_init(9)

🌸 NAME 🌸

_init — initialize internal data for the hwmod @oh

This is _init(9) from the Kernel API Manual, bestie. We're doing phase-one hwmod setup, and yes, it's giving very internal-data-structures energy. 💖

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✨ SYNOPSIS ✨

int _init (struct omap_hwmod *oh , void *data );

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🎀 ARGUMENTS 🎀

• oh — struct omap_hwmod *
• data — (unused) — literally just vibing in the parameter list, no cap.

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🦋 DESCRIPTION 🦋

Okay so _init looks up the clocks and the address space that the MPU uses to access registers belonging to the hwmod oh. At this point, oh must already be registered — that's the whole prerequisite, periodt. This is the first of two phases for hwmod initialization.

The code called here does not touch any hardware registers. Not a single one. It simply prepares internal data structures, which is honestly iconic of it.

Return vibe check: it returns 0 upon success, or if the hwmod isn't registered, or if the hwmod's address space is not defined. On failure, you get -EINVAL. That's the whole deal. 🫶

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🔥 SEE ALSO 🔥

Kernel file ./arch/arm/mach-omap2/omap_hwmod.c and the whole extended friend group:

• struct clkctrl_provider(9), struct omap_hwmod_reset(9), struct omap_hwmod_soc_ops(9)
• _update_sysc_cache(9), _write_sysconfig(9), _set_master_standbymode(9), _set_slave_idlemode(9), _set_clockactivity(9), _set_softreset(9), _clear_softreset(9), _wait_softreset_complete(9), _set_dmadisable(9), _set_module_autoidle(9), _enable_wakeup(9), _add_initiator_dep(9), _del_initiator_dep(9)
• _init_main_clk(9), _init_interface_clks(9), _init_opt_clks(9), _enable_clocks(9), _omap4_clkctrl_managed_by_clkfwk(9), _omap4_has_clkctrl_clock(9), _disable_clocks(9), _omap4_enable_module(9), _omap4_wait_target_disable(9), _save_mpu_port_index(9), _find_mpu_rt_port(9), _enable_sysc(9), _idle_sysc(9), _shutdown_sysc(9)
• _lookup(9), _init_clkdm(9), _init_clocks(9), _lookup_hardreset(9), _assert_hardreset(9), _deassert_hardreset(9), _read_hardreset(9), _are_all_hardreset_lines_asserted(9), _are_any_hardreset_lines_asserted(9), _omap4_disable_module(9), _ocp_softreset(9), _reset(9), _omap4_update_context_lost(9), _omap4_get_context_lost(9), _enable(9), _idle(9), _shutdown(9)
• of_dev_hwmod_lookup(9), omap_hwmod_fix_mpu_rt_idx(9), omap_hwmod_parse_module_range(9), _init_mpu_rt_base(9), _setup_iclk_autoidle(9), _setup_reset(9), _setup_postsetup(9), _setup(9), _register(9), _add_link(9), _register_link(9)
• _omap2xxx_3xxx_wait_target_ready(9), _omap4_wait_target_ready(9), _omap2_assert_hardreset(9), _omap2_deassert_hardreset(9), _omap2_is_hardreset_asserted(9), _omap4_assert_hardreset(9), _omap4_deassert_hardreset(9), _omap4_is_hardreset_asserted(9), _omap4_disable_direct_prcm(9), _am33xx_deassert_hardreset(9)
• omap_hwmod_softreset(9), omap_hwmod_lookup(9), omap_hwmod_for_each(9), omap_hwmod_register_links(9), _ensure_mpu_hwmod_is_setup(9), omap_hwmod_setup_one(9), omap_hwmod_check_sysc(9), omap_hwmod_init_regbits(9), omap_hwmod_init_reg_offs(9), omap_hwmod_init_sysc_flags(9), omap_hwmod_init_idlemodes(9), omap_hwmod_check_module(9), omap_hwmod_allocate_module(9), omap_hwmod_init_module(9), omap_hwmod_setup_earlycon_flags(9), omap_hwmod_setup_all(9), omap_hwmod_enable(9), omap_hwmod_idle(9), omap_hwmod_shutdown(9), omap_hwmod_get_mpu_rt_va(9), omap_hwmod_assert_hardreset(9), omap_hwmod_deassert_hardreset(9), omap_hwmod_for_each_by_class(9), omap_hwmod_set_postsetup_state(9), omap_hwmod_init(9)

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That's the whole page, bestie. Source/version: ./arch/arm/mach-omap2 · date: October 2026 · manual: _init(9) · Kernel API Manual. Stay hydrated and remember: phase one does not touch hardware registers. 💅✨