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From: Bartosz Golaszewski <brgl@bgdev.pl>
Date: Tue, 01 Apr 2025 14:46:42 +0200
Subject: [PATCH v2 1/4] gpio: deprecate the GPIOD_FLAGS_BIT_NONEXCLUSIVE
flag
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From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
The non-exclusive GPIO request flag looks like a functional feature but
is in fact a workaround for a corner-case that got out of hand. It should
be removed so deprecate it officially so that nobody uses it anymore.
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
---
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 45b651c05b9c..8adc8e9cb4a7 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
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From: Bartosz Golaszewski <brgl@bgdev.pl>
Date: Tue, 01 Apr 2025 14:46:43 +0200
Subject: [PATCH v2 2/4] gpio: deprecate devm_gpiod_unhinge()
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X-Developer-Key: i=bartosz.golaszewski@linaro.org; a=openpgp;
fpr=169DEB6C0BC3C46013D2C79F11A72EA01471D772
From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
This function was introduced as a workaround for an issue with resource
ownership in the regulator subsystem. Rather than passing the ownership
of a GPIO, we should make the regulator core be able to deal with
resources it didn't request. Deprecate this function so that we don't
get more users in the tree.
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
---
drivers/gpio/gpiolib-devres.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/gpio/gpiolib-devres.c b/drivers/gpio/gpiolib-devres.c
index 08205f355ceb..120d1ec5af3b 100644
--- a/drivers/gpio/gpiolib-devres.c
+++ b/drivers/gpio/gpiolib-devres.c
@@ -317,11 +317,15 @@ EXPORT_SYMBOL_GPL(devm_gpiod_put);
* @dev: GPIO consumer
* @desc: GPIO descriptor to remove resource management from
*
+ * *DEPRECATED*
+ * This function should not be used. It's been provided as a workaround for
+ * resource ownership issues in the regulator framework and should be repl=
aced
+ * with a better solution.
+ *
* Remove resource management from a GPIO descriptor. This is needed when
* you want to hand over lifecycle management of a descriptor to another
* mechanism.
*/
-
void devm_gpiod_unhinge(struct device *dev, struct gpio_desc *desc)
{
int ret;
--=20
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From: Bartosz Golaszewski <brgl@bgdev.pl>
Date: Tue, 01 Apr 2025 14:46:44 +0200
Subject: [PATCH v2 3/4] MAINTAINERS: add more keywords for the GPIO
subsystem entry
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To: Linus Walleij <linus.walleij@linaro.org>,
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From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Add GPIOD_FLAGS_BIT_NONEXCLUSIVE and devm_gpiod_unhinge as keywords to
the GPIO entry so that we get notified if anybody tries to use these
deprecated symbols. We'll drop them from here once we remove them from
the kernel.
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
---
MAINTAINERS | 2 ++
1 file changed, 2 insertions(+)
diff --git a/MAINTAINERS b/MAINTAINERS
index ce2b64f4568d..0ce265332577 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -10151,6 +10151,8 @@ 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
+K: devm_gpiod_unhinge
=20
GPIO UAPI
M: Bartosz Golaszewski <brgl@bgdev.pl>
--=20
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From: Bartosz Golaszewski <brgl@bgdev.pl>
Date: Tue, 01 Apr 2025 14:46:45 +0200
Subject: [PATCH v2 4/4] gpio: TODO: track the removal of regulator-related
workarounds
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fpr=169DEB6C0BC3C46013D2C79F11A72EA01471D772
From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
The GPIOD_FLAGS_BIT_NONEXCLUSIVE flag and devm_gpiod_unhinge() function
should be replaced with a better solution. The pwrseq subsystem is a good
candidate. GPIOs themselves should remain a unique resource. Add a task
for tracking the removal of these deprecated symbols.
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
---
drivers/gpio/TODO | 34 ++++++++++++++++++++++++++++++++++
1 file changed, 34 insertions(+)
diff --git a/drivers/gpio/TODO b/drivers/gpio/TODO
index b5f0a7a2e1bf..4b70cbaa1caa 100644
--- a/drivers/gpio/TODO
+++ b/drivers/gpio/TODO
@@ -186,3 +186,37 @@ 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
+
+GPIOs in the linux kernel are meant to be an exclusive resource. This means
+that the GPIO descriptors (the software representation of the hardware con=
cept)
+are not reference counted and - in general - only one user at a time can
+request a GPIO line and control its settings. The consumer API is designed
+around full control of the line's state as evidenced by the fact that, for
+instance, gpiod_set_value() does indeed drive the line as requested, inste=
ad
+of bumping an enable counter of some sort.
+
+A problematic use-case for GPIOs is when two consumers want to use the same
+descriptor independently. An example of such a user is the regulator subsy=
stem
+which may instantiate several struct regulator_dev instances containing
+a struct device but using the same enable GPIO line.
+
+A workaround was introduced in the form of the GPIOD_FLAGS_BIT_NONEXCLUSIVE
+flag but its implementation is problematic: it does not provide any
+synchronization of usage nor did it introduce any enable count meaning the
+non-exclusive users of the same descriptor will in fact "fight" for the
+control over it. This flag should be removed and replaced with a better
+solution, possibly based on the new power sequencing subsystem.
+
+--------------------------------------------------------------------------=
-----
+
+Remove devm_gpiod_unhinge()
+
+devm_gpiod_unhinge() is provided as a way to transfer the ownership of man=
aged
+enable GPIOs to the regulator core. Rather than doing that however, we sho=
uld
+make it possible for the regulator subsystem to deal with GPIO resources t=
he
+lifetime of which it doesn't control as logically, a GPIO obtained by a ca=
ller
+should also be freed by it.
--=20
2.45.2