prcmu_abb_read(9)

💅 prcmu_abb_read(9) — like, the Kernel API Manual era 🎀

okay bestie, so this is a page straight out of the Kernel API Manual and honestly? it's giving tiny-but-mighty. one little function, four arguments, one very specific firmware rule. let's get into it ✨

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🌸 NAME 🌸

prcmu_abb_read — reads register value(s) from the ABB. that's the whole vibe. it reads, it retrieves, it slays 🫶

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⭐ SYNOPSIS ⭐

int prcmu_abb_read (u8 slave , u8 reg , u8 *value , u8 size );

look at her. four params, returns an int, no notes. iconic behavior 💅

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🦋 ARGUMENTS 🦋

• slave — the I2C slave address. yes bestie, that's literally what it's called, that's the name in the source, we don't rename things here 💖
• reg — the (start) register address. like, where the reading begins. the start. the beginning of the lore ✨
• value — the read out value(s). this is where the tea gets poured — it's a pointer, so the good stuff lands out here 🎀
• size — the number of registers to read. how many are we grabbing? that many. no cap 🔥

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💜 DESCRIPTION 💜

so what does she do? she reads register value(s) from the ABB. that's it, that's the job, and she does it well 👑

but here's the part where you gotta pay attention, bestie, because this is a real constraint and not a suggestion: size has to be 1 for the current firmware version. like, one. uno. singular. that's the rule for the firmware as it currently exists, so don't be out here passing 2 and acting surprised 😭

fr fr, size = 1 with the current firmware version. that's the assignment. respect it 🙈

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🌈 SEE ALSO 🌈

the kernel file lives at ./drivers/mfd/db8500-prcmu.c and honestly the whole friend group is here — go say hi to the rest of the PRCMU crew 💖:

• 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_write_masked(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 🧚 she's short, she's sweet, she reads exactly one register at a time on current firmware. this lil gem comes to you from ./drivers/mfd, dated October 2026, and the page itself is prcmu_abb_read(9) — go forth and read responsibly 💜✨🍓