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Fri, 21 Mar 2025 08:49:47 -0700 (PDT) From: Bartosz Golaszewski Date: Fri, 21 Mar 2025 16:49:33 +0100 Subject: [PATCH 1/6] gpio: TODO: remove the item about the new debugfs interface Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250321-gpio-todo-updates-v1-1-7b38f07110ee@linaro.org> References: <20250321-gpio-todo-updates-v1-0-7b38f07110ee@linaro.org> In-Reply-To: <20250321-gpio-todo-updates-v1-0-7b38f07110ee@linaro.org> To: Linus Walleij , Bartosz Golaszewski Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, Bartosz Golaszewski X-Mailer: b4 0.14.1 X-Developer-Signature: v=1; a=openpgp-sha256; l=2470; i=bartosz.golaszewski@linaro.org; h=from:subject:message-id; bh=wdL+OKAjw1IH0HSGRarL/B7X1Jbr68CDvNMAAbARso0=; b=owEBbQKS/ZANAwAKARGnLqAUcddyAcsmYgBn3YqY+eO7xsW2SOOoNalGMEC3nIE5fQEeyXYNu C7+MtmOt6qJAjMEAAEKAB0WIQQWnetsC8PEYBPSx58Rpy6gFHHXcgUCZ92KmAAKCRARpy6gFHHX cjjDEACUdUh9u4G6a7nZ38JQTvoUong4yxXKo114w46Cr8MRAEYvrjDEOmces4FI9YkqPYFXVAu 34c+p0CBwTn/NB9Z3DQsn6AyT01ubB1O4m40tJrBl95xfWlLowgVoePp/FYgjBxgAlZZmkXNZPw IageYREwK/zCI3atdwUuW2l1G94D2WMS6aEAzsroWogQHSIuj/10m4C+aLJxgbl001q8Kgjgli6 6+S7h5QLL0g7/UPxOtlSdeG7aBkCSY96ZDphrafT5j2EXrM9SByxO7qR8ZFAgbEL96Yc5RMdGA+ LlkHHNs3XiMbu97B8ppR/pXpM9llaK2HJaHtYVTZ66ObQ4csCQJMcTG7R0v9DyiFyo5uP5+1PdP yy5pI2l0La2JixCrfI+4Iug1odM+oznr1IdjNa++l5MZTE3xjWqUEep9tJkfFCclL0eKZsN9fgz CGl8ckKcglney2WyEV25U2KtpkL9D6KQAGg45ts0PTiT17mOhnoK3WFYsgyaXMKflOZuZQV0U6D EUrIJjdznImvI6Pwl57Q3zRdtawmDLsKx1r7KV8a3xL40VqfNL4+l664G/vfAY8/LXM+h6KKqrk r/hKGjM5jYs0LorwAqMsESFAM35/PBfc1xxmsW7WCGe++9LHBj0ABgxbPs1wK7nVZF1Kq+y84Mt hVAHIwwfszHFcKg== X-Developer-Key: i=bartosz.golaszewski@linaro.org; a=openpgp; fpr=169DEB6C0BC3C46013D2C79F11A72EA01471D772 From: Bartosz Golaszewski The consensus among core GPIO stakeholders seems to be that a new debugfs interface will only increase maintenance burden and will fail to attract users that care about long-term stability of the ABI[1]. Let's not go this way and not add a fourth user-facing interface to the GPIO subsystem. [1] https://lore.kernel.org/all/9d3f1ca4-d865-45af-9032-c38cacc7fe93@pengut= ronix.de/ Signed-off-by: Bartosz Golaszewski Reviewed-by: Linus Walleij --- drivers/gpio/TODO | 36 ------------------------------------ 1 file changed, 36 deletions(-) diff --git a/drivers/gpio/TODO b/drivers/gpio/TODO index 942d1cd2bd3c9..9cf7b84cdb869 100644 --- a/drivers/gpio/TODO +++ b/drivers/gpio/TODO @@ -156,42 +156,6 @@ multiplexing, pin configuration, GPIO, etc selectable = options in one and the same pin control and GPIO subsystem. =20 =20 -Debugfs in place of sysfs - -The old sysfs code that enables simple uses of GPIOs from the -command line is still popular despite the existance of the proper -character device. The reason is that it is simple to use on -root filesystems where you only have a minimal set of tools such -as "cat", "echo" etc. - -The old sysfs still need to be strongly deprecated and removed -as it relies on the global GPIO numberspace that assume a strict -order of global GPIO numbers that do not change between boots -and is independent of probe order. - -To solve this and provide an ABI that people can use for hacks -and development, implement a debugfs interface to manipulate -GPIO lines that can do everything that sysfs can do today: one -directory per gpiochip and one file entry per line: - -/sys/kernel/debug/gpiochip/gpiochip0 -/sys/kernel/debug/gpiochip/gpiochip0/gpio0 -/sys/kernel/debug/gpiochip/gpiochip0/gpio1 -/sys/kernel/debug/gpiochip/gpiochip0/gpio2 -/sys/kernel/debug/gpiochip/gpiochip0/gpio3 -... -/sys/kernel/debug/gpiochip/gpiochip1 -/sys/kernel/debug/gpiochip/gpiochip1/gpio0 -/sys/kernel/debug/gpiochip/gpiochip1/gpio1 -... - -The exact files and design of the debugfs interface can be -discussed but the idea is to provide a low-level access point -for debugging and hacking and to expose all lines without the -need of any exporting. 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a=openpgp; fpr=169DEB6C0BC3C46013D2C79F11A72EA01471D772 From: Bartosz Golaszewski The removal of linux/gpio.h is already tracked by the item about converting drivers to using the descriptor-based API. Remove the duplicate. Signed-off-by: Bartosz Golaszewski Reviewed-by: Linus Walleij --- drivers/gpio/TODO | 9 --------- 1 file changed, 9 deletions(-) diff --git a/drivers/gpio/TODO b/drivers/gpio/TODO index 9cf7b84cdb869..ff955befd0ccf 100644 --- a/drivers/gpio/TODO +++ b/drivers/gpio/TODO @@ -86,15 +86,6 @@ Work items: CONFIG_OF_GPIO_MM_GPIOCHIP from the kernel. =20 =20 -Get rid of - -This legacy header is a one stop shop for anything GPIO is closely tied -to the global GPIO numberspace. The endgame of the above refactorings will -be the removal of and from that point only the specialized -headers under will be used. 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a=openpgp; fpr=169DEB6C0BC3C46013D2C79F11A72EA01471D772 From: Bartosz Golaszewski While there are surely some arguments in favor of integrating the GPIO and pinctrl subsystems into one, I believe this is not the right approach. The GPIO subsystem uses intricate locking with SRCU to handle the fact that both consumers and providers may run in different contexts. Pin-controller drivers are always meant to run in process context. This alone is a huge obstacle to any attempt at integration as evident by many problems we already encountered during the hotplug rework. The current glue code is pretty minimal and for most part already allows GPIO controllers to query pinctrl about the information they need. I suggest to drop this task and keep the subsystems separate even if many pin-controllers implement GPIO functionality in addition to pin functions. Signed-off-by: Bartosz Golaszewski Reviewed-by: Linus Walleij --- drivers/gpio/TODO | 11 ----------- 1 file changed, 11 deletions(-) diff --git a/drivers/gpio/TODO b/drivers/gpio/TODO index ff955befd0ccf..08ff60c65abbb 100644 --- a/drivers/gpio/TODO +++ b/drivers/gpio/TODO @@ -136,17 +136,6 @@ try to cover any generic kind of irqchip cascaded from= a GPIO. dry-code conversions to gpiolib irqchip for maintainers to test =20 =20 -Increase integration with pin control - -There are already ways to use pin control as back-end for GPIO and -it may make sense to bring these subsystems closer. One reason for -creating pin control as its own subsystem was that we could avoid any -use of the global GPIO numbers. 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a=openpgp; fpr=169DEB6C0BC3C46013D2C79F11A72EA01471D772 From: Bartosz Golaszewski For better readability of the TODO, let's add some graphical delimiters between tasks. Signed-off-by: Bartosz Golaszewski Reviewed-by: Linus Walleij --- drivers/gpio/TODO | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/gpio/TODO b/drivers/gpio/TODO index 08ff60c65abbb..052ba70070033 100644 --- a/drivers/gpio/TODO +++ b/drivers/gpio/TODO @@ -1,6 +1,7 @@ This is a place for planning the ongoing long-term work in the GPIO subsystem. =20 +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D =20 GPIO descriptors =20 @@ -48,6 +49,7 @@ Work items: numberspace accessors from and eventually delete altogether. =20 +--------------------------------------------------------------------------= ----- =20 Get rid of =20 @@ -75,6 +77,7 @@ Work items: - Delete when all the above is complete and everything uses or instead. =20 +--------------------------------------------------------------------------= ----- =20 Get rid of =20 @@ -85,6 +88,7 @@ Work items: to_of_mm_gpio_chip(), of_mm_gpiochip_add_data(), of_mm_gpiochip_remove(), CONFIG_OF_GPIO_MM_GPIOCHIP from the kernel. =20 +--------------------------------------------------------------------------= ----- =20 Collect drivers =20 @@ -99,6 +103,7 @@ At the same time it makes sense to get rid of code dupli= cation in existing or new coming drivers. For example, gpio-ml-ioh should be incorporated into gpio-pch. =20 +--------------------------------------------------------------------------= ----- =20 Generic MMIO GPIO =20 @@ -119,6 +124,7 @@ Work items: helpers (x86 inb()/outb()) and convert port-mapped I/O drivers to use this with dry-coding and sending to maintainers to test =20 +--------------------------------------------------------------------------= ----- =20 Generic regmap GPIO =20 @@ -126,6 +132,7 @@ In the very similar way to Generic MMIO GPIO convert th= e users which can take advantage of using regmap over direct IO accessors. 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a=openpgp; fpr=169DEB6C0BC3C46013D2C79F11A72EA01471D772 From: Bartosz Golaszewski Add an item tracking the treewide conversion of GPIO drivers to using the new line value setter callbacks in struct gpio_chip instead of the old ones that don't allow drivers to signal failures to callers. Signed-off-by: Bartosz Golaszewski Reviewed-by: Linus Walleij --- drivers/gpio/TODO | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/gpio/TODO b/drivers/gpio/TODO index 052ba70070033..3abf4805335f1 100644 --- a/drivers/gpio/TODO +++ b/drivers/gpio/TODO @@ -161,3 +161,15 @@ A small number of drivers have been converted (pl061, = tegra186, msm, amd, apple), and can be used as examples of how to proceed with this conversion. Note that drivers using the generic irqchip framework cannot be converted yet, but watch this space! + +--------------------------------------------------------------------------= ----- + +Convert all GPIO chips to using the new, value returning line setters + +struct gpio_chip's set() and set_multiple() callbacks are now deprecated. = They +return void and thus do not allow drivers to indicate failure to set the l= ine +value back to the caller. + +We've now added new variants - set_rv() and set_multiple_rv() that return = an +integer. Let's convert all GPIO drivers treewide to use the new callbacks, +remove the old ones and finally rename the new ones back to the old names. --=20 2.45.2 From nobody Wed Dec 17 10:10:14 2025 Received: from mail-wr1-f49.google.com (mail-wr1-f49.google.com [209.85.221.49]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 30FEB22B590 for ; Fri, 21 Mar 2025 15:49:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.49 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742572196; cv=none; b=GkrcIUdsp2KHg35L1IyeXfIhTsJyfqLiggwkAbK1M0iwHoc4tanQCptNKKrFfckExoBJd92MoxB8hgQ29+hycdq4VJnEBALHejLRPHebQNQMLmKcJ6h+wQ5b+KhoCRvzAiwGJtIuBQm9TdKb6zSEhdR6wT7MF21ZzdZLxGzDEjA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742572196; c=relaxed/simple; bh=7OKHQYItsHJqowDVAvvbjLqYjpAIU2xdGIEQwzoW4CU=; 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Fri, 21 Mar 2025 08:49:51 -0700 (PDT) Received: from [127.0.1.1] ([2a01:cb1d:dc:7e00:1aa4:f3ec:847a:32d1]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3997f9a3b4bsm2664406f8f.25.2025.03.21.08.49.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 21 Mar 2025 08:49:50 -0700 (PDT) From: Bartosz Golaszewski Date: Fri, 21 Mar 2025 16:49:38 +0100 Subject: [PATCH 6/6] gpio: TODO: add an item to track reworking the sysfs interface Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250321-gpio-todo-updates-v1-6-7b38f07110ee@linaro.org> References: <20250321-gpio-todo-updates-v1-0-7b38f07110ee@linaro.org> In-Reply-To: <20250321-gpio-todo-updates-v1-0-7b38f07110ee@linaro.org> To: Linus Walleij , Bartosz Golaszewski Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, Bartosz Golaszewski X-Mailer: b4 0.14.1 X-Developer-Signature: v=1; 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a=openpgp; fpr=169DEB6C0BC3C46013D2C79F11A72EA01471D772 From: Bartosz Golaszewski It seems there really exists the need for a simple sysfs interface that can be easily used from minimal initramfs images that don't contain much more than busybox. However the current interface poses a challenge to the removal of global GPIO numberspace. Add an item that tracks extending the existing ABI with a per-chip export/unexport attribute pair. Signed-off-by: Bartosz Golaszewski Reviewed-by: Linus Walleij --- drivers/gpio/TODO | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/drivers/gpio/TODO b/drivers/gpio/TODO index 3abf4805335f1..b5f0a7a2e1bf1 100644 --- a/drivers/gpio/TODO +++ b/drivers/gpio/TODO @@ -173,3 +173,16 @@ value back to the caller. We've now added new variants - set_rv() and set_multiple_rv() that return = an integer. Let's convert all GPIO drivers treewide to use the new callbacks, remove the old ones and finally rename the new ones back to the old names. + +--------------------------------------------------------------------------= ----- + +Extend the sysfs ABI to allow exporting lines by their HW offsets + +The need to support the sysfs GPIO class is one of the main obstacles to +removing the global GPIO numberspace from the kernel. In order to wean use= rs +off using global numbers from user-space, extend the existing interface wi= th +new per-gpiochip export/unexport attributes that allow to refer to GPIOs u= sing +their hardware offsets within the chip. + +Encourage users to switch to using them and eventually remove the existing +global export/unexport attribues. --=20 2.45.2