Change in coreboot[master]: mb/google/dedede/var/gooey: Configure I2C times for I2C devices

[Stanley Wu (Code Review)]

Stanley Wu has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/57297 )

Change subject: mb/google/dedede/var/gooey: Configure I2C times for I2C devices
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mb/google/dedede/var/gooey: Configure I2C times for I2C devices

Configure I2C high / low time in device tree to ensure I2C
CLK runs under I2C_SPEED_FAST (400 kHz).

Measured I2C frequency just as below after tuning:
Touchpad:	386.7kHz
Touchscreen:	387.4kHz
Audio:		385.7kHz
P-sensor:       378.1kHz

BaUG=b:197247706
BRANCH=dedede
TEST=Build and check I2C clock is under 400kHz

Signed-off-by: stanley.wu 
Change-Id: Ic5d5660181f36f161ae04cbf5003f6d7ad4bc16f
---
M src/mainboard/google/dedede/variants/gooey/overridetree.cb
1 file changed, 8 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/97/57297/1

diff --git a/src/mainboard/google/dedede/variants/gooey/overridetree.cb b/src/mainboard/google/dedede/variants/gooey/overridetree.cb
index 9b291fb..ab0e410 100644
--- a/src/mainboard/google/dedede/variants/gooey/overridetree.cb
+++ b/src/mainboard/google/dedede/variants/gooey/overridetree.cb
@@ -13,18 +13,26 @@
    register "common_soc_config" = "{
    	.i2c[0] = {
    		.speed = I2C_SPEED_FAST,
+			.rise_time_ns = 212,
+			.fall_time_ns = 38,
    	},
    	.i2c[1] = {
    		.speed = I2C_SPEED_FAST,
    	},
    	.i2c[2] = {
    		.speed = I2C_SPEED_FAST,
+			.rise_time_ns = 212,
+			.fall_time_ns = 38,
    	},
    	.i2c[4] = {
    		.speed = I2C_SPEED_FAST,
+			.rise_time_ns = 212,
+			.fall_time_ns = 38,
    	},
    	.i2c[5] = {
    		.speed = I2C_SPEED_FAST,
+			.rise_time_ns = 212,
+			.fall_time_ns = 38,
    	},
    }"