linux-kernel - Re: [PATCH v2] Documentation: gpio: add documentation about using software nodes

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Message-ID: <b69d92aa-2d41-4b79-ad15-75b73897e263@infradead.org>
Date: Sat, 16 Aug 2025 16:17:32 -0700
From: Randy Dunlap <rdunlap@...radead.org>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>,
 Linus Walleij <linus.walleij@...aro.org>, Bartosz Golaszewski
 <brgl@...ev.pl>, Jonathan Corbet <corbet@....net>
Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
 Arnd Bergmann <arnd@...nel.org>, Hans de Goede <hansg@...nel.org>,
 linux-gpio@...r.kernel.org, linux-doc@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] Documentation: gpio: add documentation about using
 software nodes



On 8/16/25 3:21 PM, Randy Dunlap wrote:
> 
> 
> On 8/16/25 3:08 PM, Randy Dunlap wrote:
>> Hi,
>>
>> On 8/15/25 10:30 AM, Dmitry Torokhov wrote:
>>> Introduce documentation regarding use of software nodes to describe
>>> GPIOs on legacy boards that have not been converted to device tree.
>>>
>>> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
>>> ---
>>>
>>> v2: Addressed Randy's comments.
>>>
>>>  Documentation/driver-api/gpio/board.rst       |  65 ++++
>>>  Documentation/driver-api/gpio/index.rst       |   1 +
>>>  .../driver-api/gpio/legacy-boards.rst         | 298 ++++++++++++++++++
>>>  3 files changed, 364 insertions(+)

Hi Dmitry,

There are a few build errors with the example code. It's OK to leave that
as an exercise for the reader. :)

There are a few missing header files, but the biggest build warning/error
is a Section mismatch:
WARNING: modpost: gpio-swnodes: section mismatch in reference: myboard_exit+0x1f (section: .exit.text) -> myboard_swnodes (section: .init.rodata)

so myboard_swnodes should not be marked as __initconst.

cheers.
-- 
~Randy