STRUCT DW_DMA_SLAVE(9)

✨ struct dw_dma_slave — Kernel API Manual ✨

okay so bestie, welcome to the <pink>Kernel API Manual</pink> entry for struct dw_dma_slave, and honestly? it's giving "small struct, big responsibilities" 💅

🌸 NAME 🌸

struct dw_dma_slave — the controller-specific tea about a slave 🫖✨ like, every slay detail the DMA controller needs to know about the peripheral it's about to serve.

🦋 SYNOPSIS 🦋

struct dw_dma_slave {
    struct device           *dma_dev;
    u8 src_id;
    u8 dst_id;
    u8 m_master;
    u8 p_master;
    u8 channels;
    bool hs_polarity;
 };

no cap, that's the whole shape of it 👑 (and yes, keep the fields exactly like that, we do not freestyle struct definitions, that's how you end up crying at 3am 😭)

💖 Members 💖

• dma_dev — the DMA master device. it's required, bestie, non-negotiable, the main character of this field list 👑 if you skip it the whole vibe check fails.
• src_id — the src request line. that's the line your source data rides in on, iconic little u8 🎀
• dst_id — the dst request line. same energy, but for the destination side 🌈
• m_master — the memory master for transfers on the allocated channel. literally who's carrying the memory-side of the transfer 💾✨
• p_master — the peripheral master for transfers on the allocated channel. and this one's the peripheral-side counterpart, they're a matched set fr fr 🫶
• channels — a mask of the channels permitted for allocation. and here's the cute part: a zero value means any channel 🌸 so zero isn't "none", it's "surprise me", lowkey iconic behaviour.
• hs_polarity — sets active low polarity of the handshake interface. tiny bool, big mood, flip it and the handshake signal is active low 🙈

🔥 SEE ALSO 🔥

• Kernel file ./include/linux/platform_data/dma-dw.h
• struct dw_dma_platform_data(9) — go read that one next, it's the sibling, iykyk 💜

and that's the page, bestie!! 🧚 source: ./include/linux/platform_data, dated October 2026 — mwah, go allocate some channels responsibly, struct dw_dma_slave(9) out 💅⭐💖