[Bug 206733] New: i2c i2c-3: i2c-powermac: modalias failure on /uni-n@f8000000/i2c@f8001000/cereal@1c0

https://bugzilla.kernel.org/show_bug.cgi?id=206733

            Bug ID: 206733
           Summary: i2c i2c-3: i2c-powermac: modalias failure on
                    /uni-n@f8000000/i2c@f8001000/cereal@1c0
           Product: Platform Specific/Hardware
           Version: 2.5
    Kernel Version: 5.6-rc4
          Hardware: PPC-32
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: PPC-32
          Assignee: platform_ppc-32@kernel-bugs.osdl.org
          Reporter: erhard_f@mailbox.org
        Regression: No

Created attachment 287759
  --> https://bugzilla.kernel.org/attachment.cgi?id=287759&action=edit
dmesg (5.6-rc4, PowerMac G4 DP)

The G4 MDD/DP can't quite pick up this device, despite it shows up in the
bootlog earlier.

[...]
Mär 02 17:23:45 T600 kernel: i2c-dev: adapter [uni-n 1] registered as minor 3
Mär 02 17:23:45 T600 kernel: i2c i2c-3: adapter [uni-n 1] registered
Mär 02 17:23:45 T600 kernel: PowerMac i2c bus uni-n 1 registered
Mär 02 17:23:45 T600 kernel: i2c i2c-3: i2c-powermac: register
/uni-n@f8000000/i2c@f8001000/cereal@1c0
Mär 02 17:23:45 T600 kernel: i2c i2c-3: i2c-powermac: modalias failure on
/uni-n@f8000000/i2c@f8001000/cereal@1c0
Mär 02 17:23:45 T600 kernel: i2c-dev: adapter [uni-n 0] registered as minor 4
[...]

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--- Comment #1 from Erhard F. (erhard_f@mailbox.org) ---

Created attachment 287761
  --> https://bugzilla.kernel.org/attachment.cgi?id=287761&action=edit
kernel .config (5.6-rc4, PowerMac G4 DP)

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--- Comment #2 from Mathieu Malaterre (mathieu.malaterre@gmail.com) ---

 i2c i2c-3: i2c-powermac: modalias failure on
 /uni-n@f8000000/i2c@f8001000/cereal@1c0

Ben,

Can you confirm this warning is harmless ?

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--- Comment #3 from Benjamin Herrenschmidt (benh@kernel.crashing.org) ---

Yes. I had a look (and had to swap in some historical brain cells from tape
storage :-) But I think the warning should probably be turned into a dev_dbg.
It's probably some gunk in the device-tree but those "cereal" nodes don't
matter (I don't remember what they represent but it's not something we care
about).

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Paul Osmialowski (newchief@king.net.pl) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |newchief@king.net.pl

--- Comment #4 from Paul Osmialowski (newchief@king.net.pl) ---

I've just updated to 5.10.27-gentoo on some old iBook G4, and of course I've
spotted this `i2c-powermac: modalias failure on
/uni-n@f8000000/i2c@f8001000/cereal@1c0` message. It is not worrying now after
I've found Ben's comment. I've also spotted one more error message (Flag
mismatch) that seems new to me, can you also make a judgement if it is also
harmless?:

[...]
[    4.515861] hid-generic 0003:17EF:602E.0001: input,hidraw0: USB HID v1.11
Mouse [USB Optical Mouse] on usb-0001:10:1b.0-1/input0
[    4.660923] input: PowerMac Beep as
/devices/pci0001:10/0001:10:17.0/input/input3
[    4.665549] genirq: Flags mismatch irq 21. 00000001 (i2sbus: i2s-a (tx)) vs.
00000001 (PMac Output)
[...]

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