[U-Boot] [PATCH 6/9] fec_mxc: add support for MX51 processor

[Stefano Babic <sbabic@denx.de>]

Wolfgang Denk wrote:
> Dear Stefano Babic,

Hi Wolfgang,

> 
> I'm not sure. Here is where we enable the FEC because we want to use
> it in a network command, right? 

No, the fec_probe() function is called as part of the cpu_eth_init() and
sets the callbacks, among the other things. It is called always,
independently if we are ready to use a network command or not, it
depends only on CONFIG_FEC_MXC.

I do not find very correct that the MAC address is set in this function
(and not set anymore). What happens if I set the ethaddr variable ?
Changes will be not effective until next reset of the system. It is a
different issue, I know, but related to the same function. I had move
setting to fec_init(), but this is already implemented (and I can test
only on a i.MX51 board).

> Then this is the place to enable the
> needed clocks, too. These should not be globally enabled and running
> even if no network access is ever made - this would only increase the
> power dissipation, which is bad on battery operated devices.

However, I think it is the actual status in the driver, because the
fec_probe is always called. The clock initialization should be moved as
part of the fec_init() (that is, edev->init) to reach what you propose.

Best regards,
Stefano Babic

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