zynq_qspi_init_hw(9)

📦 version 7.3.1, in nixpkgs unstable

💜 zynq_qspi_init_hw(9) 💜

okay so welcome to the Kernel API Manual bestie, we're looking at zynq_qspi_init_hw(9) today and honestly? she's a glow-up function. no cap. 💅

✨ NAME ✨

zynq_qspi_init_hw — Initialize the hardware 🎀

Like, the actual "wake up and get dressed" of the QSPI controller. We're not doing the data transfer, we're setting the whole vibe first. 💖

🦋 SYNOPSIS 🦋

void zynq_qspi_init_hw (struct zynq_qspi *xqspi , unsigned int num_cs );

returns nothing (void), takes two things, iconic, minimal, ate. ⭐

🌸 ARGUMENTS 🌸

  • xqspi — a pointer to the struct zynq_qspi structure, i.e. your main character. Everything happens through her. 🫶
  • num_cs — the number of connected CS, and before you ask, yes this is so it can enable dual memories if needed. bestie's got range. ✨

💖 DESCRIPTION 💖

🌈 the reset-era defaults (iykyk)

so when the QSPI controller resets, these are the default settings of her configurable parameters, and honestly the factory settings are giving "first day of school". 😭

  • Host mode
  • Baud rate divisor is set to 2
  • Tx threshold set to 1l Rx threshold set to 32
  • Flash memory interface mode enabled
  • Size of the word to be transferred as 8 bit
yes bestie that's a lowercase l in 1l in the original docs — we don't ask questions, we just transcribe faithfully 💀

👑 what this function actually does

This function performs the following actions, and the way she runs down the list is very main character energy:

  • Disable and clear all the interrupts
  • Enable manual target select
  • Enable manual start
  • Deselect all the chip select lines
  • Set the size of the word to be transferred as 32 bit
  • Set the little endian mode of TX FIFO and
  • Enable the QSPI controller

periodt. eight-bit word in, thirty-two-bit word out, interrupts off, chip selects politely deselected. it's giving competence. 🔥

🧚 SEE ALSO 🧚

Kernel file ./drivers/spi/spi-zynq-qspi.c and the whole friend group:

go read them all, they're literally all connected, the lore is deep 📚✨

mwah 💋 that's the page! brought to you by ./drivers/spi, dated October 2026, and filed under zynq_qspi_init_hw(9) — drink some water, read your kernel source, love u bye 🫶💜

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