[U-Boot] [PATCH 1/2] spl: dm: Add SPL_DM_SEQ_ALIAS config option

[Marek Vasut <marex@denx.de>]

On Saturday, December 12, 2015 at 03:08:21 PM, Nathan Rossi wrote:
> On Sat, Dec 12, 2015 at 10:05 PM, Stefan Roese <sr@denx.de> wrote:
> > On 11.12.2015 18:32, Marek Vasut wrote:
> >> On Friday, December 11, 2015 at 04:46:40 PM, Michal Simek wrote:
> >>> On 11.12.2015 16:07, Marek Vasut wrote:
> >>>> On Friday, December 11, 2015 at 03:48:09 PM, Nathan Rossi wrote:
> >>>>> The Device Model sequence alias feature is required by some Uclasses.
> >>>>> Instead of disabling the feature for all SPL targets allow it to be
> >>>>> configured.
> >>>>> 
> >>>>> The config option is disabled by default to reduce code size for
> >>>>> targets
> >>>>> that are not interested or do not require this feature.
> >>>>> 
> >>>>> Signed-off-by: Nathan Rossi <nathan@nathanrossi.com>
> >>>>> Cc: Simon Glass <sjg@chromium.org>
> >>>>> Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
> >>>>> Cc: Linus Walleij <linus.walleij@linaro.org>
> >>>>> Cc: Marek Vasut <marex@denx.de>
> >>>>> Cc: Michal Simek <michal.simek@xilinx.com>
> >>>>> ---
> >>>>> Based on a small amount of inspection for the Zynq platform, enabling
> >>>>> this config option adds ~1KB of code size.
> >>>>> 
> >>>>> Also on a side note, this might affect the socfpga target as it
> >>>>> forcibly
> >>>>> overrides the #undef from config_uncmd_spl.h in its common header. I
> >>>>> have Cc'd the respective maintainer for this reason.
> >>>> 
> >>>> The fix for SoCFPGA is easy -- enable the SPL_DM_SEQ_ALIAS in
> >>>> configs/socfpga*. It is needed for booting from QSPI NOR.
> 
> I will add a patch to this series, depending on how it is agreed to
> enable this option.
> 
> >>> That's probably not the best solution. But of course we can use it.
> >>> IRC Stefan had the same problem.
> 
> So would a better solution be to force the ARCH_ZYNQ config (and
> others ARCH_SOCFPGA/ARCH_MVEBU) to 'select SPL_DM_SEQ_ALIAS' instead
> of enabling them separately for each defconfig? like is done for
> SPL_OF_CONTROL/etc.

That might make sense, yes.

But, I wonder if we can do without DM_SEQ_ALIAS altogether for the SPI NOR boot?

> >> So what is the solution ?
> > 
> > I added
> > 
> > #define CONFIG_DM_SEQ_ALIAS            1
> > 
> > to the common config header for MVEBU. If its possible to set this
> > via Kconfig in a way where its not #undef'ed by config_uncmd_spl.h,
> > that would be even better.
> 
> As with socfpga, would you like me to do the same for MVEBU, add a
> patch to this series to enable it for MVEBU?
> 
> Regards,
> Nathan

Best regards,
Marek Vasut