mb/google/nocturne: Define GPP_D17 as EC_SYNC_IRQ

Use GPIO GPP_D17 pin as the EC sync interrupt and provide this value
to the embedded controller to be exported to the OS.

This interface was tested on a reworked Nocturne board with modified
EC and a modified kernel driver to ensure that the interrupt asserts
as expected and can be used by the kernel driver.

Change-Id: Ie2b33692367b5d9ecc2b128180d8cfe4f6b347b1
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: https://review.coreboot.org/28759
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/mainboard/google/poppy/variants/nocturne/gpio.c

@@ -196,7 +196,7 @@ static const struct pad_config gpio_table[] = {
 	/* D16 : ISH_UART0_CTS# ==> RCAM_RST_L */
 	PAD_CFG_GPO(GPP_D16, 0, DEEP),
 	/* D17 : DMIC_CLK1 ==> EC_PCH_ARCORE_INT_L */
-	PAD_CFG_NC(GPP_D17),
+	PAD_CFG_GPI_APIC(GPP_D17, NONE, PLTRST),
 	/* D18 : DMIC_DATA1 ==> TP131 */
 	PAD_CFG_NC(GPP_D18),
 	/* D19 : DMIC_CLK0 ==> PCH_DMIC_CLK_OUT */

src/mainboard/google/poppy/variants/nocturne/include/variant/ec.h

@@ -79,4 +79,7 @@
 #define EC_ENABLE_MKBP_DEVICE  /* Enable cros_ec_keyb device */
 #define EC_ENABLE_CBAS_DEVICE  /* Enable "Base Attached Switch" device */
 
+/* Enable EC sync interrupt, EC_SYNC_IRQ is defined in variant/gpio.h */
+#define EC_ENABLE_SYNC_IRQ
+
 #endif /* __MAINBOARD_EC_H__ */

src/mainboard/google/poppy/variants/nocturne/include/variant/gpio.h

@@ -34,6 +34,9 @@
 /* EC wake is LAN_WAKE# which is a special DeepSX wake pin */
 #define GPE_EC_WAKE		GPE0_LAN_WAK
 
+/* EC sync irq is GPP_D12 */
+#define EC_SYNC_IRQ		GPP_D17_IRQ
+
 /* eSPI virtual wire reporting */
 #define EC_SCI_GPI		GPE0_ESPI