dmc_target — the function that's literally responsible for changing the frequency of the DMC 👑

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🌸 SYNOPSIS 🌸

int exynos5_dmc_target (struct device *dev , unsigned long *freq , u32
flags );

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🦋 ARGUMENTS 🦋

• dev — the device whose frequency is about to get changed, bestie. that's the main character here.
• freq — the frequency you're requesting, in KHz. yes, KHz. read the units, i'm begging 🙈
• flags — flags that came along with this frequency change request. they're just vibing in the passenger seat.

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💖 DESCRIPTION 💖

so this is an entry function that gets handed to the devfreq framework, and its whole job is changing the frequency of the DMC. iconic behaviour, honestly.

here's the tea: the function pulls the possible rate from the OPP table, based on the frequency you requested. then it calls the next function in line — the one actually responsible for the frequency and voltage change. teamwork, fr fr 🫶

and if any of that fails? it does not set 'curr_rate', and it returns an error value back to the framework. no cap, it just tells on itself. no silent failures here 💀

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🌈 SEE ALSO 🌈

the whole friend group, assembled 👑 — plus the kernel file ./drivers/memory/samsung/exynos5422-dmc.c:

• struct dmc_opp_table(9)
• struct exynos5_dmc(9)
• find_target_freq_idx(9)
• exynos5_switch_timing_regs(9)
• exynos5_init_freq_table(9)
• exynos5_set_bypass_dram_timings(9)
• exynos5_dram_change_timings(9)
• exynos5_dmc_align_target_voltage(9)
• exynos5_dmc_align_bypass_voltage(9)
• exynos5_dmc_align_bypass_dram_timings(9)
• exynos5_dmc_switch_to_bypass_configuration(9)
• exynos5_dmc_change_freq_and_volt(9)
• exynos5_dmc_get_volt_freq(9)
• exynos5_counters_get(9)
• exynos5_dmc_start_perf_events(9)
• exynos5_dmc_perf_events_calc(9)
• exynos5_dmc_perf_events_check(9)
• exynos5_dmc_enable_perf_events(9)
• exynos5_dmc_disable_perf_events(9)
• exynos5_dmc_get_status(9)
• exynos5_dmc_get_cur_freq(9)
• exynos5_dmc_align_init_freq(9)
• create_timings_aligned(9)
• of_get_dram_timings(9)
• exynos5_dmc_init_clks(9)
• exynos5_performance_counters_init(9)
• exynos5_dmc_set_pause_on_switching(9)
• exynos5_dmc_probe(9)
• exynos5_dmc_remove(9)

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and that's the whole page, bestie 💜 it lives in ./drivers/memory/samsung, dated October 2026 — so go forth, call the function, respect the error return, and slay ✨🎀🦋