[PATCH 7/7] ARM: EXYNOS: Remove code for restart and poweroff for exynos SoCs

[Alim Akhtar]

Hi krzysztof,

On Mon, Oct 19, 2015 at 6:58 PM, Krzysztof Kozlowski
<k.kozlowski at samsung.com> wrote:
> 2015-10-19 18:56 GMT+09:00 Javier Martinez Canillas <javier at osg.samsung.com>:
>> Hello,
>>
>> On 10/19/2015 09:00 AM, Krzysztof Kozlowski wrote:
>>> On 19.10.2015 15:03, Alim Akhtar wrote:
>>>> Now we can use the generic syscon-{reboot/poweroff} drivers,
>>>> so we don't need special handling for reboot/poweroff in
>>>> exynos pmu driver. This patch remove the same.
>>>>
>>>> Signed-off-by: Alim Akhtar <alim.akhtar at samsung.com>
>>>> ---
>>>>  arch/arm/mach-exynos/pmu.c |   43 -------------------------------------------
>>>>  1 file changed, 43 deletions(-)
>>>
>>> I think that removal of this stuff will effectively remove the
>>> restart/poweroff handlers from:
>>> 1. Other defconfigs, like multi_v7
>>> 2. Custom configs.
>>>
>>
>> This will also break old DTBs that don't have a "syscon-poweroff" device
>> node that contains the necessary PMU regmap, offset and mask information.
>
> I am not sure whether this is ABI break issue. There was no compatible
> mentioning that "reset works" which now would be replaced. The
> existing PMU compatible (like samsung,exynos4412-pmu) does not mention
> "reset" as a feature coming with this compatible.
>
> So no ABI break.
>
You are right, there is no DT ABI break here.

>
>>
>>> Previously this code was always compiled in for ARCH_EXYNOS. Now it is
>>> not so I am thinking about selecting necessary drivers from main exynos
>>> Kconfig symbol. That could be tricky though, because "select" should be
>>> used only for non-visible symbols.
>>>
>>> Any ideas how to solve that?
>>>
>>
>> Is true that select should only be used for non-visible symbols but there
>> are others user visible symbols that are selected by ARCH_EXYNOS such as
>> EXYNOS_THERMAL. So I think selecting the regmap syscon reset stuff there
>> is a sensible option.
>
> Selecting from defconfig is not sufficient... since I do not have
> other idea than selecting then ovak, but Alim please check it whether
> it does not create circular dependencies on various configs.
>
I checked in multi_v7_defconfig SYSCON_RESET is already enabled by
default. so I doubt we are going to run into any circular
dependencies, will check again..thanks.

> Best regards,
> Krzysztof
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-- 
Regards,
Alim