regcache_read(9)

💖 regcache_read(9) — the Kernel API Manual, bestie edition 💖

okay so this is a page from the Kernel API Manual, and it's literally about peeking at a register's cached lil value. it's giving "I just want to know what's in there" energy 🎀

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✨ NAME ✨

regcache_read — Fetch the value of a given register from the cache.

like, you point at a register and it hands you back whatever value the cache is holding for it. no cap, that's the whole vibe 🦋

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🌸 SYNOPSIS 🌸

int regcache_read (struct regmap *map , unsigned int reg , unsigned int
*value );

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💅 ARGUMENTS 💅

• map — map to configure. yes bestie, configure — that's what the page says, so that's what we're saying 🫶
• reg — The register index. the lil address of the register you're curious about 👑
• value — The value to be returned. this is where the answer comes back out to you ✨

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🔥 DESCRIPTION 🔥

Return a negative value on failure, 0 on success.

that's it, that's the whole description 😭 if it comes back negative something went sideways, and 0 means you ate and everything's fine. periodt 💀

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🌈 SEE ALSO 🌈

Kernel file ./drivers/base/regmap/regcache.c (iykyk, that's where the source lives ✨), plus these iconic siblings:

• regcache_write(9)
• regcache_sync(9)
• regcache_sync_region(9)
• regcache_drop_region(9)
• regcache_cache_only(9)
• regcache_mark_dirty(9)
• regcache_cache_bypass(9)
• regcache_reg_cached(9)

like a whole friend group of regcache functions, and honestly? obsessed 🧚

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💖 btw the kernel source dir here is ./drivers/base/regmap, this page is dated October 2026, and the whole thing signs off as regcache_read(9) — so yeah, that's the tea 🍓 go read some registers bestie, slay 💜