Change in coreboot[master]: mb/google/guybrush: Add Elan Touchpad configuration

[Karthik Ramasubramanian (Code Review)]

Karthik Ramasubramanian has submitted this change. ( https://review.coreboot.org/c/coreboot/+/51962 )

Change subject: mb/google/guybrush: Add Elan Touchpad configuration
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mb/google/guybrush: Add Elan Touchpad configuration

Enable Touchpad by configuring the enable GPIO to logic high. Add
touchpad configuration for ELAN touchpad.

BUG=b:182207444
TEST=Build and boot to OS in Guybrush. Ensure that the trackpad events
are detected using evtest.

Change-Id: Ib47fbb33f2b181eb85f6ded98a5b0ce08fbc7b64
Signed-off-by: Karthikeyan Ramasubramanian 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51962
Reviewed-by: Mathew King 
Tested-by: build bot (Jenkins) 
---
M src/mainboard/google/guybrush/variants/baseboard/gpio.c
M src/mainboard/google/guybrush/variants/guybrush/overridetree.cb
2 files changed, 11 insertions(+), 1 deletion(-)

Approvals:
  build bot (Jenkins): Verified
  Mathew King: Looks good to me, approved

diff --git a/src/mainboard/google/guybrush/variants/baseboard/gpio.c b/src/mainboard/google/guybrush/variants/baseboard/gpio.c
index e386658..ba392b4 100644
--- a/src/mainboard/google/guybrush/variants/baseboard/gpio.c
+++ b/src/mainboard/google/guybrush/variants/baseboard/gpio.c
@@ -22,7 +22,7 @@
    /* EN_PP3300_WLAN */
    PAD_GPO(GPIO_6, LOW),
    /* EN_PP3300_TCHPAD */
-	PAD_GPO(GPIO_7, LOW),
+	PAD_GPO(GPIO_7, HIGH),
    /* EN_PWR_WWAN_X */
    PAD_GPO(GPIO_8, LOW),
    /* SOC_TCHPAD_INT_ODL */
diff --git a/src/mainboard/google/guybrush/variants/guybrush/overridetree.cb b/src/mainboard/google/guybrush/variants/guybrush/overridetree.cb
index 286ba28..5f9b037 100644
--- a/src/mainboard/google/guybrush/variants/guybrush/overridetree.cb
+++ b/src/mainboard/google/guybrush/variants/guybrush/overridetree.cb
@@ -61,4 +61,14 @@
    	.early_init = true,
    }"

+	device ref i2c_0 on
+		chip drivers/i2c/generic
+			register "hid" = ""ELAN0000""
+			register "desc" = ""ELAN Touchpad""
+			register "irq_gpio" = "ACPI_GPIO_IRQ_EDGE_LOW(GPIO_9)"
+			register "wake" = "GEVENT_22"
+			register "probed" = "1"
+			device i2c 15 on end
+		end
+	end # I2C0
 end	# chip soc/amd/cezanne