linux-kernel - Re: [PATCH v2] mfd: syscon: Add syscon_regmap_lookup_by_phandle

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Message-ID: <d4424323-25a9-9f70-b2c8-ce464180f788@gmail.com>
Date:   Tue, 17 Nov 2020 16:17:51 +0100
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        linux-kernel@...r.kernel.org,
        Collabora Kernel ML <kernel@...labora.com>,
        Nicolas Boichat <drinkcat@...omium.org>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v2] mfd: syscon: Add
 syscon_regmap_lookup_by_phandle_optional() function.



On 17/11/2020 13:37, Lee Jones wrote:
> On Tue, 17 Nov 2020, Matthias Brugger wrote:
> 
>> Hi Lee,
>>
>> On 13/11/2020 11:19, Lee Jones wrote:
>>> On Tue, 10 Nov 2020, Enric Balletbo i Serra wrote:
>>>
>>>> This adds syscon_regmap_lookup_by_phandle_optional() function to get an
>>>> optional regmap.
>>>>
>>>> It behaves the same as syscon_regmap_lookup_by_phandle() except where
>>>> there is no regmap phandle. In this case, instead of returning -ENODEV,
>>>> the function returns NULL. This makes error checking simpler when the
>>>> regmap phandle is optional.
>>>>
>>>> Suggested-by: Nicolas Boichat <drinkcat@...omium.org>
>>>> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
>>>> Reviewed-by: Matthias Brugger <matthias.bgg@...il.com>
>>>> ---
>>>>
>>>> Changes in v2:
>>>> - Add Matthias r-b tag.
>>>> - Add the explanation from the patch description to the code.
>>>> - Return NULL instead of -ENOTSUPP when regmap helpers are not enabled.
>>>>
>>>>    drivers/mfd/syscon.c       | 18 ++++++++++++++++++
>>>>    include/linux/mfd/syscon.h | 11 +++++++++++
>>>>    2 files changed, 29 insertions(+)
>>>
>>> Applied, thanks.
>>>
>>
>> I've a series [1] that's based on this patch, could you provide a stable
>> branch for it, so that I can take the series.
> 
> Why can't you base it off of for-mfd-next?
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd.git/log/?h=for-mfd-next
> 

I can do that, if you are willing to not overwrite the commit history. In my 
case it can happen that I drop a patch from my for-next branch as I realize that 
it e.g. breaks something. I think that's the reason why normally a stable branch 
get's created, as the commit ID won't change although you change the commit 
history of your for-mfd-next branch.

If you want to go the route for me rebasing my tree on top of for-mfd-next then 
I'd like to have at least a stable tag, so that it will be easier to provide the 
pull-request later on. Would that be a compromise?

Regards,
Matthias