The patch below does not apply to the 6.6-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y git checkout FETCH_HEAD git cherry-pick -x c6ccc4dde17676dfe617b9a37bd9ba19a8fc87ee # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2025092939-unsafe-alfalfa-105c@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^..
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From c6ccc4dde17676dfe617b9a37bd9ba19a8fc87ee Mon Sep 17 00:00:00 2001 From: Hans de Goede hansg@kernel.org Date: Sat, 20 Sep 2025 22:09:55 +0200 Subject: [PATCH] gpiolib: Extend software-node support to support secondary software-nodes
When a software-node gets added to a device which already has another fwnode as primary node it will become the secondary fwnode for that device.
Currently if a software-node with GPIO properties ends up as the secondary fwnode then gpiod_find_by_fwnode() will fail to find the GPIOs.
Add a new gpiod_fwnode_lookup() helper which falls back to calling gpiod_find_by_fwnode() with the secondary fwnode if the GPIO was not found in the primary fwnode.
Fixes: e7f9ff5dc90c ("gpiolib: add support for software nodes") Cc: stable@vger.kernel.org Signed-off-by: Hans de Goede hansg@kernel.org Reviewed-by: Dmitry Torokhov dmitry.torokhov@gmail.com Link: https://lore.kernel.org/r/20250920200955.20403-1-hansg@kernel.org Signed-off-by: Bartosz Golaszewski bartosz.golaszewski@linaro.org
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 0d2b470a252e..74d54513730a 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -4604,6 +4604,23 @@ static struct gpio_desc *gpiod_find_by_fwnode(struct fwnode_handle *fwnode, return desc; }
+static struct gpio_desc *gpiod_fwnode_lookup(struct fwnode_handle *fwnode, + struct device *consumer, + const char *con_id, + unsigned int idx, + enum gpiod_flags *flags, + unsigned long *lookupflags) +{ + struct gpio_desc *desc; + + desc = gpiod_find_by_fwnode(fwnode, consumer, con_id, idx, flags, lookupflags); + if (gpiod_not_found(desc) && !IS_ERR_OR_NULL(fwnode)) + desc = gpiod_find_by_fwnode(fwnode->secondary, consumer, con_id, + idx, flags, lookupflags); + + return desc; +} + struct gpio_desc *gpiod_find_and_request(struct device *consumer, struct fwnode_handle *fwnode, const char *con_id, @@ -4622,8 +4639,8 @@ struct gpio_desc *gpiod_find_and_request(struct device *consumer, int ret = 0;
scoped_guard(srcu, &gpio_devices_srcu) { - desc = gpiod_find_by_fwnode(fwnode, consumer, con_id, idx, - &flags, &lookupflags); + desc = gpiod_fwnode_lookup(fwnode, consumer, con_id, idx, + &flags, &lookupflags); if (gpiod_not_found(desc) && platform_lookup_allowed) { /* * Either we are not using DT or ACPI, or their lookup