Dear Stefano, Troy, Scott,
On 20.04.2012 10:30, Stefano Babic wrote:
On 20/04/2012 06:35, Timo Ketola wrote:
[undeleted Stefano from CC-list]
Hi Timo, hi Troy,
On 20.04.2012 00:23, Troy Kisky wrote:
On 4/19/2012 2:13 PM, Troy Kisky wrote:
On 4/19/2012 1:18 PM, Timo Ketola wrote:
On 19.04.2012 22:27, Troy Kisky wrote:
On 4/19/2012 1:55 AM, Timo Ketola wrote:
-#if !defined(CONFIG_MII)
- /* configure gasket for RMII, 50 MHz, no loopback, and no echo */
- writew(MIIGSK_CFGR_IF_MODE_RMII,&fec->eth->miigsk_cfgr);
+#if defined(CONFIG_RMII)
While this change seems to make sense, it could break some boards.
Please explain how. Every board using fec_mxc define CONFIG_MII -
they have to:
#ifndef CONFIG_MII
#error "CONFIG_MII has to be defined!"
#endif
Does every board that has a gasket define CONFIG_RMII?
as far as I can see, there are some inconsistencies. All boards define
CONFIG_MII, but they really need CONFIG_RMII, because only with my last
patch I set the gasket for MII. The driver has always set in a fixed way
the gasket for RMII, independently if CONFIG_RMII or CONFIG_MII was set,
and that is also wrong.
Ah, so, to answer Troy, there really is RMII boards (which maybe was obvious to
all others than me; I reasoned in wrong direction: because they would be
already broken with this code, there could be none) and they were already broken.
I would say that the configuration file of most boards using fec_mxc
must be changed.
And then fec_mxc.c does not need at all these lines:
#ifndef CONFIG_MII
#error "CONFIG_MII has to be defined!"
#endif
Functionally this does nothing of course but I can imagine the reasoning behind
that check: If I understand correctly, fec_mxc depends on MII management
interface (for example miiphy_wait_aneg). Then, if CONFIG_MII is not defined,
there is inconsistency because configuration says "don't use MII" but fec_mxc
still uses it. I don't know whether this causes any confusion.
Boards are compiled clean without them. Correct me if I am wrong, but it
seems the correct way to do is to drop the unneeded check in the above
lines and sets CONFIG_RMII for all boards except the only one
(ima3-mx53), that needs really MII.
Agreed regarding CONFIG_RMII. With dropping the check I'm OK either way.
Furthermore, I might like to propose to change the name of the configuration
variable CONFIG_MII to CONFIG_MII_MGM or something like that. That might reduce
confusion (at least I have been quite confused).
--
Timo
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