prcmu_abb_write_masked(9)

💅 prcmu_abb_write_masked 💅

okay so this is a page from the Kernel API Manual, and it's about prcmu_abb_write_masked — literally the function that writes masked register value(s) to the ABB. stay with me bestie, it's actually not that deep 🫶

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✨ SYNOPSIS ✨

int prcmu_abb_write_masked (u8 slave , u8 reg , u8 *value , u8 *mask ,
u8 size );

like, yes, that's a lot of u8s, but we'll get through it together 💖

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🎀 ARGUMENTS 🎀

• slave — the I2C slave address. it's giving "who am I talking to" energy.
• reg — the (start) register address. the starting point, the main character of the address space.
• value — the value(s) you wanna write. your actual payload, slay.
• mask — the mask(s) to use. this is the vibe check for your bits.
• size — the number of registers to write. count 'em.

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🦋 DESCRIPTION 🦋

So what it does: writes masked register value(s) to the ABB. periodt. 🔥

For each value, only the bits set to 1 in the corresponding mask will be written. the other bits are not changed — they stay exactly as they were, no touchy 🙈. so like, the mask is literally choosing which bits get to come to the party 💅

ngl, size has to be 1 for the current firmware version. that's not a suggestion, bestie, that's the rule 😭

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🌈 SEE ALSO 🌈

the kernel file ./drivers/mfd/db8500-prcmu.c and, honestly, a whole friend group of functions:

• prcmu_set_rc_a2p(9)
• prcmu_get_rc_p2a(9)
• prcmu_get_xp70_current_state(9)
• prcmu_config_clkout(9)
• db8500_prcmu_set_arm_opp(9)
• db8500_prcmu_get_arm_opp(9)
• db8500_prcmu_get_ddr_opp(9)
• db8500_prcmu_set_ape_opp(9)
• db8500_prcmu_get_ape_opp(9)
• db8500_prcmu_request_ape_opp_100_voltage(9)
• prcmu_release_usb_wakeup_state(9)
• db8500_prcmu_set_epod(9)
• prcmu_configure_auto_pm(9)
• db8500_prcmu_request_clock(9)
• prcmu_abb_read(9)
• prcmu_abb_write(9)
• prcmu_ac_wake_req(9)
• prcmu_ac_sleep_req(9)
• db8500_prcmu_system_reset(9)
• db8500_prcmu_get_reset_code(9)
• db8500_prcmu_modem_reset(9)

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and that's the whole page, bestie 💜 this masterpiece lives in ./drivers/mfd and it's dated October 2026 — future icon behavior, fr fr. see u in the next prcmu_abb_write_masked(9) 🧚⭐