From: Linus Walleij <linus.walleij@linaro.org>
To: Andrew Lunn <andrew@lunn.ch>
Cc: Ioana Ciornei <ioana.ciornei@nxp.com>,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-gpio@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>,
Bartosz Golaszewski <brgl@bgdev.pl>,
Shawn Guo <shawnguo@kernel.org>,
Michael Walle <mwalle@kernel.org>, Lee Jones <lee@kernel.org>,
Frank Li <Frank.Li@nxp.com>
Subject: Re: [PATCH 4/9] gpio: regmap: add the .get_direction() callback
Date: Fri, 11 Jul 2025 19:43:13 +0200 [thread overview]
Message-ID: <CACRpkdYDTXA7+YN2zRCsQxu2AKEAwbDVq8-m27ah5XTw9iRNPw@mail.gmail.com> (raw)
In-Reply-To: <0d0e9cee-2aaa-402d-a811-8c4704aadd74@lunn.ch>
On Wed, Jul 9, 2025 at 5:09 PM Andrew Lunn <andrew@lunn.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
next prev parent reply other threads:[~2025-07-11 17:43 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-09 11:26 [PATCH 0/9] drivers: gpio: and the QIXIS FPGA GPIO controller Ioana Ciornei
2025-07-09 11:26 ` [PATCH 1/9] dt-bindings: gpio: add bindings for the QIXIS FPGA based " Ioana Ciornei
2025-07-09 12:14 ` Krzysztof Kozlowski
2025-07-09 13:55 ` Ioana Ciornei
2025-07-09 14:11 ` Krzysztof Kozlowski
2025-07-10 22:01 ` Rob Herring
2025-07-15 12:19 ` Ioana Ciornei
2025-07-09 11:26 ` [PATCH 2/9] dt-bindings: fsl,fpga-qixis-i2c: extend support to also cover the LX2160ARDB FPGA Ioana Ciornei
2025-07-09 12:17 ` Krzysztof Kozlowski
2025-07-09 14:31 ` Ioana Ciornei
2025-07-10 22:04 ` Rob Herring
2025-07-09 11:26 ` [PATCH 3/9] mfd: simple-mfd-i2c: add compatible string for LX2160ARDB Ioana Ciornei
2025-07-09 11:26 ` [PATCH 4/9] gpio: regmap: add the .get_direction() callback Ioana Ciornei
2025-07-09 15:01 ` Michael Walle
2025-07-14 13:17 ` Ioana Ciornei
2025-07-09 15:09 ` Andrew Lunn
2025-07-09 15:36 ` Michael Walle
2025-07-10 9:23 ` Ioana Ciornei
2025-07-11 17:43 ` Linus Walleij [this message]
2025-07-11 17:45 ` Andrew Lunn
2025-07-11 18:06 ` Linus Walleij
2025-07-14 6:36 ` Michael Walle
2025-07-15 11:38 ` Ioana Ciornei
2025-07-15 12:51 ` Michael Walle
2025-07-09 11:26 ` [PATCH 5/9] drivers: gpio: add QIXIS FPGA GPIO controller Ioana Ciornei
2025-07-09 15:17 ` Andrew Lunn
2025-07-10 10:01 ` Ioana Ciornei
2025-07-10 14:12 ` Andrew Lunn
2025-07-09 11:26 ` [PATCH 6/9] arm64: dts: lx2160a-rdb: describe the QIXIS FPGA and two child GPIO controllers Ioana Ciornei
2025-07-09 11:26 ` [PATCH 7/9] arm64: dts: ls1046a-qds: describe the FPGA based GPIO controller Ioana Ciornei
2025-07-09 11:26 ` [PATCH 8/9] arm64: dts: lx2160a-rdb: fully describe the two SFP+ cages Ioana Ciornei
2025-07-09 11:26 ` [PATCH 9/9] arm64: dts: ls1046a-qds: describe the two on-board " Ioana Ciornei
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