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

[Hans de Goede <hdegoede@redhat.com>]

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).

> 
>> 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.

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

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

Regards,

Hans