pl022_setup(9)

💅 pl022_setup(9) — a Kernel API Manual moment

okay so this is the tea on pl022_setup, straight out of the Kernel API Manual bestie, and honestly? it's giving "quietly important". let's get into it 🫶

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🌸 NAME 🌸

pl022_setup — the setup function that's registered to the SPI host framework. that's it, that's the whole vibe. ✨

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🎀 SYNOPSIS 🎀

int pl022_setup (struct spi_device *spi );

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🦋 ARGUMENTS 🦋

• spi — the spi device that's out here requesting setup. like, it knocked on the door and everything 💅

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⭐ DESCRIPTION ⭐

okay so real talk: this function is registered to the SPI framework for this SPI host controller. yes, that SPI host controller. main character behaviour only 👑

if it's the first time setup is being called by this device, then this function will initialize the runtime state for this chip and save that same runtime state in the device structure. first-call energy, we love to see it 🧚

else (i.e. it's not the first time), it will update the runtime info with the updated chip info. so like, the chip changed its mind and we're just keeping up 😭

and here's the part everyone needs to hear: nothing is really being written to the controller hardware here. nope, not a single bit. that doesn't happen until the actual transfer commences. so don't be out here thinking this function is doing hardware writes, because it is not 🙈

fr fr — no hardware writes at setup time. the hardware gets its moment later, when the transfer actually commences. periodt.

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🔥 SEE ALSO 🔥

• Kernel file ./drivers/spi/spi-pl022.c
• struct vendor_data(9)
• struct pl022(9)
• struct chip_data(9)
• internal_cs_control(9)
• flush(9)
• restore_state(9)
• load_ssp_default_config(9)
• configure_dma(9)
• pl022_interrupt_handler(9)
• pl022_cleanup(9)

like, go read them. they're all in ./drivers/spi/spi-pl022.c and they're all iconic in their own way 💜

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and that's the whole page bestie!! this one's from ./drivers/spi, October 2026, and you can find it filed under pl022_setup(9) — drink some water, read your source files, and slay the day 🌈💖✨