clk_hw_regis...d_rate_kunit(9)

💅 clk_hw_register_fixed_rate_kunit 💅

okay so bestie, this is a Kernel API Manual page, section 9 — and it's genuinely one of those little helper functions that makes testing clock drivers not a whole ordeal. It lives in the kernel, it's doing the most, and it's here to help you test-register a fixed-rate clock. periodt ✨

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🌸 NAME 🌸

clk_hw_register_fixed_rate_kunit — it's the test-managed version of __clk_hw_register_fixed_rate(). like, the same energy, but it knows it's inside a KUnit test and it handles itself accordingly 🎀

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🦋 SYNOPSIS 🦋

struct clk_hw * clk_hw_register_fixed_rate_kunit (struct kunit *test ,
       struct clk_hw_fixed_rate_kunit_params *params );

that's it, that's the whole vibe check. it hands you back a struct clk_hw * — or it doesn't, and we'll get to that 🔥

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✨ ARGUMENTS ✨

• test — your test context 🧚 it's the struct kunit * that tells everything "yes, we're inside a test right now, act accordingly."
• params — the actual arguments that get passed straight through to __clk_hw_register_fixed_rate. lowkey the important one, honestly 🫶

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👑 RETURN 👑

you get back the registered fixed-rate clk_hw — iconic, perfect, exactly what you wanted.

or, if things go sideways, you get an ERR_PTR on failure. so like, always check it bestie, don't just assume. IS_ERR() is your friend fr fr 😭

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🌈 SEE ALSO 🌈

• the kernel file ./drivers/clk/clk-fixed-rate_test.c — that's the whole reason this exists, go read it 📖
• clk_hw_fixed_rate_kunit_params(9) — the struct that params points at, the blueprint of it all 🎀
• clk_hw_unregister_fixed_rate_kunit(9) — the cleanup bestie, because what goes up must come down 💅

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ngl this whole thing is test-only territory — it's built for KUnit so it can do the managed-registration thing. don't be out here using it in production driver code, that's not the assignment 🚫

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and that's the page!! source lives in ./drivers/clk (the kernel tree, obviously), dated October 2026, and this little Kernel API Manual entry was brought to you by that same path — mwah, go write some tests, you're gonna slay 🍓💜