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/spi-mem.h b/include/spi-mem.h
index b07cf2e..3c8e95b 100644
--- a/include/spi-mem.h
+++ b/include/spi-mem.h
@@ -11,6 +11,8 @@
#ifndef __UBOOT_SPI_MEM_H
#define __UBOOT_SPI_MEM_H
+#include <linux/errno.h>
+
struct udevice;
#define SPI_MEM_OP_CMD(__opcode, __buswidth) \