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# SPDX-License-Identifier: MIT
import struct
from ..utils import *
from .spmi import SPMI
__all__ = ["PMU"]
class PMU:
def __init__(self, u, adt_path=None):
self.u = u
if adt_path is None:
adt_path = PMU.find_primary_pmu(u.adt)
self.node = u.adt[adt_path]
self.spmi = SPMI(u, adt_path.rpartition('/')[0])
self.adt_path = adt_path
self.primary = u.adt[adt_path].is_primary == 1
self.reg = u.adt[adt_path].reg[0]
def reset_panic_counter(self):
if self.primary:
leg_scrpad = self.node.info_leg__scrpad[0]
self.spmi.write8(self.reg, leg_scrpad + 2, 0) # error counts
@staticmethod
def find_primary_pmu(adt):
for child in adt["/arm-io"]:
if child.name.startswith("nub-spmi"):
for pmu in child:
compat = getattr(pmu, "compatible")[0] if hasattr(pmu, "compatible") else "unset"
primary = (getattr(pmu, "is-primary") == 1) if hasattr(pmu, "is-primary") else False
if compat == "pmu,spmi" and primary:
return pmu._path.removeprefix('/device-tree')
raise KeyError(f"primary 'pmu,spmi' node not found")
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