mb/google/mancomb: Add initial I2C configuration

BUG=b:182211161
TEST=builds

Signed-off-by: Eric Lai <ericr_lai@compal.corp-partner.google.com>
Change-Id: I483c2e77eedcb434709b67bf9b3fbca636499508
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52174
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Mathew King <mathewk@chromium.org>

src/mainboard/google/mancomb/Kconfig

@@ -10,6 +10,8 @@ config BOARD_SPECIFIC_OPTIONS
 	select AMD_SOC_CONSOLE_UART
 	select BOARD_ROMSIZE_KB_16384
 	select DISABLE_SPI_FLASH_ROM_SHARING
+	select DRIVERS_I2C_GENERIC
+	select DRIVERS_I2C_HID
 	select EC_GOOGLE_CHROMEEC
 	select EC_GOOGLE_CHROMEEC_BOARDID
 	select EC_GOOGLE_CHROMEEC_ESPI

src/mainboard/google/mancomb/variants/baseboard/devicetree.cb

@@ -38,6 +38,9 @@ chip soc/amd/cezanne
 		.vw_irq_polarity = ESPI_VW_IRQ_LEVEL_HIGH(1) | ESPI_VW_IRQ_LEVEL_HIGH(12),
 	}"
 
+	register "i2c_scl_reset" = "GPIO_I2C0_SCL | GPIO_I2C1_SCL |
+					GPIO_I2C2_SCL | GPIO_I2C3_SCL"
+
 	device domain 0 on
 		device ref gpp_bridge_0 on end # WLAN
 		device ref gpp_bridge_1 on end # SD

src/mainboard/google/mancomb/variants/mancomb/overridetree.cb

@@ -1,4 +1,25 @@
 chip soc/amd/cezanne
 	device domain 0 on
 	end # domain
+
+	# I2C Config
+	#+-------------------+---------------------------+
+	#| Field             |  Value                    |
+	#+-------------------+---------------------------+
+	#| I2C0              | memory SPD bus            |
+	#| I2C2              | Codec			 |
+	#| I2C3              | H1/D2 TPM                 |
+	#+-------------------+---------------------------+
+	register "i2c[0]" = "{
+		.speed = I2C_SPEED_FAST,
+		.early_init = true,
+	}"
+	register "i2c[2]" = "{
+		.speed = I2C_SPEED_FAST,
+	}"
+	register "i2c[3]" = "{
+		.speed = I2C_SPEED_FAST,
+		.early_init = true,
+	}"
+
 end # chip soc/amd/cezanne