linux-kernel - Re: [PATCH v2 3/5] gpio: Change ISA_BUS

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Date:   Fri, 23 Feb 2018 14:50:41 +0100
From:   "Maciej S. Szmigiero" <mail@...iej.szmigiero.name>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     William Breathitt Gray <vilhelm.gray@...il.com>,
        Guenter Roeck <linux@...ck-us.net>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        linux-iio@...r.kernel.org,
        LINUXWATCHDOG <linux-watchdog@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/5] gpio: Change ISA_BUS_API dependency to selection

On 22.02.2018 21:44, Maciej S. Szmigiero wrote:
> Hi William,
> Hi Linus,
> 
> On 22.02.2018 21:30, William Breathitt Gray wrote:
>> On Thu, Feb 22, 2018 at 04:16:17PM +0100, Linus Walleij wrote:
>>> On Fri, Dec 29, 2017 at 9:13 PM, William Breathitt Gray
>>> <vilhelm.gray@...il.com> wrote:
>>>
>>>> The ISA_BUS_API Kconfig option enables the compilation of the ISA bus
>>>> driver. The ISA bus driver does not perform any hardware interaction,
>>>> and is instead just a thin layer of software abstraction to eliminate
>>>> boilerplate code common to ISA-style device drivers. Since ISA_BUS_API
>>>> has no dependencies and does not jeopardize the integrity of the system
>>>> when enabled, drivers should select it when the ISA bus driver
>>>> functionality is needed.
>>>>
>>>> Cc: Linus Walleij <linus.walleij@...aro.org>
>>>> Signed-off-by: William Breathitt Gray <vilhelm.gray@...il.com>
>>>
>>> Patch applied to the GPIO tree for v4.17.
>>>
>>> Can you confirm that we don't have any dangling ISA
>>> drivers not using this?
>>>
>>> Yours,
>>> Linus Walleij
>>
>> Hi Linus,
>>
>> This patchset should cover all current mainline drivers depending on
>> ISA_BUS_API.
>>
> 
> Thanks for merging this series!
> 
> Note that gpio-winbond (CONFIG_GPIO_WINBOND) driver was originally
> merged using ISA_BUS_API selection as done for other ISA bus gpio drivers
> by this patch, then temporary switched to the previous ("depends on")
> style by commit 92a8046c9d952a to fix a circular Kconfig dependency.
> So now this commit (92...) should be reverted to make gpio-winbond
> driver Kconfig dependency / selection consistent with the remaining ISA
> bus gpio drivers.
> 
> Unfortunately, I can't test the reversion myself because it looks like
> Linus didn't push his trees yet to git.kernel.org after applying this
> series (or I am not looking at the right place - linusw/linux-gpio.git?).

It looks like the series has been pushed to git.kernel.org now.
I have tested the reversion of commit 92a8046c9d952a and can confirm
that the ISA_BUS_API dependency / selection for gpio-winbond works
then as intended (in a way that is consistent with other ISA bus gpio
drivers).

@Linus:
Will you revert that commit or should I submit a patch that does it?

Maciej