[U-Boot] [PATCH] tegra: paz00: add device tree support

[Marc Dietrich]

Am Dienstag, 22. Mai 2012, 16:30:29 schrieb Stephen Warren:
> On 05/22/2012 03:15 PM, Marc Dietrich wrote:
> > On Tuesday 22 May 2012 10:58:37 Stephen Warren wrote:
> >> On 05/22/2012 10:14 AM, Stephen Warren wrote:
> >>> On 05/22/2012 02:04 AM, Marc Dietrich wrote:
> >>>> Hi Stephen,
> >>>> 
> >>>> Am Montag, 21. Mai 2012, 14:04:37 schrieb Stephen Warren:
> >>>>> From: Stephen Warren <swarren at nvidia.com>
> >>>>> 
> >>>>> ... to enable USB host support, which enables Ethernet support.
> >>>>> 
> >>>>> Signed-off-by: Stephen Warren <swarren at nvidia.com>
> >>>> 
> >>>> while adding usb support is fine, I see no reason to add smsc95xx
> >>>> support
> >>>> because contrary to harmony, paz00 does not contain an ethernet port.
> >>> 
> >>> Is the SMSC95xx only an internal part, or could it be present on a
> >>> user-pluggable USB dongle? I wasn't sure, so I left it in.
> >> 
> >> Looking at the driver (and the Linux kernel driver and SMSC's website),
> >> it supports both the standalone USB->Ethernet 9500 chip that's likely to
> >> be in USB Ethernet dongles, and various combo USB hub + Ethernet chips
> >> that are found on motherboards (e.g. Harmony). As such, I think it's
> >> reasonable to leave this config option enabled on Paz00 and other Tegra
> >> boards even when such a chip isn't on the board itself. Do you agree?
> > 
> > Following this argument would mean to enable all current (and future) usb
> > devices and we end up with an u-boot which is to heavy to swim. I only
> > have a mcs7830 which is unfortunately not supported. Do you have a
> > SMSC95xx based usb adapter or plan to get one? In this case I think it
> > would be ok to enable it, otherwise I tend to disagree here. On the other
> > hand, given that you kindly take care of the paz00 code, the decision is
> > up to you.
> 
> Mine is an Asix-based dongle.
> 
> It seems a pity to artificially limit ourselves. I'd be happy seeing all
> the USB devices enabled as the drivers are written myself.
> 
> But I suppose net-booting is a developer thing, and developers can
> easily turn on this option if they want, so I can remove it.
> 
> Is your objection for the Paz00 board only? I turned it on for all the
> other boards too. Note that Harmony really does have this chip on the
> board, so would need this option enabled either way.

My comment was only with regard to Paz00. Of course, if Harmony has it build 
in (I mean the hardware), it should also be included in u-boot. The question 
was more if we should also support all possible "pluggable" hw. I only found a 
smsc 9500 eval board (usb adapter) for 160 pounds, while my mcs only cost me 
1/10th of that. As I said, I'll leave it up to you (and the "vendors") to 
enable it in the build.

Marc