of_get_cpu_state_node(9)

✨ of_get_cpu_state_node ✨

ok so bestie, we're in the Kernel API Manual today and this one's a lil function called of_get_cpu_state_node — that's the manual name too, iykyk 💅 it lives over in ./drivers/of and it's literally about fetching a CPU's idle state node at whatever index you pass in. come on, let's go 🦋

---

🌸 NAME 🌸

of_get_cpu_state_node — Get CPU's idle state node at the given index

🎀 SYNOPSIS 🎀

struct device_node * of_get_cpu_state_node (const struct device_node
*cpu_node , int index );

💖 ARGUMENTS 💖

• cpu_node — the device node for the CPU 🫶 like, the actual CPU you're asking about
• index — the index in the list of the idle states ✨ so which one in the lineup you want

🔥 DESCRIPTION 🔥

okay so this is the tea ☕ there are two generic methods you can use to describe a CPU's idle states, and they're both valid, no cap:

1. either via a flattened description through the "cpu-idle-states" binding
2. or via the hierarchical layout, using the "power-domains" and the "domain-idle-states" bindings 🌈

This function checks for both of them and returns the idle state node for the requested index. periodt 💅

🦋 RETURN 🦋

An idle state node if found at index. The refcount is incremented for it, so call of_node_put on it when done. 👑 Returns NULL if not found.

bestie don't forget the of_node_put — the refcount is incremented so you gotta release it when you're done, fr fr 🫶

⭐ SEE ALSO ⭐

• Kernel file ./drivers/of/cpu.c
• of_get_cpu_hwid(9)
• of_get_cpu_node(9)
• of_cpu_device_node_get(9)
• of_cpu_node_to_id(9)

---

that's the whole vibe, bestie — 💜 slay 💜 this page is from ./drivers/of, dated October 2026, and yes it's of_get_cpu_state_node(9) all over again, iconic of her honestly 🎀✨