headers: don't depend on errno.h being available
These headers follow the pattern:
| #if CONFIG_IS_ENABLED(FANCY_FEATURE)
| void foo(void);
| #else
| static inline void foo(void) { return -ENOSYS; }
| #endif
In the #else path ENOSYS is used, however linux/errno.h is not included.
If errno.h has not been included already the compiler errors out even
if the inline function is not referenced.
Make those headers self contained.
Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>
Reviewed-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/include/power-domain.h b/include/power-domain.h
index 2ff6c77..1852507 100644
--- a/include/power-domain.h
+++ b/include/power-domain.h
@@ -6,6 +6,8 @@
#ifndef _POWER_DOMAIN_H
#define _POWER_DOMAIN_H
+#include <linux/errno.h>
+
/**
* A power domain is a portion of an SoC or chip that is powered by a
* switchable source of power. In many cases, software has control over the