[U-Boot] [BUG] booting on the Tinker Board (tinker-rk3288_defconfig) is broken

[Philipp Tomsich]

> On 12.02.2019, at 13:38, David Wu <david.wu at rock-chips.com> wrote:
> 
> Hi Philipp,
> 
> 在 2019/2/10 上午2:24, Philipp Tomsich 写道:
>> That said, I have been fighting issues from this patchset when trying to read
>> from devices on the i2c0 bus on a RK3399—which had me add a “simple”
>> pinctrl device again, as pulling all the dependencies into the SPL is a pain.
> 
> I think you can also add the simple ops if necessary. Full pinctrl
> should only be used at the U-boot stage, or the SPL stage where the TPL is available.

I started on this and will submit it with the follow-on changes that depend on this, as
I don’t want to pull in the ~10k of extra size.

There’s a number of failure modes in the SPL/TPL path from missing DTB nodes (as
one would need to add pre-reloc tags to all pinctrl and dependent nodes).

> For most boards about 3288, there is no need to enable pinctrl at SPL
> stage, such as Tinker board.
> 
> 
>> Unfortunately, in this merge I had to make a judgement call between insisting
>> on code-quality and getting the full pinctrl-driver merged.  With this release
>> cycle being longer and having 5 RCs, I figured we’ll have time to iron out any
>> wrinkles...
> 
>