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

[Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>]

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.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
---
Andy, Linus: I'm no longer sure who proposed it but I've had it on my
TODO list. Please feel free to take credit below.

 include/linux/gpio/consumer.h | 2 ++
 include/linux/gpio/defs.h     | 9 +++++++++
 include/linux/gpio/driver.h   | 5 ++---
 3 files changed, 13 insertions(+), 3 deletions(-)
 create mode 100644 include/linux/gpio/defs.h

diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h
index 0d84085829186..3efb5cb1e1d16 100644
--- a/include/linux/gpio/consumer.h
+++ b/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;
diff --git a/include/linux/gpio/defs.h b/include/linux/gpio/defs.h
new file mode 100644
index 0000000000000..b69fd7c041b28
--- /dev/null
+++ b/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 */
diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
index fabe2baf7b509..5f5ddcbfa4459 100644
--- a/include/linux/gpio/driver.h
+++ b/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
  */
-- 
2.47.3