ep93xx_spi_dma_prepare(9)

💫 ep93xx_spi_dma_prepare 💫

okay bestie, so this page is from the Kernel API Manual, and it's literally all about one function: ep93xx_spi_dma_prepare. she's giving setup-wizard energy and honestly? iconic. let's get into it 🎀

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✨ NAME ✨

ep93xx_spi_dma_prepare — prepares a DMA transfer 💅

🌸 SYNOPSIS 🌸

struct dma_async_tx_descriptor * ep93xx_spi_dma_prepare (struct
spi_controller *host , enum dma_data_direction dir );

no cap, that's the whole signature. she takes two things and hands you back a descriptor pointer. periodt.

🦋 ARGUMENTS 🦋

• host — the SPI host 🫶
• dir — the DMA transfer direction, iykyk it tells you which way the data's flowing

💖 DESCRIPTION 💖

okay so here's the tea ☕ — this function configures the DMA, maps the buffer, and prepares the DMA descriptor. all three, one function, she's booked and busy.

• if it works? you get a valid DMA descriptor back 🔥
• if it doesn't? you get an ERR_PTR back 💀

so check your pointers, bestie, don't just assume it slayed.

fr fr, ERR_PTR is not a descriptor — vibe check your return value before you use it 🙈

🌈 SEE ALSO 🌈

• Kernel file ./drivers/spi/spi-ep93xx.c 📁
• struct ep93xx_spi(9)
• ep93xx_spi_calc_divisors(9)
• ep93xx_spi_read_write(9)
• ep93xx_spi_dma_finish(9)

the whole friend group, honestly 👑

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and that's the page, bestie 💜 sourced from ./drivers/spi, dated October 2026, living in the Kernel API Manual — go forth and prepare those DMA transfers, you absolute main character 🌟🎀