mainboard/google/soraka: add wacom touchscreen support

Add wacom touchscreen support.

BUG=b:37007801, b:37265219
BRANCH=None
TEST=manual testing on Soraka board to ensue that touchscreen works
at boot and after suspend/resume.

Change-Id: I0fbae4782c6442149cda57d23c61ed87546621bb
Signed-off-by: Wisley Chen <wisley.chen@quantatw.com>
Reviewed-on: https://review.coreboot.org/20476
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
diff --git a/src/mainboard/google/poppy/variants/soraka/devicetree.cb b/src/mainboard/google/poppy/variants/soraka/devicetree.cb
index 58287fa..9b8a18c 100644
--- a/src/mainboard/google/poppy/variants/soraka/devicetree.cb
+++ b/src/mainboard/google/poppy/variants/soraka/devicetree.cb
@@ -214,6 +214,20 @@
 		device pci 14.1 off end # USB xDCI (OTG)
 		device pci 14.2 on  end # Thermal Subsystem
 		device pci 15.0 on
+			chip drivers/i2c/hid
+				register "generic.hid" = ""WCOMCOHO""
+				register "generic.desc" = ""WCOM Touchscreen""
+				register "generic.irq" = "ACPI_IRQ_LEVEL_LOW(GPP_E7_IRQ)"
+				register "generic.probed" = "1"
+				register "generic.reset_gpio" = "ACPI_GPIO_OUTPUT_ACTIVE_LOW(GPP_E3)"
+				register "generic.reset_delay_ms" = "110"
+				register "generic.enable_gpio" = "ACPI_GPIO_OUTPUT_ACTIVE_HIGH(GPP_C22)"
+				register "generic.enable_delay_ms" = "1"
+				register "generic.has_power_resource" = "1"
+				register "generic.disable_gpio_export_in_crs" = "1"
+				register "hid_desc_reg_offset" = "0x1"
+				device i2c 0xA on end
+			end
 			chip drivers/i2c/generic
 				register "hid" = ""ATML0001""
 				register "desc" = ""Atmel Touchscreen""