fix build warnings

1 files changed, 3 insertions, 3 deletions

diff --git a/src/device/dcd.h b/src/device/dcd.h
index 4e9cfd5d5..18a708347 100644
--- a/src/device/dcd.h
+++ b/src/device/dcd.h
@@ -108,15 +108,15 @@ typedef struct TU_ATTR_ALIGNED(4)
 
 // clean/flush data cache: write cache -> memory.
 // Required before an DMA TX transfer to make sure data is in memory
-void dcd_dcache_clean(void* addr, uint32_t data_size) TU_ATTR_WEAK;
+void dcd_dcache_clean(void const* addr, uint32_t data_size) TU_ATTR_WEAK;
 
 // invalidate data cache: mark cache as invalid, next read will read from memory
 // Required BOTH before and after an DMA RX transfer
-void dcd_dcache_invalidate(void* addr, uint32_t data_size) TU_ATTR_WEAK;
+void dcd_dcache_invalidate(void const* addr, uint32_t data_size) TU_ATTR_WEAK;
 
 // clean and invalidate data cache
 // Required before an DMA transfer where memory is both read/write by DMA
-void dcd_dcache_clean_invalidate(void* addr, uint32_t data_size) TU_ATTR_WEAK;
+void dcd_dcache_clean_invalidate(void const* addr, uint32_t data_size) TU_ATTR_WEAK;
 
 //--------------------------------------------------------------------+
 // Controller API