From 4d8a352c5a9541cfce059269388a22216f3c24af Mon Sep 17 00:00:00 2001
From: Jon Murphy <jpmurphy@google.com>
Date: Wed, 29 Mar 2023 18:22:17 -0600
Subject: [PATCH] mb/google/myst: Add initial I2C configuration

Add I2C peripheral reset configuration required during early init.
Enabled I2C generic and HID drivers.

BUG=b:275939564
TEST=builds

Signed-off-by: Jon Murphy <jpmurphy@google.com>
Change-Id: I44668295fb6ed03992df9d9fc075792e181d1a8a
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74108
Reviewed-by: Tim Van Patten <timvp@google.com>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
---
 src/mainboard/google/myst/Kconfig             |  2 +
 .../myst/variants/baseboard/devicetree.cb     | 39 +++++++++++++++++++
 2 files changed, 41 insertions(+)

diff --git a/src/mainboard/google/myst/Kconfig b/src/mainboard/google/myst/Kconfig
index 8405e8ad13..956267f824 100644
--- a/src/mainboard/google/myst/Kconfig
+++ b/src/mainboard/google/myst/Kconfig
@@ -9,6 +9,8 @@ config BOARD_SPECIFIC_OPTIONS
 	def_bool y
 	select AMD_SOC_CONSOLE_UART
 	select BOARD_ROMSIZE_KB_16384
+	select DRIVERS_I2C_GENERIC
+	select DRIVERS_I2C_HID
 	select EC_GOOGLE_CHROMEEC
 	select EC_GOOGLE_CHROMEEC_ESPI
 	select ELOG
diff --git a/src/mainboard/google/myst/variants/baseboard/devicetree.cb b/src/mainboard/google/myst/variants/baseboard/devicetree.cb
index e542817fc0..fbc9e93216 100644
--- a/src/mainboard/google/myst/variants/baseboard/devicetree.cb
+++ b/src/mainboard/google/myst/variants/baseboard/devicetree.cb
@@ -1,5 +1,40 @@
 # SPDX-License-Identifier: GPL-2.0-or-later
 chip soc/amd/phoenix
+	register "i2c_scl_reset" = "GPIO_I2C0_SCL | GPIO_I2C1_SCL |
+					GPIO_I2C2_SCL | GPIO_I2C3_SCL"
+
+	# I2C Pad Control RX Select Configuration
+	register "i2c_pad[0].rx_level" = "I2C_PAD_RX_1_8V" # Trackpad
+	register "i2c_pad[1].rx_level" = "I2C_PAD_RX_1_8V" # Touchscreen
+	register "i2c_pad[2].rx_level" = "I2C_PAD_RX_1_8V" # GSC
+	register "i2c_pad[3].rx_level" = "I2C_PAD_RX_1_8V" # Speaker, Codec, P-SAR, USB
+
+	# I2C Config
+	#+-------------------+----------------------------+
+	#| Field             |  Value                     |
+	#+-------------------+----------------------------+
+	#| I2C0              | Trackpad                   |
+	#| I2C1              | Touchscreen                |
+	#| I2C2              | GSC TPM                    |
+	#| I2C3              | Speaker, Codec, P-SAR, USB |
+	#+-------------------+----------------------------+
+	register "i2c[0]" = "{
+		.speed = I2C_SPEED_FAST,
+	}"
+
+	register "i2c[1]" = "{
+		.speed = I2C_SPEED_FAST,
+	}"
+
+	register "i2c[2]" = "{
+		.speed = I2C_SPEED_FAST,
+		.early_init = true,
+	}"
+
+	register "i2c[3]" = "{
+		.speed = I2C_SPEED_FAST,
+	}"
+
 	device domain 0 on
 		device ref gpp_bridge_a on  # Internal GPP Bridge 0 to Bus A
 			device ref gfx on end # Internal GPU (GFX)
@@ -111,4 +146,8 @@ chip soc/amd/phoenix
 		end
 	end # domain
 	device ref uart_0 on end # UART0
+	device ref i2c_0 on end
+	device ref i2c_1 on end
+	device ref i2c_2 on end
+	device ref i2c_3 on end
 end	# chip soc/amd/phoenix