diff --git a/arch/arm/src/lpc54xx/lpc54_sdmmc.c b/arch/arm/src/lpc54xx/lpc54_sdmmc.c
index 4b42f23de3f..d79c6312646 100644
--- a/arch/arm/src/lpc54xx/lpc54_sdmmc.c
+++ b/arch/arm/src/lpc54xx/lpc54_sdmmc.c
@@ -1309,7 +1309,7 @@ static void lpc54_clock(FAR struct sdio_dev_s *dev, enum sdio_clock_e rate)
 
   lpc54_setclock(clkdiv);
 
-  /* Enable disable clock */
+  /* Enable the new clock */
 
   lpc54_sdcard_clock(enabled);
 }
diff --git a/configs/lpcxpresso-lpc54628/include/board.h b/configs/lpcxpresso-lpc54628/include/board.h
index b5c7c68ede5..b94d5f2ebdb 100644
--- a/configs/lpcxpresso-lpc54628/include/board.h
+++ b/configs/lpcxpresso-lpc54628/include/board.h
@@ -196,10 +196,14 @@
 /* SD/MMC or SDIO interface
  *
  * NOTE: The SDIO function clock to the interface can be up to 50 MHZ.
+ * Example:  BOARD_MAIN_CLK=220MHz, CLKDIV=5
  */
 
+#define BOARD_SDMMC_MAXFREQ      50000000
+#define BOARD_SDMMC_CEIL(a,b)    (((a) + (b) - 1) / (b))
+
 #define BOARD_SDMMC_CLKSRC       SYSCON_SDIOCLKSEL_MAINCLK
-#define BOARD_SDMMC_CLKDIV       (BOARD_MAIN_CLK / 50000000)
+#define BOARD_SDMMC_CLKDIV       BOARD_SDMMC_CEIL(BOARD_MAIN_CLK, BOARD_SDMMC_MAXFREQ)
 #define BOARD_SDMMC_FREQUENCY    (BOARD_MAIN_CLK / BOARD_SDMMC_CLKDIV)
 
 /* LED definitions *********************************************************/