Change in coreboot[master]: google/Nauilus: add synaptics touch screen support

[Chris Wang (Code Review)]

Hello Chris Wang,

I'd like you to do a code review. Please visit

https://review.coreboot.org/22613

to review the following change.

Change subject: google/Nauilus: add synaptics touch screen support
......................................................................

google/Nauilus: add synaptics touch screen support

1.change the GPP_C22 GPIO setting to enable touchscreen.

2.add synaptics touchscreen in the device tree so that the correct ACPI
device is created.

BUG=b:66462881
BRANCH=master
TEST=compiled/verified.

Change-Id: I6e89a5db0e9f8ae777eed661f3bf89d653a937e6
Signed-off-by: Chris Wang 
---
M src/mainboard/google/poppy/variants/nautilus/devicetree.cb
M src/mainboard/google/poppy/variants/nautilus/gpio.c
2 files changed, 11 insertions(+), 2 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/13/22613/1

diff --git a/src/mainboard/google/poppy/variants/nautilus/devicetree.cb b/src/mainboard/google/poppy/variants/nautilus/devicetree.cb
index efaea3f..5e3db21 100644
--- a/src/mainboard/google/poppy/variants/nautilus/devicetree.cb
+++ b/src/mainboard/google/poppy/variants/nautilus/devicetree.cb
@@ -231,7 +231,16 @@
    	device pci 14.0 on  end # USB xHCI
    	device pci 14.1 off end # USB xDCI (OTG)
    	device pci 14.2 on  end # Thermal Subsystem
-		device pci 15.0 on  end # I2C #0
+		device pci 15.0 on
+			chip drivers/i2c/hid
+				register "generic.hid" = ""SYTS7813""
+				register "generic.desc" = ""Synaptics Touchscreen""
+				register "generic.irq" = "ACPI_IRQ_EDGE_LOW(GPP_E7_IRQ)"
+				register "generic.probed" = "1"
+				register "hid_desc_reg_offset" = "0x20"
+				device i2c 20 on end
+			end
+		end # I2C #0
    	device pci 15.1 on
    		chip drivers/i2c/tpm
    			register "hid" = ""GOOG0005""
diff --git a/src/mainboard/google/poppy/variants/nautilus/gpio.c b/src/mainboard/google/poppy/variants/nautilus/gpio.c
index 51d3b77..cd384ec 100644
--- a/src/mainboard/google/poppy/variants/nautilus/gpio.c
+++ b/src/mainboard/google/poppy/variants/nautilus/gpio.c
@@ -156,7 +156,7 @@
    /* C21 : UART2_TXD ==> CHP3_TX_SERVO_RX_UART */
    PAD_CFG_NF(GPP_C21, NONE, DEEP, NF1),
    /* C22 : UART2_RTS# ==> CHP3_P3.3V_DX_TSP_EN */
-	PAD_CFG_GPO(GPP_C22, 0, DEEP),
+	PAD_CFG_GPO(GPP_C22, 1, DEEP),
    /* C23 : UART2_CTS# ==> CHP3_PCH_WP*/
    PAD_CFG_GPI(GPP_C23, 20K_PU, DEEP),