STRUCT TI_SCI_PM_OPS(9)

💖 struct ti_sci_pm_ops(9) 💖

okay so bestie, welcome to the Kernel API Manual — yes that's the whole manual name, we're fancy like that ✨ — and today's main character is struct ti_sci_pm_ops, aka the Low Power Mode (LPM) control operations squad. think of it as the friend group that decides when your SoC goes to sleep 😴 and, more importantly, who's allowed to wake it up 💅

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🌸 NAME 🌸

struct ti_sci_pm_ops — Low Power Mode (LPM) control operations. that's it, that's the vibe 🫶

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✨ SYNOPSIS ✨

like, literally the whole struct, no cap:

struct ti_sci_pm_ops {
    int (*lpm_wake_reason)(const struct ti_sci_handle *handle, u32
*source, u64 *timestamp, u8 *pin, u8 *mode);
    int (*set_device_constraint)(const struct ti_sci_handle *handle, u32
id, u8 state);
    int (*set_latency_constraint)(const struct ti_sci_handle *handle,
u16 latency, u8 state);
 };

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🎀 Members 🎀

three function pointers, each one a whole personality:

• lpm_wake_reason — this one's the detective 🔍 it gets you the wake up source that woke the SoC from LPM. like, "who disturbed my nap??" energy fr fr.
  • source: The wake up source that woke soc from LPM.
  • timestamp: Timestamp at which soc woke.
• set_device_constraint — sets an LPM constraint on behalf of a device 🫡 advocating for your device's sleep rights.
  • id: Device Identifier
  • state: The desired state of device constraint: set or clear.
• set_latency_constraint — sets the LPM resume latency constraint ⏱️ i.e. how fast you gotta be able to wake up from low power mode, no exceptions.
  • latency: maximum acceptable latency to wake up from low power mode
  • state: The desired state of latency constraint: set or clear.

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🦋 SEE ALSO 🦋

the whole extended friend group lives in the kernel file ./include/linux/soc/ti/ti_sci_protocol.h — go say hi 👋

• struct ti_sci_version_info(9)
• struct ti_sci_core_ops(9)
• struct ti_sci_dev_ops(9)
• struct ti_sci_clk_ops(9)
• struct ti_sci_resource_desc(9)
• struct ti_sci_rm_core_ops(9)
• struct ti_sci_rm_irq_ops(9)
• struct ti_sci_msg_rm_ring_cfg(9)
• struct ti_sci_rm_ringacc_ops(9)
• struct ti_sci_rm_psil_ops(9)
• struct ti_sci_rm_udmap_ops(9)
• struct ti_sci_proc_ops(9)
• struct ti_sci_ops(9)
• struct ti_sci_handle(9)
• struct ti_sci_resource(9)

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aaaaand that's the page!! 🎉 sourced straight from ./include/linux/soc/ti, dated October 2026 — so go forth, constrain those latencies, and remember: waking the SoC is a privilege, not a right 💅👑 mwah 🫶