netdev - Re: [PATCH v4 05/10] net/fec: add dual fec support for mx28

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Date:	Tue, 11 Jan 2011 19:38:20 +0800
From:	Shawn Guo <shawn.guo@...escale.com>
To:	Sascha Hauer <s.hauer@...gutronix.de>
CC:	<davem@...emloft.net>, <gerg@...pgear.com>, <baruch@...s.co.il>,
	<eric@...rea.com>, <bryan.wu@...onical.com>,
	<r64343@...escale.com>, <B32542@...escale.com>,
	<u.kleine-koenig@...gutronix.de>, <lw@...o-electronics.de>,
	<w.sang@...gutronix.de>, <jamie@...ieiles.com>,
	<jamie@...reable.org>, <netdev@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v4 05/10] net/fec: add dual fec support for mx28

On Tue, Jan 11, 2011 at 11:27:17AM +0100, Sascha Hauer wrote:
> On Thu, Jan 06, 2011 at 03:13:13PM +0800, Shawn Guo wrote:
> > This patch is to add mx28 dual fec support. Here are some key notes
> > for mx28 fec controller.
> > 
> >  - The mx28 fec controller naming ENET-MAC is a different IP from FEC
> >    used on other i.mx variants.  But they are basically compatible
> >    on software interface, so it's possible to share the same driver.
> >  - ENET-MAC design on mx28 made an improper assumption that it runs
> >    on a big-endian system. As the result, driver has to swap every
> >    frame going to and coming from the controller.
> >  - The external phys can only be configured by fec0, which means fec1
> >    can not work independently and both phys need to be configured by
> >    mii_bus attached on fec0.
> >  - ENET-MAC reset will get mac address registers reset too.
> >  - ENET-MAC MII/RMII mode and 10M/100M speed are configured
> >    differently FEC.
> >  - ETHER_EN bit must be set to get ENET-MAC interrupt work.
> > 
> > Signed-off-by: Shawn Guo <shawn.guo@...escale.com>
> > ---
> > Changes for v4:
> >  - Use #ifndef CONFIG_ARM to include ColdFire header files
> >  - Define quirk bits in id_entry.driver_data to handle controller
> >    difference, which is more scalable than using device name
> >  - Define fec0_mii_bus as a static function in fec_enet_mii_init
> >    to fold the mii_bus instance attached on fec0
> >  - Use cpu_to_be32 over __swab32 in function swap_buffer
> > 
> > Changes for v3:
> >  - Move v2 changes into patch #3
> >  - Use device name to check if it's running on ENET-MAC
> > 
> >  drivers/net/Kconfig |    7 ++-
> >  drivers/net/fec.c   |  148 +++++++++++++++++++++++++++++++++++++++++++++------
> >  drivers/net/fec.h   |    5 +-
> >  3 files changed, 139 insertions(+), 21 deletions(-)
> > 
> > diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
> > index 4f1755b..f34629b 100644
> > --- a/drivers/net/Kconfig
> > +++ b/drivers/net/Kconfig
> > @@ -1944,18 +1944,19 @@ config 68360_ENET
> >  config FEC
> >  	bool "FEC ethernet controller (of ColdFire and some i.MX CPUs)"
> >  	depends on M523x || M527x || M5272 || M528x || M520x || M532x || \
> > -		MACH_MX27 || ARCH_MX35 || ARCH_MX25 || ARCH_MX5
> > +		MACH_MX27 || ARCH_MX35 || ARCH_MX25 || ARCH_MX5 || SOC_IMX28
> >  	select PHYLIB
> >  	help
> >  	  Say Y here if you want to use the built-in 10/100 Fast ethernet
> >  	  controller on some Motorola ColdFire and Freescale i.MX processors.
> >  
> >  config FEC2
> > -	bool "Second FEC ethernet controller (on some ColdFire CPUs)"
> > +	bool "Second FEC ethernet controller"
> >  	depends on FEC
> >  	help
> >  	  Say Y here if you want to use the second built-in 10/100 Fast
> > -	  ethernet controller on some Motorola ColdFire processors.
> > +	  ethernet controller on some Motorola ColdFire and Freescale
> > +	  i.MX processors.
> 
> This option is used nowhere and should be removed. Certainly it does not
> have the effect of enabling the second ethernet controller.
> 
As David has merged it, I would send a follow-up patch to remove it.

-- 
Regards,
Shawn

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