STRUCT SDW_CDNS(9)

💖 NAME 💖

okay so bestie, this is the manual page for struct sdw_cdns(9) — the Cadence driver context — straight out of the Kernel API Manual. iconic little struct energy, honestly. 🎀

✨ SYNOPSIS ✨

here's the whole struct, copied exactly, no edits, periodt:

struct sdw_cdns {
    struct device *dev;
    struct sdw_bus bus;
    unsigned int instance;
    u32 ip_offset;
    u32 response_buf[CDNS_MCP_IP_MAX_CMD_LEN + 2];
    struct completion tx_complete;
    struct sdw_cdns_port *ports;
    int num_ports;
    struct sdw_cdns_streams pcm;
    int pdi_loopback_source;
    int pdi_loopback_target;
    void __iomem *registers;
    bool link_up;
    unsigned int msg_count;
    bool interrupt_enabled;
    struct work_struct work;
    struct delayed_work attach_dwork;
    struct list_head list;
    struct sdw_cdns_dai_runtime **dai_runtime_array;
    struct mutex status_update_lock;
 };

🌸 Members 🌸

okay, vibe check on the members the page actually gives us blurbs for:

• dev — Linux device. the literal device situation. 💻
• bus — Bus handle. yes bestie, the bus. 🚌
• instance — instance number. which one are we, iykyk. 🔢
• ip_offset — version-dependent offset to access IP_MCP registers and fields. version-dependent is doing a lot of work there, ngl. 🌀
• response_buf — SoundWire response buffer. it's giving "hold my response." 📥
• tx_complete — Tx completion. the completion moment. ✨
• ports — Data ports. plural, because we contain multitudes. 🔌
• num_ports — Total number of data ports. the count, the math, the crown. 👑
• pcm — PCM streams. stream girlie behavior. 🌊
• registers — Cadence registers. the register section, no notes. 📋
• link_up — Link status. is the link up? that's the whole mood. 🔗
• msg_count — Messages sent on bus. counting messages like it's a group chat. 💬
• dai_runtime_array — runtime context for each allocated DAI. every allocated DAI gets its lil runtime moment. 🫶
• status_update_lock — protect concurrency between interrupt-based and delayed work status update. the lock is literally protecting the concurrency between interrupt-based and delayed work status update, and we respect her for it. 🔒

and just so we're keeping it a hundred: the synopsis also has pdi_loopback_source, pdi_loopback_target, interrupt_enabled, work, attach_dwork, and list chillin' in the struct. the source page doesn't give those their own separate blurbs, so I'm not inventing any lore. 💅

🦋 SEE ALSO 🦋

• Kernel file ./drivers/soundwire/cadence_master.h: struct sdw_cdns_pdi(9), struct sdw_cdns_streams(9), struct sdw_cdns_stream_config(9), struct sdw_cdns_dai_runtime(9)

that's the whole page, bestie. the footer vibes are: source/version ./drivers/soundwire, date October 2026, and the running footer still says struct sdw_cdns(9). slay and goodbye, manual page. 💜