diff --git a/Source/rewrite-hoc-clk/sysmodule/src/board/board_load.cpp b/Source/rewrite-hoc-clk/sysmodule/src/board/board_load.cpp
index 44b29611..9aac2980 100644
--- a/Source/rewrite-hoc-clk/sysmodule/src/board/board_load.cpp
+++ b/Source/rewrite-hoc-clk/sysmodule/src/board/board_load.cpp
@@ -117,7 +117,6 @@ namespace board {
             default:
                 ASSERT_ENUM_VALID(SysClkPartLoad, loadSource);
         }
-
         return 0;
     }
 
diff --git a/Source/rewrite-hoc-clk/sysmodule/src/board/board_volt.cpp b/Source/rewrite-hoc-clk/sysmodule/src/board/board_volt.cpp
index 27a210a8..8be8b891 100644
--- a/Source/rewrite-hoc-clk/sysmodule/src/board/board_volt.cpp
+++ b/Source/rewrite-hoc-clk/sysmodule/src/board/board_volt.cpp
@@ -30,6 +30,45 @@
 
 namespace board {
 
+    /*
+    * Switch Power domains (max77620):
+    * Name  | Usage         | uV step | uV min | uV default | uV max  | Init
+    *-------+---------------+---------+--------+------------+---------+------------------
+    *  sd0  | SoC           | 12500   | 600000 |  625000    | 1400000 | 1.125V (pkg1.1)
+    *  sd1  | SDRAM         | 12500   | 600000 | 1125000    | 1125000 | 1.1V   (pkg1.1)
+    *  sd2  | ldo{0-1, 7-8} | 12500   | 600000 | 1325000    | 1350000 | 1.325V (pcv)
+    *  sd3  | 1.8V general  | 12500   | 600000 | 1800000    | 1800000 |
+    *  ldo0 | Display Panel | 25000   | 800000 | 1200000    | 1200000 | 1.2V   (pkg1.1)
+    *  ldo1 | XUSB, PCIE    | 25000   | 800000 | 1050000    | 1050000 | 1.05V  (pcv)
+    *  ldo2 | SDMMC1        | 50000   | 800000 | 1800000    | 3300000 |
+    *  ldo3 | GC ASIC       | 50000   | 800000 | 3100000    | 3100000 | 3.1V   (pcv)
+    *  ldo4 | RTC           | 12500   | 800000 |  850000    |  850000 | 0.85V  (AO, pcv)
+    *  ldo5 | GC Card       | 50000   | 800000 | 1800000    | 1800000 | 1.8V   (pcv)
+    *  ldo6 | Touch, ALS    | 50000   | 800000 | 2900000    | 2900000 | 2.9V   (pcv)
+    *  ldo7 | XUSB          | 50000   | 800000 | 1050000    | 1050000 | 1.05V  (pcv)
+    *  ldo8 | XUSB, DP, MCU | 50000   | 800000 | 1050000    | 2800000 | 1.05V/2.8V (pcv)
+
+    typedef enum {
+        PcvPowerDomainId_Max77620_Sd0  = 0x3A000080,
+        PcvPowerDomainId_Max77620_Sd1  = 0x3A000081, // vdd2
+        PcvPowerDomainId_Max77620_Sd2  = 0x3A000082,
+        PcvPowerDomainId_Max77620_Sd3  = 0x3A000083,
+        PcvPowerDomainId_Max77620_Ldo0 = 0x3A0000A0,
+        PcvPowerDomainId_Max77620_Ldo1 = 0x3A0000A1,
+        PcvPowerDomainId_Max77620_Ldo2 = 0x3A0000A2,
+        PcvPowerDomainId_Max77620_Ldo3 = 0x3A0000A3,
+        PcvPowerDomainId_Max77620_Ldo4 = 0x3A0000A4,
+        PcvPowerDomainId_Max77620_Ldo5 = 0x3A0000A5,
+        PcvPowerDomainId_Max77620_Ldo6 = 0x3A0000A6,
+        PcvPowerDomainId_Max77620_Ldo7 = 0x3A0000A7,
+        PcvPowerDomainId_Max77620_Ldo8 = 0x3A0000A8,
+        PcvPowerDomainId_Max77621_Cpu  = 0x3A000003,
+        PcvPowerDomainId_Max77621_Gpu  = 0x3A000004,
+        PcvPowerDomainId_Max77812_Cpu  = 0x3A000003,
+        PcvPowerDomainId_Max77812_Gpu  = 0x3A000004,
+        PcvPowerDomainId_Max77812_Dram = 0x3A000005, // vddq
+    } PowerDomainId;
+    */
     u32 GetVoltage(HocClkVoltage voltage) {
         RgltrSession session;
         Result rc = 0;