STRUCT SDW_DP0_PROP(9)

👑 struct sdw_dp0_prop(9) — the DP0 properties glow-up

okay bestie so welcome to the kernel API manual, and today's main character is struct sdw_dp0_prop — literally the struct that holds all the DP0 properties. she's giving humble little struct but she's carrying a whole lot of SoundWire lore, so let's get into it 🫶

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✨ SYNOPSIS ✨

like, here's her whole personality, laid out:

struct sdw_dp0_prop {
    u32 *words;
    u32 max_word;
    u32 min_word;
    u32 num_words;
    u32 ch_prep_timeout;
    bool BRA_flow_controlled;
    bool simple_ch_prep_sm;
    bool imp_def_interrupts;
    int num_lanes;
    u32 *lane_list;
 };

no cap, that's the whole thing 💅

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🎀 Members 🎀

okay so let's meet the cast, one by one, because every single one of them matters:

• words — the wordlengths that are supported. literally the list of them 🌸
• max_word — the maximum number of bits in a Payload Channel Sample. and listen, it's 1 to 64 (inclusive), so don't be out here trying 65, she will not be doing that 💀
• min_word — the minimum number of bits in a Payload Channel Sample. same vibe, also 1 to 64 (inclusive). bookends, your honour 🎀
• num_words — the number of wordlengths that are supported. yes it's a count, yes it's giving very on-the-nose naming, we love a self-explanatory queen ✨
• ch_prep_timeout — a port-specific timeout value, and the unit is milliseconds. write that down bestie ⏱️
• BRA_flow_controlled — the slave implementation results in an OK_NotReady response. iykyk 🙈
• simple_ch_prep_sm — tells you if a channel prepare sequence is required. she's the "do we actually have to do the little dance" flag 🩰
• imp_def_interrupts — if this is set, then each bit corresponds to support for implementation-defined interrupts. bit-by-bit girlies, we stan a bitmask 👑
• num_lanes — the array size of lane_list. she's just here to tell you how long the list is, and honestly? relatable 💜
• lane_list — indicates which Lanes can be used by DP0. the VIP lane guest list 🌈

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💖 Description 💖

so here's the tea: the wordlengths are specified by Spec as max, min AND the number of discrete values. and then the implementation can define based on the wordlengths they support — so like, the spec sets the frame but you get to decorate the room, yk? ✨

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🦋 SEE ALSO 🦋

bestie buckle up, this is a long guest list, but every single one of them is invited to the function, no cuts, no skips, ok? 🫶

Kernel file ./include/linux/soundwire

• enum sdw_slave_status(9)
• enum sdw_clk_stop_type(9)
• enum sdw_command_response(9)
• enum sdw_stream_type(9)
• enum sdw_data_direction(9)
• enum sdw_port_data_mode(9)
• enum sdw_p15_behave(9)
• enum sdw_dpn_type(9)
• enum sdw_clk_stop_mode(9)
• struct sdw_dpn_prop(9)
• struct sdw_slave_prop(9)
• struct sdw_master_prop(9)
• struct sdw_slave_id(9)
• struct sdw_slave_intr_status(9)
• enum sdw_reg_bank(9)
• struct sdw_prepare_ch(9)
• enum sdw_port_prep_ops(9)
• struct sdw_bus_params(9)
• struct sdw_slave_ops(9)
• struct sdw_slave(9)
• struct sdw_master_device(9)
• struct sdw_port_params(9)
• struct sdw_transport_params(9)
• struct sdw_enable_ch(9)
• struct sdw_master_port_ops(9)
• struct sdw_defer(9)
• struct sdw_master_ops(9)
• struct sdw_port_config(9)
• struct sdw_stream_config(9)
• enum sdw_stream_state(9)
• struct sdw_stream_params(9)
• struct sdw_stream_runtime(9)
• struct sdw_bus(9)
• sdw_slave_wait_for_init(9)

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ok that's literally the whole page, no notes, hope this slayed for you 💅

and finally, the cute little sign-off so you know where she lives and when she was born: this one's from ./include/linux/soundwire, dated October 2026, and she answers to struct sdw_dp0_prop(9) — mwah, bye bestie 🍓🧚💜