STRUCT STEDMA40_CHAN_CFG(9)

💖 struct stedma40_chan_cfg 💖

okay bestie, welcome to the Kernel API Manual entry for struct stedma40_chan_cfg — yes that's the whole name, it's a mouthful, we cope 🫶

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🌸 NAME 🌸

struct stedma40_chan_cfg — literally the Structure to be filled by client drivers. that's it, that's the vibe ✨

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🎀 SYNOPSIS 🎀

here's the whole struct, copy it exactly, no freestyling:

struct stedma40_chan_cfg {
    enum dma_transfer_direction              dir;
    bool high_priority;
    bool realtime;
    enum stedma40_mode                       mode;
    enum stedma40_mode_opt                   mode_opt;
    int dev_type;
    struct stedma40_half_channel_info        src_info;
    struct stedma40_half_channel_info        dst_info;
    bool use_fixed_channel;
    int phy_channel;
 };

look at her. main character struct energy 👑

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🦋 Members 🦋

let's do a member-by-member vibe check, no cap 💅

• dir — the direction, and your options are: MEM 2 MEM, PERIPH 2 MEM, MEM 2 PERIPH, PERIPH 2 PERIPH. pick your fighter 🌈
• high_priority — true if high-priority. simple as that, icon behavior ⭐
• realtime — true if realtime mode is to be enabled. but listen — it's only available on DMA40 version 3+, i.e DB8500v2+. don't come for her if you're on older silicon 😭
• mode — channel mode: physical, logical, or operation. choose wisely 🎀
• mode_opt — options for the chosen channel mode. the little add-ons, the accessories 💜
• dev_type — src/dst device type (driver uses dir to figure out which). she multitasking fr fr 🔥
• src_info — Parameters for dst half channel. yes. that's what it says. we don't question the docs, we just report them 🙈
• dst_info — Parameters for dst half channel. this one's also the dst half channel info. iconic consistency 💀
• use_fixed_channel — if true, use physical channel specified by phy_channel. you're hand-picking, bestie 👑
• phy_channel — physical channel to use, only if use_fixed_channel is true. otherwise she's irrelevant, no shade 🌸

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✨ Description ✨

so here's the tea: this structure has to be filled by the client drivers. it's not optional, it's not a suggestion, it's the assignment 📝

and the recommendation? do all dma configurations for clients in the machine. all of it. get it done in one place, keep it tidy, slay 🧚

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🔥 SEE ALSO 🔥

go read these next, iykyk:

• Kernel file ./drivers/dma/ste_dma40.h struct
• stedma40_half_channel_info(9)

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fr fr read the header file before you touch anything, bestie. the struct definition is right there waiting for you 🫶

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and that's the whole page! source/version lives at ./drivers/dma, dated October 2026, and the page itself is struct stedma40_chan_cfg(9) — bye babes, go fill your structs responsibly 💖✨🎀