linux-kernel - Re: [PATCH v2 1/2] gpiolib: Fix a mess with the GPIO

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Date: Tue, 9 Apr 2024 11:42:37 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>, Kent Gibson <warthog618@...il.com>, 
	Linus Walleij <linus.walleij@...aro.org>, linux-gpio@...r.kernel.org, 
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-wireless@...r.kernel.org, brcm80211@...ts.linux.dev, 
	brcm80211-dev-list.pdl@...adcom.com, 
	Mika Westerberg <mika.westerberg@...ux.intel.com>, 
	Arend van Spriel <arend.vanspriel@...adcom.com>, Kalle Valo <kvalo@...nel.org>, 
	Charles Keepax <ckeepax@...nsource.cirrus.com>
Subject: Re: [PATCH v2 1/2] gpiolib: Fix a mess with the GPIO_* flags

On Tue, Apr 9, 2024 at 1:17 AM Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:
>
> The GPIO_* flag definitions are *almost* duplicated in two files
> (with unmatches OPEN_SOURCE / OPEN_DRAIN). Moreover, some code relies
> on one set of definitions while the rest is on the other. Clean up
> this mess by providing only one source of the definitions to all.
>
> Fixes: b424808115cb ("brcm80211: brcmsmac: Move LEDs to GPIO descriptors")
> Fixes: 5923ea6c2ce6 ("gpio: pass lookup and descriptor flags to request_own")
> Fixes: fed7026adc7c ("gpiolib: Make use of enum gpio_lookup_flags consistent")
> Fixes: 4c0facddb7d8 ("gpio: core: Decouple open drain/source flag with active low/high")
> Fixes: 69d301fdd196 ("gpio: add DT bindings for existing consumer flags")
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  drivers/gpio/gpiolib-of.c                     |  5 ++---
>  drivers/gpio/gpiolib.c                        |  8 +++-----
>  .../broadcom/brcm80211/brcmsmac/led.c         |  2 +-
>  include/linux/gpio/driver.h                   |  3 +--
>  include/linux/gpio/machine.h                  | 20 +++++--------------
>  5 files changed, 12 insertions(+), 26 deletions(-)
>

I don't think ./dt-bindings/gpio/gpio.h is the right source of these
defines for everyone - including non-OF systems. I would prefer the
ones in include/linux/gpio/machine.h be the upstream source but then
headers in include/dt-bindings/ cannot include them so my second-best
suggestion is to rename the ones in include/linux/gpio/machine.h and
treewide too. In general values from ./dt-bindings/gpio/gpio.h should
only be used in DTS sources and gpiolib-of code.

Bart