gpio: introduce a header for symbols shared by suppliers and consumers

GPIO_LINE_DIRECTION_IN/OUT definitions are used both in supplier (GPIO
controller drivers) as well as consumer code. In order to not force the
consumers to include gpio/driver.h or - even worse - to redefine these
values, create a new header file - gpio/defs.h - and move them over
there. Include this header from both gpio/consumer.h and gpio/driver.h.

Reviewed-by: Linus Walleij <linusw@kernel.org>
Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/20260223172006.204268-1-bartosz.golaszewski@oss.qualcomm.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>

include/linux/gpio/consumer.h

@@ -6,6 +6,8 @@
 #include <linux/err.h>
 #include <linux/types.h>
 
+#include "defs.h"
+
 struct acpi_device;
 struct device;
 struct fwnode_handle;

include/linux/gpio/defs.h

@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __LINUX_GPIO_DEFS_H
+#define __LINUX_GPIO_DEFS_H
+
+#define GPIO_LINE_DIRECTION_IN		1
+#define GPIO_LINE_DIRECTION_OUT		0
+
+#endif /* __LINUX_GPIO_DEFS_H */

include/linux/gpio/driver.h

@@ -20,6 +20,8 @@
 #include <asm/msi.h>
 #endif
 
+#include "defs.h"
+
 struct device;
 struct irq_chip;
 struct irq_data;
@@ -42,9 +44,6 @@ union gpio_irq_fwspec {
 #endif
 };
 
-#define GPIO_LINE_DIRECTION_IN	1
-#define GPIO_LINE_DIRECTION_OUT	0
-
 /**
  * struct gpio_irq_chip - GPIO interrupt controller
  */