linux-kernel - Re: [PATCH V8 12/13] ptp: Added a clock driver for the IXP46x.

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Message-ID: <m31v4kpkwg.fsf@intrepid.localdomain>
Date:	Mon, 10 Jan 2011 21:24:15 +0100
From:	Krzysztof Halasa <khc@...waw.pl>
To:	Richard Cochran <richardcochran@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
	netdev@...r.kernel.org, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	Christoph Lameter <cl@...ux.com>,
	David Miller <davem@...emloft.net>,
	John Stultz <johnstul@...ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Rodolfo Giometti <giometti@...ux.it>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH V8 12/13] ptp: Added a clock driver for the IXP46x.

Richard Cochran <richardcochran@...il.com> 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
IXP42x).

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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