regcache_sync_region(9)

okay so bestie, this is regcache_sync_region(9) from the Kernel API Manual, and we're about to make register-cache syncing make sense 💖

🌸 NAME 🌸

regcache_sync_region — sync part of the register cache with the hardware. that's the whole vibe 💫

🦋 SYNOPSIS 🦋

here's the signature, copied exactly because we do not mess with code, periodt:

int regcache_sync_region (struct regmap *map , unsigned int min ,
       unsigned int max );

💅 ARGUMENTS 💅

• map — map to sync. the map you're syncing, no cap.
• min — first register to sync.
• max — last register to sync.

✨ DESCRIPTION ✨

Okay so what it actually does: it writes all non-default register values in the specified region to the hardware. yes — all the non-default ones in the region you picked, straight to the hardware ✨

It returns a negative value on failure, and 0 on success. that's the return contract, bestie 🫶

👀 SEE ALSO 👀

Kernel file ./drivers/base/regmap/regcache.c is the spot, and the whole friend group is:

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

okay that's the page! cute footer sign-off: source/version ./drivers/base/regmap • date October 2026 • title regcache_sync_region(9) — mwah, bestie 💋🎀