diff --git a/fboss/platform/platform_manager/PciExplorer.cpp b/fboss/platform/platform_manager/PciExplorer.cpp
index 49ddd24798ddd..60286e79e5dfc 100644
--- a/fboss/platform/platform_manager/PciExplorer.cpp
+++ b/fboss/platform/platform_manager/PciExplorer.cpp
@@ -246,6 +246,9 @@ std::vector<uint16_t> PciExplorer::createI2cAdapter(
     uint32_t instanceId) {
   auto auxData = getAuxData(*i2cAdapterConfig.fpgaIpBlockConfig(), instanceId);
   auxData.i2c_data.num_channels = *i2cAdapterConfig.numberOfAdapters();
+  if (i2cAdapterConfig.busFreqHz().has_value()) {
+    auxData.i2c_data.bus_freq_hz = *i2cAdapterConfig.busFreqHz();
+  }
   create(pciDevice, *i2cAdapterConfig.fpgaIpBlockConfig(), auxData);
   return getI2cAdapterBusNums(pciDevice, i2cAdapterConfig, instanceId);
 }
diff --git a/fboss/platform/platform_manager/Utils.cpp b/fboss/platform/platform_manager/Utils.cpp
index a76b3076bacff..431669ec930fb 100644
--- a/fboss/platform/platform_manager/Utils.cpp
+++ b/fboss/platform/platform_manager/Utils.cpp
@@ -287,6 +287,10 @@ std::vector<I2cAdapterConfig> Utils::createI2cAdapterConfigs(
       i2cAdapterConfig.numberOfAdapters() =
           *i2cAdapterBlockConfig.numBusesPerAdapter();
 
+      if (i2cAdapterBlockConfig.busFreqHz().has_value()) {
+        i2cAdapterConfig.busFreqHz() = *i2cAdapterBlockConfig.busFreqHz();
+      }
+
       i2cAdapterConfigs.push_back(i2cAdapterConfig);
     }
   }
diff --git a/fboss/platform/platform_manager/platform_manager_config.thrift b/fboss/platform/platform_manager/platform_manager_config.thrift
index 0d23d58469fad..fc20795a7d99a 100644
--- a/fboss/platform/platform_manager/platform_manager_config.thrift
+++ b/fboss/platform/platform_manager/platform_manager_config.thrift
@@ -320,9 +320,12 @@ struct FpgaIpBlockConfig {
 // `fpgaIpBlockConfig`: See FgpaIpBlockConfig above
 //
 // `numberOfAdapters`: Number of I2C Adapters created by this block.
+//
+// `busFreqHz`: I2C bus clock frequency in Hz. Applies to all buses in this block.
 struct I2cAdapterConfig {
   1: FpgaIpBlockConfig fpgaIpBlockConfig;
   2: i32 numberOfAdapters;
+  3: optional i32 busFreqHz;
 }
 
 // Defines generic I2C Adapter block in FPGAs.
@@ -366,6 +369,8 @@ struct I2cAdapterConfig {
 //  adapterIndex=2, startAdapterIndex=1:
 //    iobufOffsetCalc: "0x2000 + 1*0x100"
 //    iobufOffsetCalc: "0x2100"
+//
+// `busFreqHz`: I2C bus clock frequency in Hz. Applies to all buses in this block.
 struct I2cAdapterBlockConfig {
   1: string pmUnitScopedNamePrefix;
   2: string deviceName;
@@ -374,6 +379,7 @@ struct I2cAdapterBlockConfig {
   5: i32 numAdapters;
   6: i32 numBusesPerAdapter = 1;
   7: string iobufOffsetCalc;
+  8: optional i32 busFreqHz;
 }
 
 // Defines a Spi Device in FPGAs.