[U-Boot] [PATCH 1/5] sun6i: Make dram clk and zq value Kconfig options

[Ian Campbell]

On Tue, 2014-11-18 at 12:32 +0100, Hans de Goede wrote:
> Hi,
> 
> On 11/17/2014 07:54 PM, Ian Campbell wrote:
> > On Sun, 2014-11-16 at 17:16 +0100, Hans de Goede wrote:
> > 
> >> +config DRAM_ZQ
> >> +	int "sun6i dram zq value" if EXPERT
> >> +	default 123
> > 
> > == 0x7b, which differs from the previous default of 0x78 (not by much,
> > but still)
> 
> Right, this is deliberate as I've gotten access to more boards, 123 seems
> a better default (this is also what most A10 / A13 / A20 boards use).

Please mention this in the commit log.

> >> diff --git a/configs/Colombus_defconfig b/configs/Colombus_defconfig
> >> index bef568d..5e245a3 100644
> >> --- a/configs/Colombus_defconfig
> >> +++ b/configs/Colombus_defconfig
> >> @@ -4,3 +4,5 @@ CONFIG_FDTFILE="sun6i-a31-colombus.dtb"
> >>  +S:CONFIG_ARCH_SUNXI=y
> >>  +S:CONFIG_MACH_SUN6I=y
> >>  +S:CONFIG_TARGET_COLOMBUS=y
> >> ++S:CONFIG_DRAM_CLK=288
> >> ++S:CONFIG_DRAM_ZQ=379
> > 
> > Do these actually take affect if CONFIG_EXPERT=n?
> 
> Ugh, I just checked, and no they don't.
> 
> > Perhaps CONFIG_TARGET_COLOMBUS should select DRAM_CLK == 288 and
> > DRAM_CLK should be a hidden option?
> 
> I would prefer to keep these inside the defconfig's so that for
> adding a new board only a defconfig needs to be added.
>
> Currently the only CONFIG_TARGET_BOARD we actually use in u-boot is
> the bananapi gmac tx clk delay tweak, and I would actually like
> to keep things that way. Actually thinking more about this, I
> think that that should be turned into a GMAC specific Kconfig option
> and all the CONFIG_TARGET_BOARD stuff should be dropped, as it is
> just a drag causing extra maintenance going forward.

Hrm, I'm not sure yet which way I fall on this question.

> So is there a way to not show a choice to the user unless EXPERT
> mode is set, and still override it from Kconfig ?

Not AFAIK, but I'm not expert (no pun intended) in Kconfig.

> If that is not (easily) possible, then I guess we will just need
> to not make these "if EXPERT".

Probably :-(