mb/google/zork: Modify variant to Shuboz support

1. Add ELAN touchscreen/touchpad to overridetree.cb
2. Follow Dalboz setting to add variant.c

BUG=b:174528384
BRANCH=zork
TEST=emerge-zork coreboot

Signed-off-by: Kane Chen <kane_chen@pegatron.corp-partner.google.com>
Change-Id: Ic3193ca7957251841e75a7e5c7a16fc5047919fb
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48001
Reviewed-by: Martin Roth <martinroth@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/zork/variants/shuboz/Makefile.inc

@@ -2,3 +2,4 @@
 
 subdirs-y += ./spd
 ramstage-y += gpio.c
+ramstage-y += variant.c

src/mainboard/google/zork/variants/shuboz/overridetree.cb

@@ -22,12 +22,16 @@ chip soc/amd/picasso
 
 	register "i2c[2]" = "{
 		.speed = I2C_SPEED_FAST,
+		.rise_time_ns = 18,  /* 0 to 2.31 (3.3 * .7) */
+		.fall_time_ns = 57,  /* 2.31 to 0 */
 	}"
 
 	# I2C3 for H1
 
 	register "i2c[3]" = "{
 		.speed = I2C_SPEED_FAST,
+		.rise_time_ns = 184, /* 0 to 1.26v (1.8 * .7) */
+		.fall_time_ns = 42,  /* 1.26v to 0 */
 		.early_init = true,
 	}"
 
@@ -37,6 +41,25 @@ chip soc/amd/picasso
 	end # domain
 
 	device mmio 0xfedc4000 on # APU_I2C2_BASE
+		chip drivers/i2c/generic
+			register "hid" = ""ELAN0001""
+			register "desc" = ""ELAN Touchscreen""
+			register "probed" = "1"
+			register "irq_gpio" = "ACPI_GPIO_IRQ_LEVEL_LOW(GPIO_12)"
+			register "enable_gpio" = "ACPI_GPIO_OUTPUT_ACTIVE_HIGH(GPIO_32)"
+			register "enable_delay_ms" = "1"
+			register "reset_gpio" = "ACPI_GPIO_OUTPUT_ACTIVE_LOW(GPIO_140)"
+			register "reset_delay_ms" = "20"
+			register "has_power_resource" = "1"
+			device i2c 10 on end
+		end
+		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 # device
-
 end	# chip soc/amd/picasso

src/mainboard/google/zork/variants/shuboz/variant.c

@@ -0,0 +1,33 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <baseboard/variants.h>
+#include <soc/pci_devs.h>
+
+static const fsp_ddi_descriptor hdmi_ddi_descriptors[] = {
+	{ // DDI0, DP0, eDP
+		.connector_type = EDP,
+		.aux_index = AUX1,
+		.hdp_index = HDP1
+	},
+	{ // DDI1, DP1, DB OPT2 USB-C1 / DB OPT3 MST hub
+		.connector_type = DP,
+		.aux_index = AUX2,
+		.hdp_index = HDP2
+	},
+	{ // DDI2, DP3, USB-C0
+		.connector_type = DP,
+		.aux_index = AUX4,
+		.hdp_index = HDP4,
+	}
+};
+
+void variant_get_dxio_ddi_descriptors(const fsp_dxio_descriptor **dxio_descs,
+				      size_t *dxio_num,
+				      const fsp_ddi_descriptor **ddi_descs,
+				      size_t *ddi_num)
+{
+	*dxio_descs = baseboard_get_dxio_descriptors(dxio_num);
+
+	*ddi_descs = &hdmi_ddi_descriptors[0];
+	*ddi_num = ARRAY_SIZE(hdmi_ddi_descriptors);
+}