[S] Change in coreboot[master]: mb/google/brya/var/omnigul: Adjust I2Cs CLK to be around 400 kHz

[Jamie Chen (Code Review)]

Jamie Chen has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/74393 )

Change subject: mb/google/brya/var/omnigul: Adjust I2Cs CLK to be around 400 kHz
......................................................................

mb/google/brya/var/omnigul: Adjust I2Cs CLK to be around 400 kHz

Need to tune I2C bus 0/1/3/5 clock frequency under the 400kHz for
audio, TPM, touchscreen, and touchpad.

Tuning i2c frequency for omnigul
I2C0 - Audio CLK : 293.7khz
I2C1 - TPM CLK : 388.8khz
I2C3 - Touch Screen CLK : 389.2khz
I2C5 - Touch Pad CLK : 294.8khz

BUG=b:275061994
BRANCH=firmware-brya-14505.B
TEST=emerge-brya coreboot, and measure i2c clock.

Change-Id: I7c4fdf0e003318a69b870b487a60accefbc0ffed
Signed-off-by: Jamie Chen 
---
M src/mainboard/google/brya/variants/omnigul/overridetree.cb
1 file changed, 35 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/93/74393/1

diff --git a/src/mainboard/google/brya/variants/omnigul/overridetree.cb b/src/mainboard/google/brya/variants/omnigul/overridetree.cb
index 6ba5ba0..760ee82 100644
--- a/src/mainboard/google/brya/variants/omnigul/overridetree.cb
+++ b/src/mainboard/google/brya/variants/omnigul/overridetree.cb
@@ -24,16 +24,28 @@
    register "common_soc_config" = "{
    	.i2c[0] = {
    		.speed = I2C_SPEED_FAST,
+			.rise_time_ns = 650,
+			.fall_time_ns = 400,
+			.data_hold_time_ns = 50,
    	},
    	.i2c[1] = {
    		.early_init = 1,
    		.speed = I2C_SPEED_FAST,
+			.rise_time_ns = 600,
+			.fall_time_ns = 400,
+			 .data_hold_time_ns = 50,
    	},
    	.i2c[3] = {
    		.speed = I2C_SPEED_FAST,
+			.rise_time_ns = 600,
+			.fall_time_ns = 400,
+			.data_hold_time_ns = 50,
    	},
    	.i2c[5] = {
    		.speed = I2C_SPEED_FAST,
+			.rise_time_ns = 650,
+			.fall_time_ns = 400,
+			.data_hold_time_ns = 50,
    	},
    }"