hwmon: (pmbus/adm1266) add firmware_revision debugfs entry

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The ADM1266 reports its firmware revision via the IC_DEVICE_REV
manufacturer-specific block-read command (0xAE, datasheet Rev. D
Table 80). The first three returned bytes are the firmware
major.minor.patch fields. This is useful when correlating field
behaviour against ADI release notes; expose it through debugfs
alongside the existing sequencer_state entry.

The standard PMBus MFR_REVISION (0x9B) register is already exposed
by pmbus_core's debugfs auto-create path and reports the
manufacturer revision, which is a separate thing from the firmware
running on the device.

Signed-off-by: Abdurrahman Hussain <abdurrahman@nexthop.ai>
Link: https://lore.kernel.org/r/20260512-adm1266-v3-1-a81a479b0bb0@nexthop.ai
[groeck: Squashed patch adding serialization with pmbus_lock]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

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Abdurrahman Hussain 2026-05-12 11:56:24 -07:00 • committed by Guenter Roeck

parent 1000878867

commit 0a31040850

1 changed files with 28 additions and 0 deletions

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drivers/hwmon/pmbus/adm1266.c

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