[U-Boot] [PATCH] ARM: reset: use do_reset in SPL/TPL if SYSRESET was not enabled for them

[Claudius Heine]

Hi,

On 10/01/2020 22.48, Tom Rini wrote:
> On Thu, Nov 28, 2019 at 09:56:47AM +0100, Claudius Heine wrote:
> 
>> In case CONFIG_SYSRESET is set, do_reset from reset.c will not be available
>> anywere, even if SYSRESET is disabled for SPL/TPL.
>>
>> 'do_reset' is called from SPL for instance from the panic handler and
>> PANIC_HANG is not set
>>
>> Signed-off-by: Claudius Heine <ch at denx.de>
>> Reviewed-by: Marek Vasut <marex at denx.de>
>> Reviewed-by: Simon Goldschmidt <simon.k.r.goldschmidt at gmail.com>
>> ---
>>  arch/arm/lib/Makefile | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/arch/arm/lib/Makefile b/arch/arm/lib/Makefile
>> index 9de9a9acee..7bf2c077ba 100644
>> --- a/arch/arm/lib/Makefile
>> +++ b/arch/arm/lib/Makefile
>> @@ -56,7 +56,7 @@ obj-y	+= interrupts_64.o
>>  else
>>  obj-y	+= interrupts.o
>>  endif
>> -ifndef CONFIG_SYSRESET
>> +ifndef CONFIG_$(SPL_TPL_)SYSRESET
>>  obj-y	+= reset.o
>>  endif
> 
> This needs to be updated and something reworked as it breaks imx8mp_evk
> imx8mn_ddr4_evk imx8mm_evk platforms that have since been added:
> board/freescale/imx8mm_evk/built-in.o: In function `do_reset':
> build/../board/freescale/imx8mm_evk/spl.c:164: multiple definition of `do_reset'
> and similar failures.
> 

It seems the imx8mm_evk and imx8mn_evk are the first platforms that
implement a 'do_reset' within its board files.

That means we then no longer have just two binary options where the
'do_reset' implementation originates from. Before that platform we only
had the ARM cpu reset and the sysreset driver.

That means if 'CONFIG_$(SPL_TPL_)SYSRESET == n' we cannot automatically
use the ARM platform reset.

We will probably need additional kconfig options to express this situation.

The question is, should we do that, or rather investigate why those
platforms need their own implementation?

Is it not possible to use the sysreset or arm reset driver there?

regards,
Claudius