sdw_write(9)

💖 sdw_write(9) — the kernel API glow-up 💖

okay so you're in the <pink>sdw_write</pink> section of the Kernel API Manual (that's the manual name, bestie, we're in the kernel API docs rn) and honestly? iconic behaviour. this one's a little function with big main character energy — it writes to a SoundWire slave register. let's get into it ✨

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✨ SYNOPSIS ✨

int sdw_write (struct sdw_slave *slave , u32 addr , u8 value );

that's the whole vibe. returns an int, takes three things, slays. 💅

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🎀 ARGUMENTS 🎀

• slave — the SDW Slave. your little guy. the device you're talking to. 🫶
• addr — the Register address, aka where you're poking. 📍
• value — the Register value, aka what you're putting there. 🍓

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🦋 DESCRIPTION 🦋

so here's the tea, and it's literally the whole point: this version of the function will take a PM reference to the slave device. that's it, that's the note. PM reference = taken. no cap. 🔥

ngl this is the with-PM flavour of the write — if you were looking for the no-PM one, keep scrolling down to SEE ALSO, bestie, it's right there 👀

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🌸 SEE ALSO 🌸

the whole friend group, in order, no skipping:

• Kernel file ./drivers/soundwire/bus.c — that's where it lives, periodt. 📂
• sdw_bus_master_add(9)
• sdw_bus_master_delete(9)
• sdw_transfer(9)
• sdw_show_ping_status(9)
• sdw_transfer_defer(9)
• sdw_nread_no_pm(9)
• sdw_nwrite_no_pm(9)
• sdw_write_no_pm(9)
• sdw_read_no_pm(9)
• sdw_nread(9)
• sdw_nwrite(9)
• sdw_read(9)
• sdw_bus_prep_clk_stop(9)
• sdw_bus_clk_stop(9)
• sdw_bus_exit_clk_stop(9)
• sdw_handle_slave_status(9)

like, the entire soundwire roster came to the function's birthday party 😭✨

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<anything else>no wait i'm kidding, that's genuinely the whole page, it's a short one and we love that for it 💀

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okay bye bestie, go write that register 💖 the source is ./drivers/soundwire, it's dated October 2026, and this little gem is filed at sdw_write(9) — you know where to find it 🧚‍♀️⭐