mainboard/google/kahlee: Enable EC wake on GPIO24

The grunt EC uses GPIO24 (EC_PCH_WAKE_L) to signal wake-up events to the AP.
On Stoney, GPIO24 maps to GEVENT (GPE) 15.

The kahlee EC uses GPIO2 (EC_PCH_WAKE_L) to signal wake-up events to the AP.
On Stoney, GPIO2 maps to GEVENT (GPE) 8.

BUG=b:78461678
TEST=powerd_dbus_suspend, tap any key on keyboard wakes from S3.
TEST=sign in, EC: lidclose, EC: lidopen => system wakes from S3.

Change-Id: Ib1809740837e686992ff70b81933159a5dff7595
Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Reviewed-on: https://review.coreboot.org/25816
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>

src/mainboard/google/kahlee/variants/baseboard/gpio.c

@@ -20,6 +20,7 @@
 #include <soc/southbridge.h>
 #include <stdlib.h>
 #include <boardid.h>
+#include <variant/gpio.h>
 
 /*
  * As a rule of thumb, GPIO pins used by coreboot should be initialized at
@@ -498,6 +499,14 @@ static const struct sci_source gpe_table[] = {
 		.level = SMI_SCI_EDG,
 	},
 
+	/* EC_PCH_WAKE_L */
+	{
+		.scimap = EC_WAKE_GPI,
+		.gpe = EC_WAKE_GPI,
+		.direction = SMI_SCI_LVL_LOW,
+		.level = SMI_SCI_EDG,
+	},
+
 	/* H1_PCH_INT_ODL */
 	{
 		.scimap = 22,

src/mainboard/google/kahlee/variants/baseboard/include/baseboard/ec.h

@@ -58,6 +58,7 @@
 
 /* Enable LID switch */
 #define EC_ENABLE_LID_SWITCH
+#define EC_ENABLE_WAKE_PIN EC_WAKE_GPI
 
 /* Enable EC backed ALS device in ACPI */
 #define EC_ENABLE_ALS_DEVICE

src/mainboard/google/kahlee/variants/baseboard/include/baseboard/gpio.h

@@ -42,5 +42,6 @@
 /* These define the GPE, not the GPIO. */
 #define EC_SCI_GPI		3	/* AGPIO 22 -> GPE  3 */
 #define EC_SMI_GPI		10	/* AGPIO 6  -> GPE 10 */
+#define EC_WAKE_GPI		15	/* AGPIO 24 -> GPE 15 */
 
 #endif /* __BASEBOARD_GPIO_H__ */

src/mainboard/google/kahlee/variants/kahlee/include/variant/gpio.h

@@ -46,5 +46,6 @@
 /* These define the GPE, not the GPIO. */
 #define EC_SCI_GPI		3	/* AGPIO 22 -> GPE  3 */
 #define EC_SMI_GPI		10	/* AGPIO  6 -> GPE 10 */
+#define EC_WAKE_GPI		8	/* AGPIO  2 -> GPE  8 */
 
 #endif /* __VARIANT_GPIO_H__ */