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From: Florian Fainelli <f.fainelli@gmail.com>
To: Linus Walleij <linus.walleij@linaro.org>,
	Stefan Wahren <stefan.wahren@i2se.com>
Cc: Bartosz Golaszewski <brgl@bgdev.pl>,
	Nicolas Saenz Julienne <nsaenz@kernel.org>,
	Ray Jui <rjui@broadcom.com>,
	Scott Branden <sbranden@broadcom.com>,
	bcm-kernel-feedback-list@broadcom.com,
	Arnd Bergmann <arnd@arndb.de>, Phil Elwell <phil@raspberrypi.com>,
	linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org
Subject: Re: [PATCH RFC 0/2] gpiolib: of: Introduce hook for missing gpio-ranges
Date: Wed, 16 Mar 2022 19:02:59 -0700	[thread overview]
Message-ID: <15171d7e-f065-88b8-b3b3-dbeed75c5e6e@gmail.com> (raw)
In-Reply-To: <CACRpkdYuxsYw99CZZK_GXp3V-mPiuL50CxgsE-=oRMApZf_bxA@mail.gmail.com>



On 3/16/2022 6:15 PM, Linus Walleij wrote:
> On Wed, Mar 9, 2022 at 8:44 PM Stefan Wahren <stefan.wahren@i2se.com> wrote:
> 
>> This patch series tries to provide backward compatibility for DTB which
>> lacks the gpio-ranges property.
>>
>> The commit ("pinctrl: msm: fix gpio-hog related boot issues") by Christian
>> Lamparter already contains a fallback in case the gpio-ranges property
>> is missing. But this approach doesn't work on BCM2835 with a gpio-hog
>> defined for the SoC GPIOs.
>>
>> Based Christian's on explanation i conclude that the fallback must happen
>> during the gpiochip_add() call and not afterwards. So the approach is to
>> call an optional hook, which can be implemented in the platform driver.
>>
>> This series has been tested on Raspberry Pi 3 B Plus.
>>
>> Stefan Wahren (2):
>>    gpiolib: of: Introduce hook for missing gpio-ranges
>>    pinctrl: bcm2835: implement hook for missing gpio-ranges
> 
> Looks good to me, is this something I should apply to the pinctrl
> tree or should I wait for a non-RFC version?

I would be inclined to slap a couple of different Fixes tag to each 
commit because breaking older DTBs should IMHO be considered a 
regression. So for the first patch I would add:

Fixes: 2ab73c6d8323 ("gpio: Support GPIO controllers without pin-ranges")

and for the second patch:

Fixes: 266423e60ea1 ("pinctrl: bcm2835: Change init order for gpio hogs")

WDYT?
-- 
Florian

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  reply	other threads:[~2022-03-17  2:04 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-09 19:43 Stefan Wahren
2022-03-09 19:43 ` [PATCH RFC 1/2] " Stefan Wahren
2022-03-15 15:17   ` Bartosz Golaszewski
2022-03-09 19:43 ` [PATCH RFC 2/2] pinctrl: bcm2835: implement " Stefan Wahren
2022-03-10  3:24 ` [PATCH RFC 0/2] gpiolib: of: Introduce " Florian Fainelli
2022-03-17  1:15 ` Linus Walleij
2022-03-17  2:02   ` Florian Fainelli [this message]
2022-03-17 11:48     ` Stefan Wahren
2022-03-17 17:17       ` Florian Fainelli
2022-03-17 19:23         ` Stefan Wahren
2022-03-21 18:21           ` Florian Fainelli
2022-03-24 19:00             ` Linus Walleij
2022-03-24 19:23               ` Florian Fainelli

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