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SubjectRe: [PATCH V8 12/13] ptp: Added a clock driver for the IXP46x.
Richard Cochran <> writes:

> But before that, I have a big favor to ask you. Can you please look at
> the TODO in my patch and give me a hint? I don't know how to relate
> the port instance (NPE A,B,C) to the two time stamping channels.

I assume you mean this:
+ * PHYSICAL_ID(p->id) ?
+ * TODO - Figure out correct mapping.

Unfortunately I can's find this information in the devel manual. I think
there are 3 channels (not two), each for one Ethernet port. IXP465 can
have a port on each NPE.

PHYSICAL_ID etc. are described at the start of the file:
* logical port 0x00 0x10 0x20
* NPE 0 (NPE-A) 1 (NPE-B) 2 (NPE-C)
* physical PortId 2 0 1

This means the first port (usually "eth0") is connected to NPE-B, the
second port to NPE-C, and the third port to NPE-A (not available on

Also, the manual says NPE-B can serve 3 additional Ethernet ports
(6 total).

I only have access to IXP425 (and 421) hardware. I think someone with
the actual IXP465 has to check the details.
Krzysztof Halasa

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