i3c_readl_fifo(9)

✨ i3c_readl_fifo — read data buffer from a 32bit FIFO 💅

okay so bestie, welcome to the i3c_readl_fifo page from the Kernel API Manual. she's short, she's sweet, and she does exactly one thing, but she does it iconically. let's get into it 🫶

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🌸 SYNOPSIS 🌸

void i3c_readl_fifo (const void __iomem *addr , void *buf , int nbytes );

that's it. that's the whole vibe. one function, three args, returns nothing (void, she's not about to hand you a status code, she just does the thing) ✨

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🎀 ARGUMENTS 🎀

• addr — the FIFO address you're reading from. it's const void __iomem *, so it's an I/O memory pointer and you're not supposed to be scribbling on it, only reading. respect the const, bestie 💖
• buf — pointer to the buffer where the bytes you read get stored. this is your little bucket, the data goes in here 🍓
• nbytes — how many bytes to read. yes, in bytes, even though the FIFO is 32bit. that's the whole point of this helper, iykyk 🔥

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🦋 DESCRIPTION 🦋

so what does this actually do? it reads a data buffer out of a 32bit FIFO. you give it where the FIFO lives, you give it somewhere to put the bytes, you tell it how many bytes you want, and it handles the rest 💅

no cap, the fun part is that it's doing the 32bit-FIFO dance for you — you're working in byte counts (nbytes) while the FIFO is over there living its 32bit life. she bridges that gap so you don't have to. iconic behavior, honestly 👑

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🌈 SEE ALSO 🌈

• the kernel file ./drivers/i3c/internals.h — go read it, it's where the magic is declared 🧚
• i3c_writel_fifo(9) — her sibling!! the "write" to this "read". if you liked reading bytes, you'll love writing them ✨

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ngl, if you're poking around here you're probably deep in the i3c subsystem already — so go check out i3c_writel_fifo(9) too and complete the set 🎀

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that's a wrap, bestie 💜 this one's from the ./drivers/i3c corner of the kernel, and the page dates to October 2026. go read some FIFOs, you've got this 🫶✨