gpiolib: make legacy interfaces optional

The traditional interfaces are only used on a small number of ancient
boards. Make these optional now so they can be disabled by default.

Signed-off-by: Arnd Bergmann <[email protected]>
Reviewed-by: Alexander Sverdlin <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Bartosz Golaszewski <[email protected]>

Author: arndb

drivers/gpio/Kconfig

@@ -14,6 +14,9 @@ menuconfig GPIOLIB
 
 if GPIOLIB
 
+config GPIOLIB_LEGACY
+	def_bool y
+
 config GPIOLIB_FASTPATH_LIMIT
 	int "Maximum number of GPIOs for fast path"
 	range 32 512

drivers/gpio/Makefile

@@ -5,7 +5,7 @@ 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_LEGACY)	+= gpiolib-legacy.o
 obj-$(CONFIG_OF_GPIO)		+= gpiolib-of.o
 obj-$(CONFIG_GPIO_CDEV)		+= gpiolib-cdev.o
 obj-$(CONFIG_GPIO_SYSFS)	+= gpiolib-sysfs.o

include/linux/gpio.h

@@ -13,6 +13,11 @@
 #define __LINUX_GPIO_H
 
 #include <linux/types.h>
+#ifdef CONFIG_GPIOLIB
+#include <linux/gpio/consumer.h>
+#endif
+
+#ifdef CONFIG_GPIOLIB_LEGACY
 
 struct device;
 
@@ -22,9 +27,6 @@ struct device;
 #define GPIOF_OUT_INIT_HIGH	((0 << 0) | (1 << 1))
 
 #ifdef CONFIG_GPIOLIB
-
-#include <linux/gpio/consumer.h>
-
 /*
  * "valid" GPIO numbers are nonnegative and may be passed to
  * setup routines like gpio_request().  Only some valid numbers
@@ -170,5 +172,5 @@ static inline int devm_gpio_request_one(struct device *dev, unsigned gpio,
 }
 
 #endif /* ! CONFIG_GPIOLIB */
-
+#endif /* CONFIG_GPIOLIB_LEGACY */
 #endif /* __LINUX_GPIO_H */