gpiolib: move gpiolib-sysfs function declarations into their own header

Move gpiolib-sysfs function declarations into their own header.

These functions are in gpiolib-sysfs.c, and are only required by gpiolib.c,
and so should be in a module header, not gpiolib.h.

This brings gpiolib-sysfs into line with gpiolib-cdev, and is another step
towards removing the sysfs inferface.
Signed-off-by: Kent Gibson <warthog618@gmail.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

drivers/gpio/gpiolib-sysfs.c

@@ -11,6 +11,7 @@
 #include <linux/ctype.h>
 
 #include "gpiolib.h"
+#include "gpiolib-sysfs.h"
 
 #define GPIO_IRQF_TRIGGER_FALLING	BIT(0)
 #define GPIO_IRQF_TRIGGER_RISING	BIT(1)

drivers/gpio/gpiolib-sysfs.h

+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef GPIOLIB_SYSFS_H
+#define GPIOLIB_SYSFS_H
+
+#ifdef CONFIG_GPIO_SYSFS
+
+int gpiochip_sysfs_register(struct gpio_device *gdev);
+void gpiochip_sysfs_unregister(struct gpio_device *gdev);
+
+#else
+
+static inline int gpiochip_sysfs_register(struct gpio_device *gdev)
+{
+	return 0;
+}
+
+static inline void gpiochip_sysfs_unregister(struct gpio_device *gdev)
+{
+}
+
+#endif /* CONFIG_GPIO_SYSFS */
+
+#endif /* GPIOLIB_SYSFS_H */

drivers/gpio/gpiolib.c

@@ -26,6 +26,7 @@
 #include "gpiolib-of.h"
 #include "gpiolib-acpi.h"
 #include "gpiolib-cdev.h"
+#include "gpiolib-sysfs.h"
 
 #define CREATE_TRACE_POINTS
 #include <trace/events/gpio.h>

drivers/gpio/gpiolib.h

@@ -175,22 +175,4 @@ static inline int gpio_chip_hwgpio(const struct gpio_desc *desc)
 #define chip_dbg(gc, fmt, ...)					\
 	dev_dbg(&gc->gpiodev->dev, "(%s): " fmt, gc->label, ##__VA_ARGS__)
 
-#ifdef CONFIG_GPIO_SYSFS
-
-int gpiochip_sysfs_register(struct gpio_device *gdev);
-void gpiochip_sysfs_unregister(struct gpio_device *gdev);
-
-#else
-
-static inline int gpiochip_sysfs_register(struct gpio_device *gdev)
-{
-	return 0;
-}
-
-static inline void gpiochip_sysfs_unregister(struct gpio_device *gdev)
-{
-}
-
-#endif /* CONFIG_GPIO_SYSFS */
-
 #endif /* GPIOLIB_H */