[PATCH 3/6] firmware: semihosting: don't return error code from writec/write0

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

As described in the "ARM Compiler toolchain Developing Software
for ARM Processors Version 5.0" document[1], SYS_WRITE0 and SYS_WRITEC
corrupt the R0 register, unlike the other calls that return negative
error codes. Therefore change the return type to void.

[1]: https://developer.arm.com/documentation/dui0471/i/semihosting/sys-write0--0x04-?lang=en

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 drivers/firmware/semihosting.c    | 8 ++++----
 include/asm-generic/semihosting.h | 4 ++--
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/firmware/semihosting.c b/drivers/firmware/semihosting.c
index a037a95a1077..1dfbdf219727 100644
--- a/drivers/firmware/semihosting.c
+++ b/drivers/firmware/semihosting.c
@@ -91,15 +91,15 @@ int semihosting_close(int fd)
 }
 EXPORT_SYMBOL(semihosting_close);
 
-int semihosting_writec(char c)
+void semihosting_writec(char c)
 {
-	return semihosting_trap(SEMIHOSTING_SYS_WRITEC, &c);
+	(void)semihosting_trap(SEMIHOSTING_SYS_WRITEC, &c);
 }
 EXPORT_SYMBOL(semihosting_writec);
 
-int semihosting_write0(const char *str)
+void semihosting_write0(const char *str)
 {
-	return semihosting_trap(SEMIHOSTING_SYS_WRITE0, (void *)str);
+	(void)semihosting_trap(SEMIHOSTING_SYS_WRITE0, (void *)str);
 }
 EXPORT_SYMBOL(semihosting_write0);
 
diff --git a/include/asm-generic/semihosting.h b/include/asm-generic/semihosting.h
index b745f8831977..67031c331b97 100644
--- a/include/asm-generic/semihosting.h
+++ b/include/asm-generic/semihosting.h
@@ -7,8 +7,8 @@
 
 int semihosting_open(const char *fname, int flags);
 int semihosting_close(int fd);
-int semihosting_writec(char c);
-int semihosting_write0(const char *str);
+void semihosting_writec(char c);
+void semihosting_write0(const char *str);
 ssize_t semihosting_write(int fd, const void *buf, size_t count);
 ssize_t semihosting_read(int fd, void *buf, size_t count);
 int semihosting_readc(void);
-- 
2.39.2