[U-Boot] [PATCH 1/4 v2] serial: Add Zynq serial driver

[Marek Vasut <marex@denx.de>]

Dear Joe Hershberger,

> Hi Marek,
> 
> On Thu, Sep 13, 2012 at 11:47 PM, Marek Vasut <marex@denx.de> wrote:
> > Dear Joe Hershberger,
> > 
> >> Hi Marek,
> >> 
> >> On Thu, Sep 13, 2012 at 9:01 AM, Marek Vasut <marex@denx.de> wrote:
> >> > Dear Michal Simek,
> >> > 
> >> >> On 09/13/2012 02:33 PM, Marek Vasut wrote:
> >> >> > Dear Michal Simek,
> >> >> > 
> >> >> >> On 09/13/2012 11:21 AM, Marek Vasut wrote:
> >> >> >>> Dear Michal Simek,
> >> >> >>> 
> >> >> >>>> The driver is used on Xilinx Zynq platform.
> >> >> >>>> 
> >> >> >>>> Signed-off-by: Michal Simek <monstr@monstr.eu>
> >> >> >>>> 
> >> >> >>>> ---
> >> >> >>>> v2: Use Zynq name instead of Dragonfire and XPSS/XDFUART
> >> >> >>>> 
> >> >> >>>>       Rename driver name
> >> >> >>>>       Remove driver description
> >> >> >>>> 
> >> >> >>>> ---
> >> >> >>>> 
> >> >> >>>>    drivers/serial/Makefile      |    1 +
> >> >> >>>>    drivers/serial/serial_zynq.c |  200
> >> >> >>>> 
> >> >> >>>> ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 201
> >> >> >>>> insertions(+), 0 deletions(-)
> >> >> >>>> 
> >> >> >>>>    create mode 100644 drivers/serial/serial_zynq.c
> >> >> >>> 
> >> >> >>> [...]
> >> >> >>> 
> >> >> >>> It looks ok, but can you make it support CONFIG_SERIAL_MULTI
> >> >> >>> right away please?
> >> >> >> 
> >> >> >> Yes, it will add serial_multi in the next patch.
> >> >> >> Can you give me your ACK or reviewed-by line? :-)
> >> >> > 
> >> >> > Just squash them into one patch please.
> >> >> 
> >> >> Done.
> >> > 
> >> > Thanks ... my idea is to switch to serial_multi completely, then
> >> > rework stdio, unify serial on top of it and clean up the whole
> >> > subsystem. Thanks for helping!
> >> 
> >> I have a patch that I'll send soon that moves the "nulldev" driver to
> >> the serial driver (if CONFIG_SERIAL_MULTI is defined) so that it is
> >> possible to avoid serial init.
> > 
> > Thanks, this will break my massive patchset though. Can you check
> > git://git.denx.de/u-boot-marex.git / stdio branch ? I did something to
> > nulldev there. Probably ignore the top 7 patches, they're bogus and need
> > further work. It's all still work in progress to some point.
> 
> Too bad I can't just browse this at gitweb.

Intended ... just

git remote add marex git://...
git fetch marex
git checkout -t -b stdio marex/stdio

And enjoy the horror show :-)

> >> I had the problem that the serial port
> >> on my Zynq product lives in the fabric instead of using the hard-core
> >> ones.
> > 
> > I see ... why don't you implement nulldev_serial instead and leave
> > nulldev stdio as is?
> 
> Mostly because there is little point in supporting both at the same time.

Can you enlighten me ? stdio != serial, the purpose is different really.

If someone wants to setenv stdout serial and have serial null, be my guest. But 
then there really should be a direct, explicit stdio nulldev too.

> -Joe

Best regards,
Marek Vasut