diff --git a/src/mainboard/google/reef/variants/pyro/devicetree.cb b/src/mainboard/google/reef/variants/pyro/devicetree.cb
index 0e71398d6a..7405b37edc 100644
--- a/src/mainboard/google/reef/variants/pyro/devicetree.cb
+++ b/src/mainboard/google/reef/variants/pyro/devicetree.cb
@@ -66,8 +66,51 @@ chip soc/intel/apollolake
 	register "gpe0_dw2" = "PMC_GPE_N_63_32"
 	register "gpe0_dw3" = "PMC_GPE_SW_31_0"
 
-	# Enable I2C2 bus early for TPM access
-	register "i2c[2].early_init" = "1"
+	# Limit I2C0 Audio codec da7219 speed to 400kHz with manually tuned values.
+	register "i2c[0]" = "{
+		.speed = I2C_SPEED_FAST,
+		.speed_config[0] = {
+			.speed = I2C_SPEED_FAST,
+			.scl_lcnt = 0xd0,
+			.scl_hcnt = 0x68,
+			.sda_hold = 0x27,
+		}
+	}"
+
+	# Enable I2C2 bus early for TPM access and configure as 400kHz
+	# with manually tuned values.
+	register "i2c[2]" = "{
+		.early_init = 1,
+		.speed = I2C_SPEED_FAST,
+		.speed_config[0] = {
+			.speed = I2C_SPEED_FAST,
+			.scl_lcnt = 0xd0,
+			.scl_hcnt = 0x68,
+			.sda_hold = 0x27,
+		}
+	}"
+
+	# Limit I2C3 WACOM touchscreen speed to 400kHz with manually tuned values.
+	register "i2c[3]" = "{
+		.speed = I2C_SPEED_FAST,
+		.speed_config[0] = {
+			.speed = I2C_SPEED_FAST,
+			.scl_lcnt = 0xd0,
+			.scl_hcnt = 0x68,
+			.sda_hold = 0x27,
+		}
+	}"
+
+	# Limit trackpad speed to 400kHz with manually tuned values.
+	register "i2c[4]" = "{
+		.speed = I2C_SPEED_FAST,
+		.speed_config[0] = {
+			.speed = I2C_SPEED_FAST,
+			.scl_lcnt = 0xd0,
+			.scl_hcnt = 0x68,
+			.sda_hold = 0x27,
+		}
+	}"
 
 	# Minimum SLP S3 assertion width 28ms.
 	register "slp_s3_assertion_width_usecs" = "28000"