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

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Message-Id: <DCZEHUCR7Z0M.V8VY2036N4IW@kernel.org>
Date: Mon, 22 Sep 2025 16:32:23 +0200
From: "Michael Walle" <mwalle@...nel.org>
To: "Ioana Ciornei" <ioana.ciornei@....com>, "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>,
 "Lee Jones" <lee@...nel.org>, <devicetree@...r.kernel.org>,
 <linux-gpio@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Cc: "Frank Li" <Frank.Li@....com>
Subject: Re: [PATCH v5 07/12] gpio: regmap: add the .fixed_direction_output
 configuration parameter

> 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>

Reviewed-by: Michael Walle <mwalle@...nel.org>

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