diff --git a/arch/arm/src/cxd56xx/cxd56_dmac.c b/arch/arm/src/cxd56xx/cxd56_dmac.c
index 54100990dcb..3d7b111782d 100644
--- a/arch/arm/src/cxd56xx/cxd56_dmac.c
+++ b/arch/arm/src/cxd56xx/cxd56_dmac.c
@@ -313,13 +313,13 @@ static int ch2dmac(int ch)
 {
   switch (ch)
     {
-    case 0: case 1:
+      case 0 ... 1:
         return 1;
-    case 2: case 3: case 4: case 5: case 6: /* APP IDMAC */
+      case 2 ... 6: /* APP IDMAC */
         return 3;
-    case 7: case 8: /* APP SKDMAC */
+      case 7 ... 8: /* APP SKDMAC */
         return 2;
-    default:
+      default:
         return 0;
     }
 }
@@ -330,9 +330,12 @@ static struct dmac_register_map *get_device(int ch)
 
   switch (id)
     {
-    case 1: return (struct dmac_register_map *)DMAC1_REG_BASE;
-    case 2: return (struct dmac_register_map *)DMAC2_REG_BASE;
-    case 3: return (struct dmac_register_map *)DMAC3_REG_BASE;
+      case 1:
+        return (struct dmac_register_map *)DMAC1_REG_BASE;
+      case 2:
+        return (struct dmac_register_map *)DMAC2_REG_BASE;
+      case 3:
+        return (struct dmac_register_map *)DMAC3_REG_BASE;
     }
 
     return NULL;
@@ -366,13 +369,13 @@ static int get_pmid(int ch)
 {
   switch (ch)
     {
-    case 0: case 1:
+      case 0 ... 1:
         return PM_APP_ADMAC;
-    case 2: case 3: case 4: case 5: case 6:
+      case 2 ... 6:
         return PM_APP_IDMAC;
-    case 7: case 8:
+      case 7 ... 8:
         return PM_APP_SKDMAC;
-    default:
+      default:
         break; /* may not comes here */
     }