calc_rate(9)

💅 calc_rate(9) — a Kernel API Manual moment 💅

Okay bestie, welcome to the Kernel API Manual; this page is all about calc_rate(9). Grab your iced coffee, we're doing clock math. 🧋✨

🌸 NAME 🌸

calc_rate — calculate rate based on m/n:d values. That's the whole vibe. 💖

✨ SYNOPSIS ✨

       unsigned long calc_rate (unsigned long rate , u32 m , u32 n , u32 mode ,
       u32 hid_div );

No cap, that's the signature. 📝

🎀 ARGUMENTS 🎀

• rate — the parent rate. 💫
• m — the multiplier. ⭐
• n — the divisor</div> 🌈
• mode — use zero to ignore the m/n calculation. Yes, 0 = "not today, m/n." 💅
• hid_div — the pre divisor register value. The pre divisor value relates to hid_div as pre_div = (hid_div + 1) / 2. That relation is iconic, memorize it. 🫶

🔥 DESCRIPTION 🔥

This function returns the calculated rate according to this formula:

       parent_rate     m
       rate = ----------- x  ---
              pre_div       n

So it's literally parent_rate over pre_div, times m over n. Math ate, periodt. 🍓

🦋 SEE ALSO 🦋

• Kernel file ./drivers/clk/qcom/clk-rcg2.c
• convert_to_reg_val(9)
• clk_rcg2_split_div(9)

Go read those next, bestie — the lore continues. 📚✨

This page is brought to you by the ./drivers/clk/qcom source/version, dated October 2026 — calc_rate(9), signing off 💜🎀