mb/google/dedede: Create dita variant

Create the dita variant of the taranza project by
copying the files to a new directory named for the variant.

BUG=b:317292413
BRANCH=dedede
TEST=util/abuild/abuild -p none -t google/dedede -x -a
make sure the build includes GOOGLE_DITA

Signed-off-by: Sheng-Liang Pan <sheng-liang.pan@quanta.corp-partner.google.com>
Change-Id: I843e33f30cd356e4f12330bdfe2d53a0b3920ef3
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79655
Reviewed-by: Derek Huang <derekhuang@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: David Wu <david_wu@quanta.corp-partner.google.com>

10 files changed, 512 insertions, 0 deletions

diff --git a/src/mainboard/google/dedede/variants/dita/Makefile.inc b/src/mainboard/google/dedede/variants/dita/Makefile.inc
new file mode 100644
index 0000000000..c4bbd20ede
--- /dev/null
+++ b/src/mainboard/google/dedede/variants/dita/Makefile.inc
@@ -0,0 +1,6 @@
+## SPDX-License-Identifier: GPL-2.0-or-later
+
+ramstage-y += gpio.c
+
+ramstage-y += variant.c
+ramstage-y += ramstage.c
diff --git a/src/mainboard/google/dedede/variants/dita/gpio.c b/src/mainboard/google/dedede/variants/dita/gpio.c
new file mode 100644
index 0000000000..2998592756
--- /dev/null
+++ b/src/mainboard/google/dedede/variants/dita/gpio.c
@@ -0,0 +1,108 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <baseboard/gpio.h>
+#include <baseboard/variants.h>
+
+/* Pad configuration in ramstage */
+static const struct pad_config gpio_table[] = {
+	/* A11 : TOUCH_RPT_EN */
+	PAD_NC(GPP_A11, NONE),
+	/* A12 : USB_OC1_N */
+	PAD_CFG_NF(GPP_A12, NONE, DEEP, NF1),
+	/* A13 : USB_OC2_N */
+	PAD_CFG_NF(GPP_A13, NONE, DEEP, NF1),
+	/* A14 : USB_OC3_N */
+	PAD_CFG_NF(GPP_A14, NONE, DEEP, NF1),
+	/* A18 : USB_OC0_N */
+	PAD_CFG_NF(GPP_A18, NONE, DEEP, NF1),
+
+	/* B9 : LAN_CLKREQ_ODL */
+	PAD_CFG_NF(GPP_B9, NONE, DEEP, NF1),
+
+	/* D2  : PWM_PP3300_BUZZER */
+	PAD_CFG_GPO(GPP_D2, 1, DEEP),
+	/* D4  : LAN_PE_ISOLATE_ODL_R */
+	PAD_CFG_GPO(GPP_D4, 1, DEEP),
+	/* D5  : TOUCH_RESET_L */
+	PAD_NC(GPP_D5, NONE),
+	/* D6  : EN_PP3300_TOUCH_S0 */
+	PAD_NC(GPP_D6, NONE),
+	/* D17 : LAN_PERST_L */
+	PAD_CFG_GPO(GPP_D17, 1, PLTRST),
+	/* D19 : WWAN_WLAN_COEX1 */
+	PAD_NC(GPP_D19, NONE),
+	/* D20 : WWAN_WLAN_COEX2 */
+	PAD_NC(GPP_D20, NONE),
+
+	/* E13 : GPP_E13/DDI0_DDC_SCL */
+	PAD_CFG_NF(GPP_E13, NONE, DEEP, NF1),
+	/* E14 : GPP_E14/DDI0_DDC_SDA */
+	PAD_CFG_NF(GPP_E14, NONE, DEEP, NF1),
+	/* E15 : GPP_E15/DDI1_DDC_SCL */
+	PAD_CFG_NF(GPP_E15, NONE, DEEP, NF1),
+	/* E16 : GPP_E16/DDI1_DDC_SDA */
+	PAD_CFG_NF(GPP_E16, NONE, DEEP, NF1),
+
+	/* G0  : SD_CMD */
+	PAD_NC(GPP_G0, NONE),
+	/* G1  : SD_DATA0 */
+	PAD_NC(GPP_G1, NONE),
+	/* G2  : SD_DATA1 */
+	PAD_NC(GPP_G2, NONE),
+	/* G3  : SD_DATA2 */
+	PAD_NC(GPP_G3, NONE),
+	/* G4  : SD_DATA3 */
+	PAD_NC(GPP_G4, NONE),
+	/* G5  : SD_CD_ODL */
+	PAD_NC(GPP_G5, NONE),
+	/* G6  : SD_CLK */
+	PAD_NC(GPP_G6, NONE),
+	/* G7  : SD_SDIO_WP */
+	PAD_NC(GPP_G7, NONE),
+
+	/* H4  : AP_I2C_TS_SDA */
+	PAD_NC(GPP_H4, NONE),
+	/* H5  : AP_I2C_TS_SCL */
+	PAD_NC(GPP_H5, NONE),
+	/* H6  : AP_I2C_CAM_SDA */
+	PAD_NC(GPP_H6, NONE),
+	/* H7  : AP_I2C_CAM_SCL */
+	PAD_NC(GPP_H7, NONE),
+	/* H15 : I2S_SPK_BCLK */
+	PAD_NC(GPP_H15, NONE),
+
+	/* R6  : I2S_SPK_LRCK */
+	PAD_NC(GPP_R6, NONE),
+	/* R7  :  I2S_SPK_AUDIO */
+	PAD_NC(GPP_R7, NONE),
+
+	/* S2  : DMIC1_CLK */
+	PAD_NC(GPP_S2, NONE),
+	/* S3  : DMIC1_DATA */
+	PAD_NC(GPP_S3, NONE),
+	/* S6  :  DMIC0_CLK */
+	PAD_NC(GPP_S6, NONE),
+	/* S7  : DMIC0_DATA */
+	PAD_NC(GPP_S7, NONE),
+};
+
+const struct pad_config *variant_override_gpio_table(size_t *num)
+{
+	*num = ARRAY_SIZE(gpio_table);
+	return gpio_table;
+}
+
+static const gpio_t hpd_gpios[] = {
+	/* HDMI1 */
+	GPP_A17,
+	/* HDMI2 */
+	GPP_A16,
+	/* USB C0 */
+	GPP_B23,
+};
+
+const gpio_t *variant_hpd_gpios(size_t *num)
+{
+	*num = ARRAY_SIZE(hpd_gpios);
+	return hpd_gpios;
+}
diff --git a/src/mainboard/google/dedede/variants/dita/include/variant/ec.h b/src/mainboard/google/dedede/variants/dita/include/variant/ec.h
new file mode 100644
index 0000000000..039e46ba14
--- /dev/null
+++ b/src/mainboard/google/dedede/variants/dita/include/variant/ec.h
@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#ifndef MAINBOARD_EC_H
+#define MAINBOARD_EC_H
+
+#include <baseboard/dibbi/ec.h>
+
+#endif
diff --git a/src/mainboard/google/dedede/variants/dita/include/variant/gpio.h b/src/mainboard/google/dedede/variants/dita/include/variant/gpio.h
new file mode 100644
index 0000000000..9078664608
--- /dev/null
+++ b/src/mainboard/google/dedede/variants/dita/include/variant/gpio.h
@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#ifndef MAINBOARD_GPIO_H
+#define MAINBOARD_GPIO_H
+
+#include <baseboard/gpio.h>
+
+#endif /* MAINBOARD_GPIO_H */
diff --git a/src/mainboard/google/dedede/variants/dita/memory/Makefile.inc b/src/mainboard/google/dedede/variants/dita/memory/Makefile.inc
new file mode 100644
index 0000000000..5175f136a2
--- /dev/null
+++ b/src/mainboard/google/dedede/variants/dita/memory/Makefile.inc
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+# This is an auto-generated file. Do not edit!!
+# Generated by:
+# ./util/spd_tools/bin/part_id_gen JSL lp4x src/mainboard/google/dedede/variants/dita/memory/ src/mainboard/google/dedede/variants/dita/memory/mem_parts_used.txt
+
+SPD_SOURCES =
+SPD_SOURCES += spd/lp4x/set-1/spd-1.hex      # ID = 0(0b0000)  Parts = MT53E512M32D1NP-046 WT:B, K4U6E3S4AB-MGCL, H54G46CYRBX267
+SPD_SOURCES += spd/lp4x/set-1/spd-3.hex      # ID = 1(0b0001)  Parts = K4UBE3D4AB-MGCL, H54G56CYRBX247
diff --git a/src/mainboard/google/dedede/variants/dita/memory/dram_id.generated.txt b/src/mainboard/google/dedede/variants/dita/memory/dram_id.generated.txt
new file mode 100644
index 0000000000..83ae8c397b
--- /dev/null
+++ b/src/mainboard/google/dedede/variants/dita/memory/dram_id.generated.txt
@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+# This is an auto-generated file. Do not edit!!
+# Generated by:
+# ./util/spd_tools/bin/part_id_gen JSL lp4x src/mainboard/google/dedede/variants/dita/memory/ src/mainboard/google/dedede/variants/dita/memory/mem_parts_used.txt
+
+DRAM Part Name                 ID to assign
+MT53E512M32D1NP-046 WT:B       0 (0000)
+K4U6E3S4AB-MGCL                0 (0000)
+K4UBE3D4AB-MGCL                1 (0001)
+H54G46CYRBX267                 0 (0000)
+H54G56CYRBX247                 1 (0001)
diff --git a/src/mainboard/google/dedede/variants/dita/memory/mem_parts_used.txt b/src/mainboard/google/dedede/variants/dita/memory/mem_parts_used.txt
new file mode 100644
index 0000000000..f6f0da6e03
--- /dev/null
+++ b/src/mainboard/google/dedede/variants/dita/memory/mem_parts_used.txt
@@ -0,0 +1,16 @@
+# This is a CSV file containing a list of memory parts used by this variant.
+# One part per line with an optional fixed ID in column 2.
+# Only include a fixed ID if it is required for legacy reasons!
+# Generated IDs are dependent on the order of parts in this file,
+# so new parts must always be added at the end of the file!
+#
+# Generate an updated Makefile.inc and dram_id.generated.txt by running the
+# part_id_gen tool from util/spd_tools.
+# See util/spd_tools/README.md for more details and instructions.
+
+# Part Name
+MT53E512M32D1NP-046 WT:B
+K4U6E3S4AB-MGCL
+K4UBE3D4AB-MGCL
+H54G46CYRBX267
+H54G56CYRBX247
diff --git a/src/mainboard/google/dedede/variants/dita/overridetree.cb b/src/mainboard/google/dedede/variants/dita/overridetree.cb
new file mode 100644
index 0000000000..2b09088eef
--- /dev/null
+++ b/src/mainboard/google/dedede/variants/dita/overridetree.cb
@@ -0,0 +1,304 @@
+chip soc/intel/jasperlake
+
+	# Intel Common SoC Config
+	#+-------------------+---------------------------+
+	#| Field             |  Value                    |
+	#+-------------------+---------------------------+
+	#| GSPI0             | cr50 TPM. Early init is   |
+	#|                   | required to set up a BAR  |
+	#|                   | for TPM communication     |
+	#|                   | before memory is up       |
+	#| I2C4              | Audio                     |
+	#+-------------------+---------------------------+
+	register "common_soc_config" = "{
+		.gspi[0] = {
+			.speed_mhz = 1,
+			.early_init = 1,
+		},
+		.i2c[4] = {
+			.speed_config[0] = {
+				.speed = I2C_SPEED_FAST,
+				.scl_lcnt = 190,
+				.scl_hcnt = 100,
+				.sda_hold = 40,
+			}
+		},
+	}"
+
+	# Power limit config
+	register "power_limits_config[JSL_N4500_6W_CORE]" = "{
+		.tdp_pl1_override = 6,
+		.tdp_pl2_override = 20,
+		.tdp_pl4 = 60,
+	}"
+
+	register "power_limits_config[JSL_N5100_6W_CORE]" = "{
+		.tdp_pl1_override = 6,
+		.tdp_pl2_override = 20,
+		.tdp_pl4 = 60,
+	}"
+
+	# Enable Root Port 3 (index 2) for LAN
+	# External PCIe port 7 is mapped to PCIe Root Port 3
+	register "PcieRpEnable[2]" = "1"
+	register "PcieClkSrcUsage[4]" = "2"
+
+	# Enable Root Port 7 (index 6) for WLAN
+	# External PCIe port 3 is mapped to PCIe Root Port 7
+	register "PcieRpEnable[6]" = "1"
+	register "PcieClkSrcUsage[3]" = "6"
+
+	# Disable PCIe Root Port 8
+	register "PcieRpEnable[7]" = "0"
+
+	# Audio related configurations
+	register "PchHdaAudioLinkDmicEnable[0]" = "0"
+	register "PchHdaAudioLinkDmicEnable[1]" = "0"
+
+	# Disable SD card
+	register "sdcard_cd_gpio" = "0"
+	register "SdCardPowerEnableActiveHigh" = "0"
+
+	# Disable eDP on port A
+	register "DdiPortAConfig" = "0"
+
+	# Enable HPD and DDC for DDI port A
+	register "DdiPortAHpd" = "1"
+	register "DdiPortADdc" = "1"
+
+	# Does not support external vnn power rail
+	register "disable_external_bypass_vr" = "1"
+
+	# USB Port Configuration
+	register "usb2_ports[0]" = "{
+		.enable = 1,
+		.ocpin = OC_SKIP,
+		.tx_bias = USB2_BIAS_0MV,
+		.tx_emp_enable = USB2_PRE_EMP_ON,
+		.pre_emp_bias  = USB2_BIAS_11P25MV,
+		.pre_emp_bit   = USB2_HALF_BIT_PRE_EMP,
+	}" # Type-C Port 0
+	register "usb2_ports[1]" = "{
+		.enable = 1,
+		.ocpin = OC1,
+		.tx_bias = USB2_BIAS_0MV,
+		.tx_emp_enable = USB2_PRE_EMP_ON,
+		.pre_emp_bias  = USB2_BIAS_11P25MV,
+		.pre_emp_bit   = USB2_HALF_BIT_PRE_EMP,
+	}" # Type-A Port A0
+	register "usb2_ports[2]" = "{
+		.enable = 1,
+		.ocpin = OC2,
+		.tx_bias = USB2_BIAS_0MV,
+		.tx_emp_enable = USB2_PRE_EMP_ON,
+		.pre_emp_bias  = USB2_BIAS_11P25MV,
+		.pre_emp_bit   = USB2_HALF_BIT_PRE_EMP,
+	}" # Type-A Port A1
+	register "usb2_ports[3]" = "{
+		.enable = 1,
+		.ocpin = OC3,
+		.tx_bias = USB2_BIAS_0MV,
+		.tx_emp_enable = USB2_PRE_EMP_ON,
+		.pre_emp_bias  = USB2_BIAS_11P25MV,
+		.pre_emp_bit   = USB2_HALF_BIT_PRE_EMP,
+	}" # Type-A Port A2
+	register "usb2_ports[4]" = "{
+		.enable = 1,
+		.ocpin = OC0,
+		.tx_bias = USB2_BIAS_0MV,
+		.tx_emp_enable = USB2_PRE_EMP_ON,
+		.pre_emp_bias  = USB2_BIAS_11P25MV,
+		.pre_emp_bit   = USB2_HALF_BIT_PRE_EMP,
+	}" # Type-A Port A3
+	register "usb2_ports[6]" = "{
+		.enable = 1,
+		.ocpin = OC_SKIP,
+		.tx_bias = USB2_BIAS_0MV,
+		.tx_emp_enable = USB2_PRE_EMP_ON,
+		.pre_emp_bias  = USB2_BIAS_11P25MV,
+		.pre_emp_bit   = USB2_HALF_BIT_PRE_EMP,
+	}" # Type-A Port A4
+
+	register "usb3_ports[1]" = "USB3_PORT_DEFAULT(OC_SKIP)" #  USB3/1 Type-A Port A4
+	register "usb3_ports[4]" = "USB3_PORT_DEFAULT(OC_SKIP)"	# USB3/1 Type-A Port A2
+	register "usb3_ports[5]" = "USB3_PORT_DEFAULT(OC_SKIP)"	# USB3/1 Type-A Port A3
+
+	# Bitmap for Wake Enable on USB attach/detach
+	register "usb2_wake_enable_bitmap" = "USB_PORT_WAKE_ENABLE(1) |
+					      USB_PORT_WAKE_ENABLE(2) |
+					      USB_PORT_WAKE_ENABLE(3) |
+					      USB_PORT_WAKE_ENABLE(4) |
+					      USB_PORT_WAKE_ENABLE(5) |
+					      USB_PORT_WAKE_ENABLE(7)"
+	register "usb3_wake_enable_bitmap" = "USB_PORT_WAKE_ENABLE(1) |
+					      USB_PORT_WAKE_ENABLE(2) |
+					      USB_PORT_WAKE_ENABLE(3) |
+					      USB_PORT_WAKE_ENABLE(4) |
+					      USB_PORT_WAKE_ENABLE(5) |
+					      USB_PORT_WAKE_ENABLE(6)"
+
+	device domain 0 on
+		device pci 04.0 on
+			chip drivers/intel/dptf
+				## Passive Policy
+				register "policies.passive" = "{
+					[0] = DPTF_PASSIVE(CPU, CPU,           90, 10000),
+					[1] = DPTF_PASSIVE(CPU, TEMP_SENSOR_0, 80, 60000),
+					[2] = DPTF_PASSIVE(CPU, TEMP_SENSOR_1, 75, 15000),
+					[3] = DPTF_PASSIVE(CPU, TEMP_SENSOR_2, 55, 15000)
+				}"
+
+				## Critical Policy
+				register "policies.critical" = "{
+					[0] = DPTF_CRITICAL(CPU,           105, SHUTDOWN),
+					[1] = DPTF_CRITICAL(TEMP_SENSOR_0, 90, SHUTDOWN),
+					[2] = DPTF_CRITICAL(TEMP_SENSOR_1, 80, SHUTDOWN),
+					[3] = DPTF_CRITICAL(TEMP_SENSOR_2, 80, SHUTDOWN)
+				}"
+
+				register "controls.power_limits" = "{
+					.pl1 = {
+						.min_power = 3000,
+						.max_power = 6000,
+						.time_window_min = 1 * MSECS_PER_SEC,
+						.time_window_max = 1 * MSECS_PER_SEC,
+						.granularity = 100,
+					},
+					.pl2 = {
+						.min_power = 20000,
+						.max_power = 20000,
+						.time_window_min = 1 * MSECS_PER_SEC,
+						.time_window_max = 1 * MSECS_PER_SEC,
+						.granularity = 1000,
+					}
+				}"
+
+				register "options.tsr[0].desc" = ""Memory""
+				register "options.tsr[1].desc" = ""Power""
+				register "options.tsr[2].desc" = ""Chassis""
+
+				## Charger Performance Control (Control, mA)
+				register "controls.charger_perf" = "{
+					[0] = { 255, 3000 },
+					[1] = {  24, 1500 },
+					[2] = {  16, 1000 },
+					[3] = {   8,  500 }
+				}"
+
+				device generic 0 on end
+			end
+		end # SA Thermal device
+		device pci 14.0 on
+			chip drivers/usb/acpi
+				device usb 0.0 on
+					chip drivers/usb/acpi
+						register "desc" = ""USB2 Type-C Port C0""
+						register "type" = "UPC_TYPE_C_USB2_SS_SWITCH"
+						register "group" = "ACPI_PLD_GROUP(2, 1)"
+						device usb 2.0 on end
+					end
+					chip drivers/usb/acpi
+						register "desc" = ""USB2 Type-A Port A0""
+						register "type" = "UPC_TYPE_A"
+						register "group" = "ACPI_PLD_GROUP(2, 2)"
+						device usb 2.1 on end
+					end
+					chip drivers/usb/acpi
+						register "desc" = ""USB2 Type-A Port A1""
+						register "type" = "UPC_TYPE_A"
+						register "group" = "ACPI_PLD_GROUP(2, 3)"
+						device usb 2.2 on end
+					end
+					chip drivers/usb/acpi
+						register "desc" = ""USB2 Type-A Port A2""
+						register "type" = "UPC_TYPE_A"
+						register "group" = "ACPI_PLD_GROUP(1, 3)"
+						device usb 2.3 on end
+					end
+					chip drivers/usb/acpi
+						register "desc" = ""USB2 Type-A Port A3""
+						register "type" = "UPC_TYPE_A"
+						register "group" = "ACPI_PLD_GROUP(1, 2)"
+						device usb 2.4 on end
+					end
+					chip drivers/usb/acpi
+						register "desc" = ""USB2 Type-A Port A4""
+						register "type" = "UPC_TYPE_A"
+						register "group" = "ACPI_PLD_GROUP(1, 1)"
+						device usb 2.6 on end
+					end
+					chip drivers/usb/acpi
+						register "desc" = ""USB3 Type-C Port C0""
+						register "type" = "UPC_TYPE_C_USB2_SS_SWITCH"
+						register "group" = "ACPI_PLD_GROUP(2, 1)"
+						device usb 3.0 on end
+					end
+					chip drivers/usb/acpi
+						register "desc" = ""USB3 Type-A Port A4""
+						register "type" = "UPC_TYPE_USB3_A"
+						register "group" = "ACPI_PLD_GROUP(1, 1)"
+						device usb 3.1 on end
+					end
+					chip drivers/usb/acpi
+						register "desc" = ""USB3 Type-A Port A0""
+						register "type" = "UPC_TYPE_USB3_A"
+						register "group" = "ACPI_PLD_GROUP(2, 2)"
+						device usb 3.2 on end
+					end
+					chip drivers/usb/acpi
+						register "desc" = ""USB3 Type-A Port A1""
+						register "type" = "UPC_TYPE_USB3_A"
+						register "group" = "ACPI_PLD_GROUP(2, 3)"
+						device usb 3.3 on end
+					end
+					chip drivers/usb/acpi
+						register "desc" = ""USB3 Type-A Port A3""
+						register "type" = "UPC_TYPE_USB3_A"
+						register "group" = "ACPI_PLD_GROUP(1, 2)"
+						device usb 3.4 on end
+					end
+					chip drivers/usb/acpi
+						register "desc" = ""USB3 Type-A Port A2""
+						register "type" = "UPC_TYPE_USB3_A"
+						register "group" = "ACPI_PLD_GROUP(1, 3)"
+						device usb 3.5 on end
+					end
+				end
+			end
+		end # USB xHCI
+		device pci 15.0 off end # I2C 0
+		device pci 15.1 off end # I2C 1
+		device pci 15.2 off end # I2C 2
+		device pci 15.3 off end # I2C 3
+		device pci 19.0 on
+			chip drivers/i2c/generic
+				register "hid" = ""RTL5682""
+				register "name" = ""RT58""
+				register "desc" = ""Realtek RT5682""
+				register "irq_gpio" = "ACPI_GPIO_IRQ_EDGE_BOTH(GPP_D16)"
+				register "property_count" = "1"
+				register "property_list[0].type" = "ACPI_DP_TYPE_INTEGER"
+				register "property_list[0].name" = ""realtek,jd-src""
+				register "property_list[0].integer" = "1"
+				device i2c 1a on end
+			end
+		end # I2C 4
+		device pci 1c.2 on
+			chip drivers/net
+				register "customized_leds" = "0x05af"
+				register "wake" = "GPE0_DW0_03" # GPP_B3
+				register "stop_gpio" = "ACPI_GPIO_OUTPUT_ACTIVE_LOW(GPP_D4)"
+				register "device_index" = "0"
+				device pci 00.0 on end
+			end
+		end # PCI Express Root Port 3 - RTL8111H LAN
+		device pci 1c.6 on
+			chip drivers/wifi/generic
+				register "wake" = "GPE0_DW2_03"
+				device pci 00.0 on  end
+			end
+		end # PCI Express Root Port 7 - WLAN
+		device pci 1c.7 off end # PCI Express Root Port 8
+		device pci 1f.3 on end # Intel HDA
+	end
+end
diff --git a/src/mainboard/google/dedede/variants/dita/ramstage.c b/src/mainboard/google/dedede/variants/dita/ramstage.c
new file mode 100644
index 0000000000..9bce5e0ce2
--- /dev/null
+++ b/src/mainboard/google/dedede/variants/dita/ramstage.c
@@ -0,0 +1,35 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <baseboard/variants.h>
+
+/*
+ * Psys_pmax considerations
+ *
+ * Given the hardware design in dexi, the serial shunt resistor is 0.01ohm.
+ * The full scale of hardware PSYS signal 1.6v maps to system current 6.009A
+ * instead of real system power. The equation is shown below:
+ * PSYS = 1.6v ~= (0.01ohm x 6.009A) x 50 (INA213, gain 50V/V) x R631/(R631 + R638)
+ * R631/(R631 + R638) = 0.5325 = 36K / (36K + 31.6K)
+ *
+ * The Psys_pmax is a SW setting which tells IMVP9.1 the mapping between system input
+ * current and the actual system power. Since there is no voltage information
+ * from PSYS, different voltage input would map to different Psys_pmax settings:
+ * For Type-C 15V, the Psys_pmax should be 15v x 6.009A = 90.135W
+ * For Type-C 20V, the Psys_pmax should be 20v x 6.009A = 120.18W
+ * For a barrel jack, the Psys_pmax should be 19v x 6.009A = 114.171W
+ *
+ * Imagine that there is a type-c 100W (20V/5A) connected to DUT w/ full loading,
+ * and the Psys_pmax setting is 120W. Then IMVP9.1 can calculate the current system
+ * power = 120W * 5A / 6.009A = 100W, which is the actual system power.
+ */
+const struct psys_config psys_config = {
+	.efficiency = 97,
+	.psys_imax_ma = 6009,
+	.bj_volts_mv = 19000,
+	.bj_power_w = 65,
+};
+
+void variant_devtree_update(void)
+{
+	variant_update_psys_power_limits(&psys_config);
+}
diff --git a/src/mainboard/google/dedede/variants/dita/variant.c b/src/mainboard/google/dedede/variants/dita/variant.c
new file mode 100644
index 0000000000..8be539689e
--- /dev/null
+++ b/src/mainboard/google/dedede/variants/dita/variant.c
@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <sar.h>
+
+const char *get_wifi_sar_cbfs_filename(void)
+{
+	return "wifi_sar-dexi.hex";
+}