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gpiolib: make cdev a build option

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Make the gpiolib-cdev module a build option.  This allows the CDEV
interface to be removed from the kernel to reduce kernel size in
applications where is it not required, and provides the parent for
other CDEV interface specific build options to follow.

Suggested-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Kent Gibson <warthog618@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
This commit is contained in:
Kent Gibson 2020-09-28 08:27:52 +08:00 committed by Bartosz Golaszewski
parent b53911aa87
commit d143493c01
3 changed files with 31 additions and 3 deletions
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17
drivers/gpio/Kconfig
View file

@ -66,8 +66,21 @@ config GPIO_SYSFS
This ABI is deprecated. If you want to use GPIO from userspace,
use the character device /dev/gpiochipN with the appropriate
ioctl() operations instead. The character device is always
available.
ioctl() operations instead.
config GPIO_CDEV
bool
prompt "Character device (/dev/gpiochipN) support" if EXPERT
default y
help
Say Y here to add the character device /dev/gpiochipN interface
for GPIOs. The character device allows userspace to control GPIOs
using ioctl() operations.
Only say N if you are sure that the GPIO character device is not
required.
If unsure, say Y.
config GPIO_GENERIC
depends on HAS_IOMEM # Only for IOMEM drivers

2
drivers/gpio/Makefile
View file

@ -6,8 +6,8 @@ ccflags-$(CONFIG_DEBUG_GPIO) += -DDEBUG
obj-$(CONFIG_GPIOLIB) += gpiolib.o
obj-$(CONFIG_GPIOLIB) += gpiolib-devres.o
obj-$(CONFIG_GPIOLIB) += gpiolib-legacy.o
obj-$(CONFIG_GPIOLIB) += gpiolib-cdev.o
obj-$(CONFIG_OF_GPIO) += gpiolib-of.o
obj-$(CONFIG_GPIO_CDEV) += gpiolib-cdev.o
obj-$(CONFIG_GPIO_SYSFS) += gpiolib-sysfs.o
obj-$(CONFIG_GPIO_ACPI) += gpiolib-acpi.o

15
drivers/gpio/gpiolib-cdev.h
View file

@ -5,7 +5,22 @@
#include <linux/device.h>
#ifdef CONFIG_GPIO_CDEV
int gpiolib_cdev_register(struct gpio_device *gdev, dev_t devt);
void gpiolib_cdev_unregister(struct gpio_device *gdev);
#else
static inline int gpiolib_cdev_register(struct gpio_device *gdev, dev_t devt)
{
return 0;
}
static inline void gpiolib_cdev_unregister(struct gpio_device *gdev)
{
}
#endif /* CONFIG_GPIO_CDEV */
#endif /* GPIOLIB_CDEV_H */