gpio: Avoid kernel.h inclusion where it's possible

Inclusion of kernel.h increases the mess with the header dependencies.
Avoid kernel.h inclusion where it's possible.

Besides that, clean up a bit other inclusions inside GPIO subsystem headers.
It includes:
 - removal pin control bits (forward declaration and header) from linux/gpio.h
 - removal of.h from asm-generic/gpio.h
 - use of explicit headers in gpio/consumer.h
 - add FIXME note with regard to gpio.h inclusion in of_gpio,h

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20200205134336.20197-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 6 insertions, 3 deletions

diff --git a/include/linux/of_gpio.h b/include/linux/of_gpio.h
index 16967390a3fe..f821095218b0 100644
--- a/include/linux/of_gpio.h
+++ b/include/linux/of_gpio.h
@@ -11,9 +11,8 @@
 #define __LINUX_OF_GPIO_H
 
 #include <linux/compiler.h>
-#include <linux/kernel.h>
-#include <linux/errno.h>
-#include <linux/gpio.h>
+#include <linux/gpio/driver.h>
+#include <linux/gpio.h>		/* FIXME: Shouldn't be here */
 #include <linux/of.h>
 
 struct device_node;
@@ -34,6 +33,8 @@ enum of_gpio_flags {
 
 #ifdef CONFIG_OF_GPIO
 
+#include <linux/kernel.h>
+
 /*
  * OF GPIO chip for memory mapped banks
  */
@@ -63,6 +64,8 @@ extern void of_mm_gpiochip_remove(struct of_mm_gpio_chip *mm_gc);
 
 #else /* CONFIG_OF_GPIO */
 
+#include <linux/errno.h>
+
 /* Drivers may not strictly depend on the GPIO support, so let them link. */
 static inline int of_get_named_gpio_flags(struct device_node *np,
 		const char *list_name, int index, enum of_gpio_flags *flags)