[coreboot-gerrit] Change in coreboot[master]: mb/google/kohaku: Adjust I2C clock frequency

[shkim (Code Review)]

Hello Seunghwan Kim,

I'd like you to do a code review. Please visit

https://review.coreboot.org/c/coreboot/+/37313

to review the following change.

Change subject: mb/google/kohaku: Adjust I2C clock frequency
......................................................................

mb/google/kohaku: Adjust I2C clock frequency

This change adjusts I2C speed settings to limit frequency to 400KHz.

The new setting values have been from other projects using same I2C
components.

BUG=b:144885961
BRANCH=firmware-hatch-12672.B
TEST=Verified I2C1 and I2C4 frequency not over 400KHz

Change-Id: I9614fb39b6e55cb2ce1b0879a9f5204e55002f8d
Signed-off-by: Seunghwan Kim 
---
M src/mainboard/google/hatch/variants/kohaku/overridetree.cb
1 file changed, 4 insertions(+), 2 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/13/37313/1

diff --git a/src/mainboard/google/hatch/variants/kohaku/overridetree.cb b/src/mainboard/google/hatch/variants/kohaku/overridetree.cb
index 55ac071..d515ecc 100644
--- a/src/mainboard/google/hatch/variants/kohaku/overridetree.cb
+++ b/src/mainboard/google/hatch/variants/kohaku/overridetree.cb
@@ -60,6 +60,8 @@
    	},
    	.i2c[1] = {
    		.speed = I2C_SPEED_FAST,
+			.rise_time_ns = 60,
+			.fall_time_ns = 25,
    	},
    	.i2c[2] = {
    		.speed = I2C_SPEED_FAST,
@@ -68,8 +70,8 @@
    	},
    	.i2c[4] = {
    		.speed = I2C_SPEED_FAST,
-			.rise_time_ns = 100,
-			.fall_time_ns = 20,
+			.rise_time_ns = 104,
+			.fall_time_ns = 52,
    	},
    	.gspi[0] = {
    	       .speed_mhz = 1,