linux-kernel - Re: [PATCH 4/9] gpio: regmap: add the .get

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Message-ID: <CACRpkdYDTXA7+YN2zRCsQxu2AKEAwbDVq8-m27ah5XTw9iRNPw@mail.gmail.com>
Date: Fri, 11 Jul 2025 19:43:13 +0200
From: Linus Walleij <linus.walleij@...aro.org>
To: Andrew Lunn <andrew@...n.ch>
Cc: Ioana Ciornei <ioana.ciornei@....com>, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Bartosz Golaszewski <brgl@...ev.pl>, Shawn Guo <shawnguo@...nel.org>, Michael Walle <mwalle@...nel.org>, 
	Lee Jones <lee@...nel.org>, Frank Li <Frank.Li@....com>
Subject: Re: [PATCH 4/9] gpio: regmap: add the .get_direction() callback

On Wed, Jul 9, 2025 at 5:09 PM Andrew Lunn <andrew@...n.ch> wrote:

> This is not my area, so i will deffer to the GPIO
> Maintainers. However, it is not clear to me what get_direction()
> should return.

This callback should return the current direction as set up
in the hardware.

A major usecase is that this is called when the gpiochip is
registered to read out all the current directions of the GPIO
lines, so the kernel has a clear idea of the state of the
hardware.

Calling this should ideally result in a read of the status from
a hardware register.

Yours,
Linus Walleij