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Mon, 31 Mar 2025 02:00:17 -0700 (PDT) From: Bartosz Golaszewski Date: Mon, 31 Mar 2025 11:00:09 +0200 Subject: [PATCH 1/3] gpio: deprecate the GPIOD_FLAGS_BIT_NONEXCLUSIVE flag 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: <20250331-gpio-todo-remove-nonexclusive-v1-1-25f72675f304@linaro.org> References: <20250331-gpio-todo-remove-nonexclusive-v1-0-25f72675f304@linaro.org> In-Reply-To: <20250331-gpio-todo-remove-nonexclusive-v1-0-25f72675f304@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=878; i=bartosz.golaszewski@linaro.org; h=from:subject:message-id; bh=tlGOX5FQjGMEQfrMpb3Lx+55MZB/eBiCAP/mbvbglPQ=; b=owEBbQKS/ZANAwAKARGnLqAUcddyAcsmYgBn6lmfvXKAtsbn/u07MB4pHBI6KOEjCjOjAIh23 zndHx/YlnqJAjMEAAEKAB0WIQQWnetsC8PEYBPSx58Rpy6gFHHXcgUCZ+pZnwAKCRARpy6gFHHX ciIxD/48yDvJXOQkZV1Wkm3Z75EezAAxi7pURHuz45RZYw5Q7lCWxtbJXtzQifZQU4OU6Sg6Uw/ y4pUCtPw/gX3iOqGyYstANfN9D2WkuXfrLWnfhhXchlJMhqT69iXltn94s2bBVLaVvN+H8VHj1Q sNenYfEI3zc1sGvTF7vx3XD/IFuZDT9s/b2nwVZmB6zrCytd5qYa9fZmKOjt/RMCahn1ItO6L5M mCtiZAD2tPtJzAlAsQV+vJv9J7ScCRV8m+Ca+5B2S9VN98mwbsVBDEzodjn4BIYLa0PrHPHdJZB uh16/AgMn2u4DqnB8K6zQGVH1xP0JqwFvixhLleslQoBdIKt3yTMbPsWD+PjZTJfVZGl5puJsD/ dxtGYA/V9KhL0WgL0WJyuqSRGttg1Bvy+JaNBKvxo/w2sMEiwI6T5NJyNw7sqpiSphVLZW7WQOB Hup7ItjsB9OWs80rA6496sseOwwOcOWdgmki7JXAzNlyl1KdXYcNdtkyy3Wu55kh8/Xgb4Tk6i/ 1M2Fs8LlQFfj2j/wkjug6/3yfh4RAXzKkJwQaSMSgbYEqaepAH5LzXQ3DDhBmHdPQCpRTQhBDhz mac2Dm4TOCcytK8KhKZ2LF7blX2EUM7948cE08+mDw+DDu5Zio0S8ApZq0/rKq/3nRBhXs94U6Q tJld+Arw4DIymAQ== X-Developer-Key: i=bartosz.golaszewski@linaro.org; a=openpgp; fpr=169DEB6C0BC3C46013D2C79F11A72EA01471D772 From: Bartosz Golaszewski The non-exclusive GPIO request flag looks like a functional feature but is in fact a bad workaround for a corner-case that got out of hand. It should be removed so deprecate it officially so that nobody uses it anymore. Signed-off-by: Bartosz Golaszewski Acked-by: Linus Walleij --- include/linux/gpio/consumer.h | 1 + 1 file changed, 1 insertion(+) diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h index 45b651c05b9c8..8adc8e9cb4a7b 100644 --- a/include/linux/gpio/consumer.h +++ b/include/linux/gpio/consumer.h @@ -31,6 +31,7 @@ struct gpio_descs { #define GPIOD_FLAGS_BIT_DIR_OUT BIT(1) #define GPIOD_FLAGS_BIT_DIR_VAL BIT(2) #define GPIOD_FLAGS_BIT_OPEN_DRAIN BIT(3) +/* GPIOD_FLAGS_BIT_NONEXCLUSIVE is DEPRECATED, don't use in new code. */ #define GPIOD_FLAGS_BIT_NONEXCLUSIVE BIT(4) =20 /** --=20 2.45.2 From nobody Fri Dec 19 19:54:41 2025 Received: from mail-wm1-f42.google.com (mail-wm1-f42.google.com [209.85.128.42]) (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 D47AB1D63F2 for ; Mon, 31 Mar 2025 09:00:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.42 ARC-Seal: i=1; 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a=openpgp; fpr=169DEB6C0BC3C46013D2C79F11A72EA01471D772 From: Bartosz Golaszewski Add GPIOD_FLAGS_BIT_NONEXCLUSIVE as a keyword to the GPIO entry so that we get notified if anybody tries to use it as it's a deprecated symbol. Signed-off-by: Bartosz Golaszewski Acked-by: Linus Walleij --- MAINTAINERS | 1 + 1 file changed, 1 insertion(+) diff --git a/MAINTAINERS b/MAINTAINERS index ce2b64f4568d5..210fbca61ad37 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -10151,6 +10151,7 @@ F: include/linux/gpio.h F: include/linux/gpio/ F: include/linux/of_gpio.h K: (devm_)?gpio_(request|free|direction|get|set) +K: GPIOD_FLAGS_BIT_NONEXCLUSIVE =20 GPIO UAPI M: Bartosz Golaszewski --=20 2.45.2 From nobody Fri Dec 19 19:54:41 2025 Received: from mail-wm1-f41.google.com (mail-wm1-f41.google.com [209.85.128.41]) (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 509091DD0EF for ; Mon, 31 Mar 2025 09:00:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.41 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743411625; cv=none; b=SUD7c5mpEONJ7BsBc+1rM9cjvSKG1eJloShUVtGEE9TuYN25LrykcIChXFhbR8Bo9MrqRl5MfKKCk0BKsJHNcif+pST2j9JQjitjhNX/O2bPusLCYbs59tb/kt1Q1WOANsSAoZn0/Gh5f26k99mue13r9iMKFhGzJfgWMlujkdQ= ARC-Message-Signature: i=1; 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a=openpgp; fpr=169DEB6C0BC3C46013D2C79F11A72EA01471D772 From: Bartosz Golaszewski This flag should be replaced by a better mechanism that counts the users and properly manages the resources. The pwrseq subsystem is a good candidate. GPIOs themselves should remain a unique resource. Add a task for tracking the removal of GPIOD_FLAGS_BIT_NONEXCLUSIVE. Signed-off-by: Bartosz Golaszewski Acked-by: Linus Walleij --- drivers/gpio/TODO | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/drivers/gpio/TODO b/drivers/gpio/TODO index b5f0a7a2e1bf1..5385071901993 100644 --- a/drivers/gpio/TODO +++ b/drivers/gpio/TODO @@ -186,3 +186,17 @@ their hardware offsets within the chip. =20 Encourage users to switch to using them and eventually remove the existing global export/unexport attribues. + +--------------------------------------------------------------------------= ----- + +Remove GPIOD_FLAGS_BIT_NONEXCLUSIVE + +This flag is an awful workaround that was created for some regulator +corner-cases but got out of hand and is now used in at least 33 places +treewide. Unlike what the intuition may tell users, it's not a reference +counted mechanisms like what clocks or regulators use but just a raw access +to the same GPIO descriptor from multiple places with no synchronization (= other +than what the underying driver offers). It doesn't even correctly support +releasing the supposedly non-exclusive GPIOs. This whole thing should go a= nd be +replaced with a better solution - for exampe: using the relatively new pow= er +sequencing subsystem. --=20 2.45.2