snd_soc_dai_set_tdm_slot(9)

📦 version 7.3.1, in nixpkgs unstable

💅 snd_soc_dai_set_tdm_slot(9)

okay so bestie, this is a page from the Kernel API Manual and it's about snd_soc_dai_set_tdm_slot — literally the glow-up your DAI needs to go full TDM mode ✨ grab a strawberry drink and let's get into it 🍓

✨ NAME ✨

snd_soc_dai_set_tdm_slot — configures a DAI for TDM operation 🎀

🌸 SYNOPSIS 🌸

int snd_soc_dai_set_tdm_slot (struct snd_soc_dai *dai , unsigned int
tx_mask , unsigned int rx_mask , int slots , int slot_width );

no cap, that's the whole signature — five args, one int coming back at you 💖

🦋 ARGUMENTS 🦋

  • dai — the DAI you're configuring, i.e. the main character of this whole function 👑
  • tx_mask — bitmask representing active TX slots 🔥
  • rx_mask — bitmask representing active RX slots 🌈
  • slots — number of slots in use
  • slot_width — width in bits for each slot 📏

🧚 DESCRIPTION 🧚

so this function configures the DAI you passed in for TDM operation, periodt ✨

slot contains the total number of slots of the TDM stream, and slot_with the width of each slot in bit clock cycles 🌸 (yes, the manual literally writes slot_with there — not me, not fixing it, copying it exactly, iykyk 💀).

tx_mask and rx_mask are bitmasks specifying the active slots of the TDM stream for the specified DAI — as in, which slots the DAI should write to or read from 🫶. The bit rules, bestie, are giving extremely clean logic:

  • if a bit is set, the corresponding slot is active ✅
  • if a bit is cleared, the corresponding slot is inactive ❌
  • bit 0 maps to the first slot, bit 1 to the second slot, and so on 🔢
  • the first active slot maps to the first channel of the DAI, the second active slot to the second channel, and so on 🎯
🚨 and here's the escape hatch: TDM mode can be disabled by passing 0 for slots. In this case tx_mask, rx_mask and slot_width will be ignored — like, fully ignored, don't even worry about them 🙈

returns 0 on success, a negative error code otherwise 😭 (so 0 = slay, negative = not slay)

💜 SEE ALSO 💜

kernel file ./sound/soc/soc-dai.c plus the whole friend group bestie:

and that's the page babes 🎀 this lil manual lives at ./sound/soc and it's dated October 2026 — screenshot it, cite it, cite me, mwah 💋 go configure some slots 🦋✨

📦 where this page comes from