[PATCH RESEND v3] fpga: add inline stub for fpga_load

[Eugen Hristev]

In case CC_OPTIMIZE_FOR_DEBUG is set, unused code will not be optimized out,
hence the reference to fpga_load will be compiled.
if DM_FPGA and SPL_FPGA are not set, the build will fail with :

aarch64-none-linux-gnu-ld.bfd: common/spl/spl_fit.o: in function `spl_fit_upload_fpga':
u-boot/common/spl/spl_fit.c:595: undefined reference to `fpga_load'

To solve this, added an inline empty stub in the header if
CC_OPTIMIZE_FOR_DEBUG is set such that the build will succeed.

Signed-off-by: Eugen Hristev <eugen.hristev at collabora.com>
---
Changes in v3:
- return -ENOSYS
Changes in v2:
- this is a rework as suggested by Simon of this previous patch :
https://patchwork.ozlabs.org/project/uboot/patch/20230619102839.277902-1-eugen.hristev@collabora.com/

 include/fpga.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/fpga.h b/include/fpga.h
index ed688cc0fa3b..33d0dbbe2ba4 100644
--- a/include/fpga.h
+++ b/include/fpga.h
@@ -60,8 +60,17 @@ int fpga_add(fpga_type devtype, void *desc);
 int fpga_count(void);
 const fpga_desc *const fpga_get_desc(int devnum);
 int fpga_is_partial_data(int devnum, size_t img_len);
+#if defined(CONFIG_CC_OPTIMIZE_FOR_DEBUG)
+static inline int fpga_load(int devnum, const void *buf, size_t bsize,
+			    bitstream_type bstype, int flags)
+{
+	return -ENOSYS;
+}
+#else
 int fpga_load(int devnum, const void *buf, size_t bsize,
 	      bitstream_type bstype, int flags);
+#endif
+
 int fpga_fsload(int devnum, const void *buf, size_t size,
 		fpga_fs_info *fpga_fsinfo);
 int fpga_loads(int devnum, const void *buf, size_t size,
-- 
2.34.1