regmap_field_test_bits(9)

💅 regmap_field_test_bits(9) — the Kernel API Manual, bestie edition 🎀

okay so real talk, we're in the Kernel API Manual today and the star of the show is regmap_field_test_bits(9). yes it's a whole mouthful, no you don't have to say it out loud, but you do have to understand it. it's giving "small function, big feelings" and honestly? iconic.

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✨ NAME ✨

regmap_field_test_bits — bestie's little vibe check for a register field: it checks whether all the bits you asked about are actually set. 🦋

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🌸 SYNOPSIS 🌸

int regmap_field_test_bits (struct regmap_field *field , unsigned int bits );

like, that's it. that's the whole signature. two args, one int coming back at you. slay. 💅

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🎀 ARGUMENTS 🎀

• field — the register field we're operating on. the main character, if you will. 👑
• bits — the bits you wanna test. the little squad you're checking on. ⭐

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💖 DESCRIPTION 💖

so here's the tea ☕ — this function gives you a tri-state answer and honestly it ate:

• it returns a negative errno if the underlying regmap_field_read fails. like, the read itself flopped. 😭
• it returns 0 if at least one of the tested bits is not set. so like, close but not all of them showed up to the party. 💀
• it returns 1 if all tested bits are set. full squad present, everyone slayed. 🔥

ngl that's a lot of meaning packed into one little int, and that's exactly why we respect it. no cap. 🫶

lowkey important: it's all-or-nothing on the 1. one missing bit and you're getting a 0. that's the vibe check, and it is strict. ✨

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🌈 SEE ALSO 🌈

okay this list is LONG, like genuinely a whole group chat of related functions, so let's get through it together. this is the Kernel file ./drivers/base/regmap/regmap.c crew 👇

• 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_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_register_patch(9)
• regmap_get_val_bytes(9)
• regmap_get_max_register(9)
• regmap_get_reg_stride(9)
• regmap_might_sleep(9)

that's the whole roster, nobody left out, we don't do that here 💜

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and that's the page!! this lil masterpiece lives in ./drivers/base/regmap and it's from the Kernel API Manual, dated October 2026 — go off, you absolute legend 🧚‍♀️💅✨🍓