STRUCT FSL_QDMA_FORMAT(9)

💜 struct fsl_qdma_format(9) 💜

okay bestie, so this page is from the Kernel API Manual and it's all about struct fsl_qdma_format — literally the struct that holds and describes the compound descriptor format for qDMA. that's the whole vibe. 🦋

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✨ NAME ✨

struct fsl_qdma_format — this is the struct holding describing compound descriptor format with qDMA. (yes, that's the official wording, we're not touching it, it's iconic as-is 😌)

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🌸 SYNOPSIS 🌸

struct fsl_qdma_format {
    __le32 status;
    __le32 cfg;
    union {
      struct {
        __le32 addr_lo;
        u8 addr_hi;
        u8 __reserved1[2];
        u8 cfg8b_w1;
      };
      struct {
        __le32 __reserved2;
        __le32 cmd;
      };
      __le64 data;
    };
 };

look at that nesting, it's giving main character energy fr fr 💅

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🎀 Members 🎀

• status — command status plus enqueue status notification. it's the vibe check of the descriptor basically ✨
• cfg — frame offset and frame format. the formatting queen 👑
• {unnamed_union} — anonymous. no name, all mystery 🫶
• {unnamed_struct} — anonymous. also mysterious, also slaying 💫
• addr_lo — holding the compound descriptor of the lower 32-bits address in memory 40-bit address. the low bits are carrying the whole squad ngl 😭
• addr_hi — same as the above member, but point high 8-bits in memory 40-bit address. the high bits said "not me being the upper half" 💀
• __reserved1 — reserved field. reserved for greatness (and for later, but mostly later) 🙈
• cfg8b_w1 — compound descriptor command queue origin produced by qDMA and dynamic debug field. it's lowkey doing two jobs and honestly? obsessed 🌈
• {unnamed_struct} — anonymous. third one, still iconic ⭐
• __reserved2 — reserved field. chilling. unbothered. reserved 💜
• cmd — command for QDMA (see FSL_QDMA_CMD_RWTTYPE and others). the boss of the operation 🔥
• data — pointer to the memory 40-bit address, describes DMA source information and DMA destination information. it ate and left no crumbs 🍓

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🧚 SEE ALSO 🧚

• Kernel file ./drivers/dma/fsl-qdma.c — go read it bestie, it's where all the lore lives 📖✨

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🌸 quick reminder: the two fields marked reserved? they're reserved. don't be out here inventing lore for them, iykyk 😌

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that's the whole page, hope it slayed 💅 from the ./drivers/dma crew, dated October 2026, struct fsl_qdma_format(9) and out 🦋🎀💖