[Bug 291810] CPU frequency not reported for Ampere Altra

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=291810

            Bug ID: 291810
           Summary: CPU frequency not reported for Ampere Altra
           Product: Base System
           Version: 15.0-RELEASE
          Hardware: arm64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: arm
          Assignee: [email protected]
          Reporter: [email protected]

Created attachment 266374
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=266374&action=edit
acpidump -t output

Expected:

sysctl dev.cpu.0.freq
reports the actual CPU frequency

Actual:

sysctl dev.cpu.0.freq
sysctl: unknown oid 'dev.cpu.0.freq'

$ sysctl dev.cpu.0
dev.cpu.0.cx_usage_counters: 0
dev.cpu.0.cx_usage: 0.00% last 1000000us
dev.cpu.0.cx_lowest: C1
dev.cpu.0.cx_supported: C1/1/0
dev.cpu.0.%iommu: 
dev.cpu.0.%parent: acpi0
dev.cpu.0.%pnpinfo: _HID=ACPI0007 _UID=6656 _CID=none
dev.cpu.0.%location: handle=\_SB_.SYST.CL1A.C052
dev.cpu.0.%driver: cpu
dev.cpu.0.%desc: ACPI CPU
$

However, dmidecode does show it:

Handle 0x006D, DMI type 4, 48 bytes
Processor Information
        Socket Designation: CPU1
        Type: Central Processor
        Family: ARMv8
        Manufacturer: Ampere(R)
        ID: 01 00 16 0A A1 00 00 00
        Signature: JEP-106 Bank 0x0a Manufacturer 0x16, SoC ID 0x0001, SoC
Revision 0x000000a1
        Version: Ampere(R) Altra(R) Processor
        Voltage: 0.9 V
        External Clock: 1250 MHz
        Max Speed: 2200 MHz
        Current Speed: 2200 MHz
        Status: Populated, Enabled
        Upgrade: None
        L1 Cache Handle: Not Provided
        L2 Cache Handle: Not Provided
        L3 Cache Handle: Not Provided
        Serial Number: 000000000000000090130207033865B0
        Asset Tag: 00000001
        Part Number: Q64-22
        Core Count: 64
        Core Enabled: 64
        Thread Count: 64
        Characteristics:
                64-bit capable
                Multi-Core
                Power/Performance Control
                128-bit Capable
                Arm64 SoC ID

$ dmesg|grep ^acpi0
acpi0: <Ampere Altra>
acpi0: Sleep Button (fixed)
acpi0: Could not update all GPEs: AE_NOT_CONFIGURED

OS: FreeBSD 15.0-RELEASE releng/15.0-n280995-7aedc8de6446 GENERIC arm64

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