diff --git a/src/mainboard/google/myst/variants/myst/overridetree.cb b/src/mainboard/google/myst/variants/myst/overridetree.cb
index 4433d9ac53..cd3314a4a7 100644
--- a/src/mainboard/google/myst/variants/myst/overridetree.cb
+++ b/src/mainboard/google/myst/variants/myst/overridetree.cb
@@ -34,4 +34,32 @@ end
 
 chip soc/amd/phoenix
 	device domain 0 on end # domain
+	device ref i2c_3 on
+		chip drivers/i2c/generic
+			register "hid" = ""RTL5682""
+			register "name" = ""RT58""
+			register "desc" = ""Realtek RT5682""
+			register "irq_gpio" = "ACPI_GPIO_IRQ_EDGE_BOTH(GPIO_89)"
+			register "property_count" = "1"
+			register "property_list[0].type" = "ACPI_DP_TYPE_INTEGER"
+			register "property_list[0].name" = ""realtek,jd-src""
+			register "property_list[0].integer" = "1"
+			register "detect" = "1"
+			device i2c 1a on end
+		end
+		chip drivers/i2c/generic
+			register "hid" = ""10EC1019""
+			register "desc" = ""Realtek SPK AMP R""
+			register "uid" = "1"
+			register "detect" = "1"
+			device i2c 29 on end
+		end
+		chip drivers/i2c/generic
+			register "hid" = ""10EC1019""
+			register "desc" = ""Realtek SPK AMP L""
+			register "uid" = "2"
+			register "detect" = "1"
+			device i2c 2a on end
+		end
+	end # I2C3
 end	# chip soc/amd/phoenix