regmap_init_w1(9)

💅 regmap_init_w1(9) — the Kernel API Manual page, bestie edition 🎀

okay so like, this is a page from the Kernel API Manual (section 9, the kernel-dev one, iykyk) and it's all about one little function called regmap_init_w1. honestly iconic of it.

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✨ NAME ✨

regmap_init_w1 — initialise register map. that's it, that's the whole job. she shows up, she sets up the regmap, she leaves. main character energy fr fr 💖

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🌸 SYNOPSIS 🌸

regmap_init_w1 (w1_dev , config );

literally just two args bestie, you got this 🫶

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🦋 ARGUMENTS 🦋

• w1_dev — the device that will be interacted with. like, this is the device you're gonna be poking at and talking to. the one in the group chat, so to speak 🔥
• config — the configuration for the register map. all the settings, all the vibes, all the setup info. the outfit the regmap's gonna wear 💅

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👑 DESCRIPTION 👑

so here's the tea: the return value will be an ERR_PTR on error — like, if things go wrong she hands you back an error wrapped up in a pointer, no cap, that's just how it is 😭 — or a valid pointer to a struct regmap if everything slays.

⭐ ngl always check that return value. ERR_PTR is sneaky and she will not announce herself. vibe check your pointers, bestie, that's the whole lesson 🔥

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🌈 SEE ALSO 🌈

okay this list is LONG but we're doing all of it because every single one matters. sitting down? good. hydration check? do it. let's go 💜

kernel file ./include/linux/regmap.h, 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_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), regmap_init_fsi(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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that's the whole page babes, every last crumb of it 🍓

sign-off time: this lil gem lives over in ./include/linux, dated October 2026, and yes it's still called regmap_init_w1(9) — ate and left no crumbs 👑✨🦋