Change in coreboot[master]: google/snappy: Add MELFAS touch screen support

[Kevin Chiu (Code Review)]

Kevin Chiu has uploaded this change for review. ( https://review.coreboot.org/21067

Change subject: google/snappy: Add MELFAS touch screen support
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google/snappy: Add MELFAS touch screen support

Current fw does not create ACPI device for
OS to recognize MELFAS touchscreen.

List the touch screen in the devicetree so that
the correct ACPI device are created.

BUG=b:64779224
BRANCH=reef
TEST=emerge-snappy coreboot
Change-Id: If2bc910d641e0cf2b120ed883c5788542959f568
Signed-off-by: Kevin Chiu 
---
M src/mainboard/google/reef/variants/snappy/devicetree.cb
1 file changed, 7 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/67/21067/1

diff --git a/src/mainboard/google/reef/variants/snappy/devicetree.cb b/src/mainboard/google/reef/variants/snappy/devicetree.cb
index d888896..e0182dd 100644
--- a/src/mainboard/google/reef/variants/snappy/devicetree.cb
+++ b/src/mainboard/google/reef/variants/snappy/devicetree.cb
@@ -193,6 +193,13 @@
    			register "has_power_resource" = "1"
    			device i2c 10 on end
    		end
+                        chip drivers/i2c/generic
+                                register "hid" = ""MLFS0000""
+                                register "desc" = ""Melfas Touchscreen""
+                                register "irq" = "ACPI_IRQ_EDGE_LOW(GPIO_21_IRQ)"
+                                register "probed" = "1"
+                                device i2c 34 on end
+                        end
    		chip drivers/i2c/hid
    			register "generic.hid" = ""WDHT0002""
    			register "generic.desc" = ""WDT Touchscreen""