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kernel: use fwnode for GPIO export driver

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Upstream prefers more generic fwnode/device handlers as opposed to OF
ones.

Signed-off-by: Rosen Penev <rosenp@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/24176
Signed-off-by: Jonas Jelonek <jelonek.jonas@gmail.com>
This commit is contained in:
Rosen Penev authored and Jonas Jelonek committed 2026-07-22 10:14:05 +02:00
1 parent 4ff901f165
commit 0ca7895173
2 files changed
+40 -62
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target/linux/generic/hack-6.12/800-GPIO-add-named-gpio-exports.patch
+20 -31
View File
@@ -15,7 +15,7 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
#include "gpiolib.h"
#include "gpiolib-of.h"
@@ -1205,3 +1207,72 @@ void of_gpiochip_remove(struct gpio_chip
@@ -1205,3 +1207,61 @@ void of_gpiochip_remove(struct gpio_chip
of_node_put(np);
}
@@ -29,50 +29,39 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
+
+static int of_gpio_export_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct device *dev = &pdev->dev;
+ u32 val;
+ int nb = 0;
+
+ for_each_child_of_node_scoped(np, cnp) {
+ device_for_each_child_node_scoped(dev, child) {
+ struct gpio_desc *desc;
+ const char *name = NULL;
+ int gpio;
+ bool dmc;
+ int max_gpio = 1;
+ int i;
+ enum gpiod_flags dflags;
+ int i = 0;
+
+ of_property_read_string(cnp, "gpio-export,name", &name);
+ if (!fwnode_property_read_u32(child, "gpio-export,output", &val))
+ dflags = val ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
+ else
+ dflags = GPIOD_IN;
+
+ if (!name)
+ max_gpio = of_gpio_named_count(cnp, "gpios");
+
+ for (i = 0; i < max_gpio; i++) {
+ struct gpio_desc *desc;
+ unsigned flags = 0;
+ enum of_gpio_flags of_flags;
+
+ desc = of_get_named_gpiod_flags(cnp, "gpios", i, &of_flags);
+ fwnode_property_read_string(child, "gpio-export,name", &name);
+ while (true) {
+ desc = devm_fwnode_gpiod_get_index(dev, child, NULL, i, dflags,
+ name ? name : fwnode_get_name(child));
+ if (PTR_ERR(desc) == -ENOENT)
+ break;
+ if (IS_ERR(desc))
+ return PTR_ERR(desc);
+ gpio = desc_to_gpio(desc);
+
+ if (of_flags & OF_GPIO_ACTIVE_LOW)
+ flags |= GPIOF_ACTIVE_LOW;
+
+ if (!of_property_read_u32(cnp, "gpio-export,output", &val))
+ flags |= val ? GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
+ else
+ flags |= GPIOF_IN;
+
+ if (devm_gpio_request_one(&pdev->dev, gpio, flags, name ? name : of_node_full_name(np)))
+ continue;
+
+ dmc = of_property_read_bool(cnp, "gpio-export,direction_may_change");
+ gpio_export_with_name(gpio_to_desc(gpio), dmc, name);
+ dmc = fwnode_property_present(child, "gpio-export,direction_may_change");
+ gpio_export_with_name(desc, dmc, name);
+ nb++;
+ i++;
+ }
+ }
+
+ dev_info(&pdev->dev, "%d gpio(s) exported\n", nb);
+ dev_info(dev, "%d gpio(s) exported\n", nb);
+
+ return 0;
+}
target/linux/generic/hack-6.18/800-GPIO-add-named-gpio-exports.patch
+20 -31
View File
@@ -15,7 +15,7 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
#include "gpiolib.h"
#include "gpiolib-of.h"
@@ -1302,3 +1304,72 @@ bool of_gpiochip_instance_match(struct g
@@ -1302,3 +1304,61 @@ bool of_gpiochip_instance_match(struct g
return false;
}
@@ -29,50 +29,39 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
+
+static int of_gpio_export_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct device *dev = &pdev->dev;
+ u32 val;
+ int nb = 0;
+
+ for_each_child_of_node_scoped(np, cnp) {
+ device_for_each_child_node_scoped(dev, child) {
+ struct gpio_desc *desc;
+ const char *name = NULL;
+ int gpio;
+ bool dmc;
+ int max_gpio = 1;
+ int i;
+ enum gpiod_flags dflags;
+ int i = 0;
+
+ of_property_read_string(cnp, "gpio-export,name", &name);
+ if (!fwnode_property_read_u32(child, "gpio-export,output", &val))
+ dflags = val ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
+ else
+ dflags = GPIOD_IN;
+
+ if (!name)
+ max_gpio = of_gpio_named_count(cnp, "gpios");
+
+ for (i = 0; i < max_gpio; i++) {
+ struct gpio_desc *desc;
+ unsigned flags = 0;
+ enum of_gpio_flags of_flags;
+
+ desc = of_get_named_gpiod_flags(cnp, "gpios", i, &of_flags);
+ fwnode_property_read_string(child, "gpio-export,name", &name);
+ while (true) {
+ desc = devm_fwnode_gpiod_get_index(dev, child, NULL, i, dflags,
+ name ? name : fwnode_get_name(child));
+ if (PTR_ERR(desc) == -ENOENT)
+ break;
+ if (IS_ERR(desc))
+ return PTR_ERR(desc);
+ gpio = desc_to_gpio(desc);
+
+ if (!of_property_read_u32(cnp, "gpio-export,output", &val))
+ flags |= val ? GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
+ else
+ flags |= GPIOF_IN;
+
+ if (devm_gpio_request_one(&pdev->dev, gpio, flags, name ? name : of_node_full_name(np)))
+ continue;
+
+ if (of_flags & OF_GPIO_ACTIVE_LOW)
+ gpiod_toggle_active_low(gpio_to_desc(gpio));
+
+ dmc = of_property_read_bool(cnp, "gpio-export,direction_may_change");
+ gpio_export_with_name(gpio_to_desc(gpio), dmc, name);
+ dmc = fwnode_property_present(child, "gpio-export,direction_may_change");
+ gpio_export_with_name(desc, dmc, name);
+ nb++;
+ i++;
+ }
+ }
+
+ dev_info(&pdev->dev, "%d gpio(s) exported\n", nb);
+ dev_info(dev, "%d gpio(s) exported\n", nb);
+
+ return 0;
+}