regmap_register_patch(9)

💖 NAME 💖

regmap_register_patch — okay so this one registers a bunch of register updates, and then applies them the moment the device gets initialised ✨

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🦋 SYNOPSIS 🦋

int regmap_register_patch (struct regmap *map , const struct
     reg_sequence *regs , int num_regs );

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🎀 ARGUMENTS 🎀

• map — the register map you're applying updates to, bestie 🗺️
• regs — the actual values you wanna update, like the whole shopping list 💅
• num_regs — how many entries are in regs, so it knows when to stop counting 🧮

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🌸 DESCRIPTION 🌸

So what this does is: it registers a set of register updates that get applied to the device every single time the device registers are synchronised with the cache — and then it applies them immediately too. Not me doing double duty 😭✨

The way this is typically used is for applying corrections to the device defaults on startup — like the updates some vendors hand out for undocumented registers (iykyk, the mystery-meat registers 🫶).

⚠️ Big serious caveat, no cap: the caller must make sure this function cannot be called concurrently with either itself or regcache_sync. That's on you, not on the function. Do not test it 💀

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👑 SEE ALSO 👑

Kernel file ./drivers/base/regmap/regmap.c — plus the whole squad, in order, fr fr:

devm_regmap_field_alloc(9), regmap_field_bulk_alloc(9),
devm_regmap_field_bulk_alloc(9), regmap_field_bulk_free(9),
devm_regmap_field_bulk_free(9), devm_regmap_field_free(9),
regmap_field_alloc(9), regmap_field_free(9), regmap_reinit_cache(9),
regmap_exit(9), dev_get_regmap(9), regmap_get_device(9),
regmap_can_raw_write(9), regmap_get_raw_read_max(9),
regmap_get_raw_write_max(9), regmap_write(9), regmap_write_async(9),
regmap_raw_write(9), regmap_noinc_write(9),
regmap_field_update_bits_base(9), regmap_field_test_bits(9),
regmap_fields_update_bits_base(9), regmap_bulk_write(9),
regmap_multi_reg_write(9), regmap_multi_reg_write_bypassed(9),
regmap_raw_write_async(9), regmap_read(9), regmap_read_bypassed(9),
regmap_raw_read(9), regmap_noinc_read(9), regmap_field_read(9),
regmap_fields_read(9), regmap_bulk_read(9), regmap_multi_reg_read(9),
regmap_update_bits_base(9), regmap_test_bits(9),
regmap_async_complete(9), regmap_get_val_bytes(9),
regmap_get_max_register(9), regmap_get_reg_stride(9),
regmap_might_sleep(9)

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That's the whole page, bestie — this little icon lives down in ./drivers/base/regmap, it's from the Kernel API Manual, dated October 2026, and it goes by regmap_register_patch(9). Slay, go forth and patch responsibly 🧚💜