diff --git a/src/mainboard/siemens/mc_apl1/variants/mc_apl4/Kconfig b/src/mainboard/siemens/mc_apl1/variants/mc_apl4/Kconfig
index 6f600c70be..4942624ff1 100644
--- a/src/mainboard/siemens/mc_apl1/variants/mc_apl4/Kconfig
+++ b/src/mainboard/siemens/mc_apl1/variants/mc_apl4/Kconfig
@@ -3,6 +3,7 @@ if BOARD_SIEMENS_MC_APL4
 
 config BOARD_SPECIFIC_OPTIONS
 	def_bool y
+	select DRIVERS_I2C_GENERIC
 	select DRIVER_INTEL_I210
 	select SOC_INTEL_SET_MIN_CLOCK_RATIO
 	select MAINBOARD_HAS_TPM2
diff --git a/src/mainboard/siemens/mc_apl1/variants/mc_apl4/devicetree.cb b/src/mainboard/siemens/mc_apl1/variants/mc_apl4/devicetree.cb
index c601106c5e..f997d08433 100644
--- a/src/mainboard/siemens/mc_apl1/variants/mc_apl4/devicetree.cb
+++ b/src/mainboard/siemens/mc_apl1/variants/mc_apl4/devicetree.cb
@@ -38,6 +38,16 @@ chip soc/intel/apollolake
 	# 0:HS400(Default), 1:HS200, 2:DDR50
 	register "emmc_host_max_speed" = "1"
 
+	# I2C7 controller used for PTN
+	register "common_soc_config" = "{
+		.i2c[7] = {
+			.speed = I2C_SPEED_STANDARD,
+			.rise_time_ns = 210,
+			.fall_time_ns = 100,
+			.data_hold_time_ns = 300,
+		}
+	}"
+
 	device domain 0 on
 		device pci 00.0 on  end	# - Host Bridge
 		device pci 00.1 off end	# - DPTF
@@ -94,6 +104,13 @@ chip soc/intel/apollolake
 			chip drivers/i2c/ptn3460
 				device i2c 0x60 on end  # PTN3460 DP2LVDS Bridge
 			end
+			# Add dummy I2C device to limit BUS speed to 100 kHz in OS
+			chip drivers/i2c/generic
+				register "hid" = ""PRP0001""
+				register "speed" = "I2C_SPEED_STANDARD"
+				device i2c 0x7f on end
+			end
+
 		end
 		device pci 18.0 on  end	# - UART 0
 		device pci 18.1 on  end	# - UART 1
diff --git a/src/mainboard/siemens/mc_apl1/variants/mc_apl7/Kconfig b/src/mainboard/siemens/mc_apl1/variants/mc_apl7/Kconfig
index 953dcfd484..76abd138c1 100644
--- a/src/mainboard/siemens/mc_apl1/variants/mc_apl7/Kconfig
+++ b/src/mainboard/siemens/mc_apl1/variants/mc_apl7/Kconfig
@@ -3,6 +3,7 @@ if BOARD_SIEMENS_MC_APL7
 
 config BOARD_SPECIFIC_OPTIONS
 	def_bool y
+	select DRIVERS_I2C_GENERIC
 	select DRIVER_INTEL_I210
 	select SOC_INTEL_SET_MIN_CLOCK_RATIO
 	select DRIVERS_I2C_PTN3460
diff --git a/src/mainboard/siemens/mc_apl1/variants/mc_apl7/devicetree.cb b/src/mainboard/siemens/mc_apl1/variants/mc_apl7/devicetree.cb
index c879fef3ed..b3775bd7a6 100644
--- a/src/mainboard/siemens/mc_apl1/variants/mc_apl7/devicetree.cb
+++ b/src/mainboard/siemens/mc_apl1/variants/mc_apl7/devicetree.cb
@@ -38,6 +38,16 @@ chip soc/intel/apollolake
 	# 0:HS400(Default), 1:HS200, 2:DDR50
 	register "emmc_host_max_speed" = "1"
 
+	# I2C7 controller used for PTN
+	register "common_soc_config" = "{
+		.i2c[7] = {
+			.speed = I2C_SPEED_STANDARD,
+			.rise_time_ns = 210,
+			.fall_time_ns = 100,
+			.data_hold_time_ns = 300,
+		}
+	}"
+
 	device domain 0 on
 		device pci 00.0 on  end	# - Host Bridge
 		device pci 00.1 off end	# - DPTF
@@ -92,6 +102,12 @@ chip soc/intel/apollolake
 			chip drivers/i2c/ptn3460
 				device i2c 0x60 on end  # PTN3460 DP2LVDS Bridge
 			end
+			# Add dummy I2C device to limit BUS speed to 100 kHz in OS
+			chip drivers/i2c/generic
+				register "hid" = ""PRP0001""
+				register "speed" = "I2C_SPEED_STANDARD"
+				device i2c 0x7f on end
+			end
 		end
 		device pci 18.0 on  end	# - UART 0
 		device pci 18.1 on  end	# - UART 1