regmap_init_fsi(9)

💅 regmap_init_fsi(9) 💅

okay so this is a page from the Kernel API Manual (yes, the actual kernel API manual, we're fancy now 🎀) and it's about regmap_init_fsi — literally the glow-up moment where your register map gets born. Let's get into it bestie ✨

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🌸 NAME 🌸

regmap_init_fsi — Initialise register map

that's it. that's the whole name. short, sweet, iconic 👑

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✨ SYNOPSIS ✨

regmap_init_fsi (fsi_dev , config );

look at her go. two args, zero drama 🫶

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🎀 ARGUMENTS 🎀

• fsi_dev — the device you're gonna be interacting with 💖 like, who are we even talking to here. that one.
• config — the configuration for the register map. all the settings, all the vibes, all the setup 🌈

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🦋 DESCRIPTION 🦋

okay so here's the tea ☕ — the return value is gonna be one of two things:

• an ERR_PTR if something went wrong 😭 (translation: it errored out, go check it fr fr)
• OR a valid pointer to a struct regmap 👑 (translation: it worked, slay)

that's the whole description. no cap, that's it. lowkey obsessed with how short this is 💀

heads up bestie — always check that return value. ERR_PTR on error, valid pointer to a struct regmap on success. don't be out here dereferencing an error like it's nothing 🙈

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💜 SEE ALSO 💜

the whole friend group showed up for this one, iykyk 💅 start with the kernel file:

• Kernel file ./include/linux/regmap.h

and then, in order, the rest of the crew 🧚:

• struct reg_default(9)
• struct reg_sequence(9)
• regmap_read_poll_timeout(9)
• regmap_read_poll_timeout_atomic(9)
• regmap_field_read_poll_timeout(9)
• struct regmap_range(9)
• struct regmap_access_table(9)
• struct regmap_config(9)
• struct regmap_range_cfg(9)
• struct regmap_sdw_mbq_cfg(9)
• struct regmap_bus(9)
• regmap_init(9)
• regmap_init_i2c(9)
• regmap_init_mdio(9)
• regmap_init_sccb(9)
• regmap_init_slimbus(9)
• regmap_init_spi(9)
• regmap_init_spmi_base(9)
• regmap_init_spmi_ext(9)
• regmap_init_w1(9)
• regmap_init_mmio_clk(9)
• regmap_init_mmio(9)
• regmap_init_ac97(9)
• regmap_init_sdw(9)
• regmap_init_sdw_mbq(9)
• regmap_init_sdw_mbq_cfg(9)
• regmap_init_i3c(9)
• regmap_init_spi_avmm(9)
• devm_regmap_init(9)
• devm_regmap_init_i2c(9)
• devm_regmap_init_mdio(9)
• devm_regmap_init_sccb(9)
• devm_regmap_init_spi(9)
• devm_regmap_init_spmi_base(9)
• devm_regmap_init_spmi_ext(9)
• devm_regmap_init_w1(9)
• devm_regmap_init_mmio_clk(9)
• devm_regmap_init_mmio(9)
• devm_regmap_init_ac97(9)
• devm_regmap_init_sdw(9)
• devm_regmap_init_sdw_mbq(9)
• devm_regmap_init_sdw_mbq_cfg(9)
• devm_regmap_init_slimbus(9)
• devm_regmap_init_i3c(9)
• devm_regmap_init_spi_avmm(9)
• devm_regmap_init_fsi(9)
• struct reg_field(9)
• struct regmap_irq_type(9)
• struct regmap_irq(9)
• struct regmap_irq_chip(9)

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and that's the whole page bestie, go forth and initialise your register maps 🌟

signing off from ./include/linux, version October 2026, on the regmap_init_fsi(9) page — mwah 💋 🎀💖✨