spi_nor_writ...volatile_reg(9)

📦 version 7.3.1, in nixpkgs unstable

💅 spi_nor_writ...volatile_reg(9) — a whole Kernel API Manual moment ✨

okay bestie, buckle up, because we're diving into the Kernel API Manual and this one is genuinely so cute and small, you're gonna eat it up 🍓

🌸 NAME 🌸

spi_nor_write_any_volatile_reg — write any volatile register to flash memory, that's the whole vibe, no cap 💖

✨ SYNOPSIS ✨

int spi_nor_write_any_volatile_reg (struct spi_nor *nor , struct
spi_mem_op *op , enum spi_nor_protocol proto );

like, look at her. three args, one int return, main character energy fr fr 👑

🦋 ARGUMENTS 🦋

  • nor — pointer to struct spi_nor, the little handle on your whole flash situation 🫶
  • op — the SPI memory operation. and listen, op->data.buf must be DMA-able. not "probably fine", not "we'll see" — DMA-able. periodt 💀
  • proto — the SPI protocol you're using for the register operation. pick one, live your truth 🎀

🔥 DESCRIPTION 🔥

so the tea is: writing volatile registers is instant according to some manufacturers — and the manpage is out here naming names: Cypress and Micron. so iconic of them 💅

and because it's instant, there's literally no status polling needed. none. zero. not me refreshing a status register for nothing 😭

⭐ RETURN ⭐

zero on success, -errno otherwise. that's it, that's the check 🌈

👑 SEE ALSO 👑

and now the friend group, because this function does not roll alone — here's the entire squad, plus the kernel file where the magic lives: ./drivers/mtd/spi-nor/core.c 🧚

like I said — the whole squad 🫶💜

ok and before I go: that op->data.buf DMA-able thing from up top? not a suggestion bestie, it's giving hard requirement 🙈

so yeah, that's the page! brought to you by ./drivers/mtd/spi-nor in October 2026 — mwah, love u, go write some volatile registers responsibly 💖✨🎀

📦 where this page comes from