[U-Boot] [PATCH v2 2/2] Tegra: MMC: Add DT support to MMC driver for all T20 boards

[Tom Warren]

Stephen,

On Tue, Feb 12, 2013 at 2:06 PM, Stephen Warren <swarren at wwwdotorg.org> wrote:
> On 02/12/2013 01:57 PM, Tom Warren wrote:
>> Stephen,
>>
>> On Tue, Feb 12, 2013 at 1:38 PM, Stephen Warren <swarren at wwwdotorg.org> wrote:
>>> On 02/11/2013 10:17 AM, Tom Warren wrote:
>>>> tegra_mmc_init() now parses the DT info for bus width, WP/CD GPIOs, etc.
>>>> Tested on Seaboard, fully functional.
>>>>
>>>> Tamonten boards (medcom-wide, plutux, and tec) use a different/new
>>>> dtsi file w/common settings.
>
>>>> diff --git a/include/configs/medcom-wide.h b/include/configs/medcom-wide.h
>>>> diff --git a/include/configs/plutux.h b/include/configs/plutux.h
>>>> diff --git a/include/configs/tec.h b/include/configs/tec.h
>>>
>>> In all 3 of those files ...
>>>
>>>>  #define CONFIG_DEFAULT_DEVICE_TREE   tegra20-medcom-wide
>>>
>>> Why not change that define ...
>>>
>>>>  #define CONFIG_OF_CONTROL
>>>>  #define CONFIG_OF_SEPARATE
>>>> +#undef CONFIG_ARCH_DEVICE_TREE
>>>> +#define CONFIG_ARCH_DEVICE_TREE              tegra20-tamonten
>>>
>>> rather than adding that one? All the other Tegra boards only set
>>> CONFIG_DEFAULT_DEVICE_TREE.
>>
>> CONFIG_DEFAULT_DEVICE_TREE is the .dts file (board/nvidia/dts).
>> CONFIG_ARCH_DEVICE_TREE is the .dtsi file (arch/arm/dts). See
>> Thierry's explanation, also.
>
> So why set CONFIG_ARCH_DEVICE_TREE to tegra20-tamonten here; if that
> variable is supposed to point at the SoC .dtsi file, that value is
> wrong; it *should* be tegra20.dtsi.
>
> Oh yuck. I see what's going on now. e.g. tegra20-medcom-wide.dts is
> including ARCH_CPU_DTS. It should be including tegra20-tamonten.dtsi,
> which then includes ARCH_CPU_DTS. The ARCH_CPU_DTS variable is supposed
> to only ever point at the SoC .dtsi file, not any "intermediate" .dtsi
> file... You probably need to put tegra20-tamonten.dtsi into
> board/avionic-design/dts rather than arch/arm/dts to make that work.

OK, I've removed the overrides for CONFIG_ARCH_DEVICE_TREE in the AD
config files, and added 'tegra20-tamonten.dtsi' to the include line in
the AD .dts files. I have to add an include path to the DTC command
line in dts/Makefile so it can find tegra20-tamonten.dtsi in
arch/$(ARCH)/dts, but it all builds fine. I'll have to rely on Thierry
for testing. This will all be in v3, going up today or tomorrow.

Thanks,

Tom