linux-kernel - Re: [PATCH v5 07/12] gpio: regmap: add the .fixed_direction

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Message-ID: <CAMRc=MenTm-HVzpi3H3uiMUDD58Y0GSXvo0Ng464PSQTdye2tQ@mail.gmail.com>
Date: Mon, 22 Sep 2025 07:39:27 -0700
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Ioana Ciornei <ioana.ciornei@....com>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, Linus Walleij <linus.walleij@...aro.org>, 
	Bartosz Golaszewski <brgl@...ev.pl>, Shawn Guo <shawnguo@...nel.org>, Michael Walle <mwalle@...nel.org>, 
	Lee Jones <lee@...nel.org>, devicetree@...r.kernel.org, linux-gpio@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Frank Li <Frank.Li@....com>
Subject: Re: [PATCH v5 07/12] gpio: regmap: add the .fixed_direction_output
 configuration parameter

On Mon, 22 Sep 2025 16:24:22 +0200, Ioana Ciornei <ioana.ciornei@....com> said:
> There are GPIO controllers such as the one present in the LX2160ARDB
> QIXIS FPGA which have fixed-direction input and output GPIO lines mixed
> together in a single register. This cannot be modeled using the
> gpio-regmap as-is since there is no way to present the true direction of
> a GPIO line.
>
> In order to make this use case possible, add a new configuration
> parameter - fixed_direction_output - into the gpio_regmap_config
> structure. This will enable user drivers to provide a bitmap that
> represents the fixed direction of the GPIO lines.
>
> Signed-off-by: Ioana Ciornei <ioana.ciornei@....com>
> ---
> Changes in v2:
> - Add the fixed_direction_output bitmap to the gpio_regmap_config
> Changes in v3:
> - Make a deep copy of the new bitmap.
> - Remove the offset check against the ngpio.
> - Added documentation for the new config field.
> Changes in v4:
> - Replace devres bitmap allocation with bitmap_alloc() and
>   bitmap_free().
> Changes in v5:
> - Rebased on top of latest linux-next, change the extra goto statement.
>

Acked-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>