devm_spi_of...est_dma_chan(9)

💅 devm_spi_offload_rx_stream_request_dma_chan — bestie's guide to the RX stream DMA channel

okay so this is a page from the Kernel API Manual (yes, the whole manual, not just this one function, we're being fancy ✨) and it's all about grabbing the DMA channel for the RX stream. let's get into it 🫶

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🌸 NAME 🌸

devm_spi_offload_rx_stream_request_dma_chan — literally just gets you the DMA channel info for the RX stream. that's the whole vibe 💅

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✨ SYNOPSIS ✨

struct dma_chan * devm_spi_offload_rx_stream_request_dma_chan (struct
device *dev , struct spi_offload *offload );

like, look at that signature. iconic. 🎀

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🦋 ARGUMENTS 🦋

• dev — the Device, bestie. it's there for devm purposes (you know, the managed-resource girlies 💖).
• offload — the Offload instance. the main character of this whole operation ngl 👑

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💜 DESCRIPTION 💜

so this is the DMA channel that will receive data from transfers that use the SPI_OFFLOAD_XFER_RX_STREAM offload flag. that's it, that's the tea 🍓

like — you flip on SPI_OFFLOAD_XFER_RX_STREAM, and this is the channel where the incoming data shows up. no cap. 🔥

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🌈 RETURN 🌈

you get a Pointer to DMA channel info — slay 💅 — or a negative error code if things went sideways 😭 (yes, negative error codes, keep an eye out, they're giving red flag energy 🚩).

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👑 SEE ALSO 👑

• Kernel file ./drivers/spi/spi-offload.c (go read it, iykyk 📖)
• devm_spi_offload_alloc(9)
• devm_spi_offload_get(9)
• devm_spi_offload_trigger_get(9)
• spi_offload_trigger_validate(9)
• spi_offload_trigger_enable(9)
• spi_offload_trigger_disable(9)
• devm_spi_offload_tx_stream_request_dma_chan(9) — the TX sibling, we stan a balanced family 🫶
• devm_spi_offload_trigger_register(9)
• spi_offload_trigger_get_priv(9)

all of these are absolute must-reads, fr fr. the whole friend group 💖

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ngl this page lives under ./drivers/spi and it's dated October 2026 — and the manual is the Kernel API Manual, obviously 💅 so yeah, that's the sign-off bestie, go request that DMA channel and slay ✨🎀💜