Change in coreboot[master]: mb/system76/lemp9: Configure IRQs as level triggered for HID over I2C

[Karthik Ramasubramanian (Code Review)]

Attention is currently required from: Jeremy Soller.
Karthik Ramasubramanian has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/50452 )

Change subject: mb/system76/lemp9: Configure IRQs as level triggered for HID over I2C
......................................................................

mb/system76/lemp9: Configure IRQs as level triggered for HID over I2C

As per HID over I2C Protocol Specification[1] Version 1.00 Section 7.4,
the interrupt line used by the device is required to be level triggered.
Hence, this change updates the configuration of the HID over I2C devices
to be level triggered.

References:
[1] http://download.microsoft.com/download/7/d/d/7dd44bb7-2a7a-4505-ac1c-7227d3d...

BUG=b:172846122
TEST=./util/abuild/abuild

Change-Id: Ice096777077bd2e9cfbaf744371fc372c0c05606
Signed-off-by: Karthikeyan Ramasubramanian 
---
M src/mainboard/system76/lemp9/devicetree.cb
1 file changed, 1 insertion(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/52/50452/1

diff --git a/src/mainboard/system76/lemp9/devicetree.cb b/src/mainboard/system76/lemp9/devicetree.cb
index 3a0758a..263036d 100644
--- a/src/mainboard/system76/lemp9/devicetree.cb
+++ b/src/mainboard/system76/lemp9/devicetree.cb
@@ -97,7 +97,7 @@
    		chip drivers/i2c/hid
    			register "generic.hid" = ""ELAN040D""
    			register "generic.desc" = ""ELAN Touchpad""
-				register "generic.irq" = "ACPI_IRQ_EDGE_LOW(GPP_B3_IRQ)"
+				register "generic.irq" = "ACPI_IRQ_LEVEL_LOW(GPP_B3_IRQ)"
    			register "generic.probed" = "1"
    			register "hid_desc_reg_offset" = "0x01"
    			device i2c 15 on end