linux-kernel - Re: [PATCH] ARM: dts: Revert disabling of smc91x for n900

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Message-Id: <201502191747.24296@pali>
Date:	Thu, 19 Feb 2015 17:47:24 +0100
From:	Pali Rohár <pali.rohar@...il.com>
To:	Tony Lindgren <tony@...mide.com>
Cc:	linux-omap@...r.kernel.org, Kevin Hilman <khilman@...nel.org>,
	Aaro Koskinen <aaro.koskinen@....fi>,
	Sebastian Reichel <sre@...nel.org>,
	Pavel Machek <pavel@....cz>, linux-kernel@...r.kernel.org,
	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
	Nishanth Menon <nm@...com>
Subject: Re: [PATCH] ARM: dts: Revert disabling of smc91x for n900

On Wednesday 18 February 2015 23:42:06 Tony Lindgren wrote:
> * Pali Rohár <pali.rohar@...il.com> [150218 11:07]:
> > On Wednesday 18 February 2015 17:33:53 Tony Lindgren wrote:
> > > > */ +//		reg = <1 0x300 0xf>;		/* 16 byte IO range at
> > 
> > offset
> > 
> > > > 0x300 */ +		reg = <1 0x0 0xf>;		/* 16 byte IO range
> > 
> > at
> > 
> > > > offset 0x300 */
> > > > 
> > > >  		bank-width = <2>;
> > > >  		pinctrl-names = "default";
> > > >  		pinctrl-0 = <&ethernet_pins>;
> > > 
> > > Oh cool, the 0x300 offset is there mostly to suppress
> > > warnings about non-standard location.
> 
> ...
> 
> > > OK that's good news. Care to do a patch to set the offset
> > > 0x0 with added comment that qemu needs it? I'll test to
> > > make sure it works on the real hardware as well.
> > 
> > Yes, I can send proper git format-patch, but first let me
> > know if that change does not break your HW...
> 
> Yes using reg = <1 0 0xf> works, it just adds this extra
> warning:
> 
> smc91x 2000000.ethernet (unnamed net_device) (uninitialized):
> smc91x: IOADDR d09d6000 doesn't match configuration (300).
> 
> And I'm pretty sure that can be fixed by setting the EEPROM
> offset to 0 instead of the default 0x300. People with smc91x
> most likely want to write at least the MAC address to the
> EEPROM, so might as well set the offset to zero then too.
> 
> Of course it's always possible to do do a omap3-n900-qemu.dts
> if larger changes are needed :)
> 
> Regards,
> 
> Tony

Anyway, here are original Nokia board data (2.6.28) for smc91x ethernet:

https://gitorious.org/linux-n900/linux-n900/source/629fc5ab00cafb31272c478efa2c2b35fabd4c70:arch/arm/mach-omap2/board-rx51-peripherals.c#L42

https://gitorious.org/linux-n900/linux-n900/source/629fc5ab00cafb31272c478efa2c2b35fabd4c70:arch/arm/mach-omap2/board-rx51-peripherals.c#L274

Can you check if it match with our data in DT file?

-- 
Pali Rohár
pali.rohar@...il.com

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