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mb/google/dedede/var/kracko: Configure I2C high and low times 

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

Touchpad:	387.7kHz
Touchscreen:	389.4kHz
Audio:		387.6kHz
P-sensor:       372.5kHz

BaUG=b:178092096
BRANCH=dedede
TEST=Build and EE check after tuning I2C clock is under 400kHz

Change-Id: I4f6bdd3802cd94671325a89458cde981a2ffa929
Signed-off-by: Tony Huang <tony-huang@quanta.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55407
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
This commit is contained in:
Tony Huang 2021-05-13 15:06:59 +08:00 committed by Felix Held
parent 5fd0341fcc
commit e4aa07e2bd
1 changed files with 8 additions and 0 deletions
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8
src/mainboard/google/dedede/variants/kracko/overridetree.cb
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@ -35,18 +35,26 @@ chip soc/intel/jasperlake
}, },
.i2c[0] = { .i2c[0] = {
.speed = I2C_SPEED_FAST, .speed = I2C_SPEED_FAST,
.rise_time_ns = 212,
.fall_time_ns = 38,
}, },
.i2c[1] = { .i2c[1] = {
.speed = I2C_SPEED_FAST, .speed = I2C_SPEED_FAST,
}, },
.i2c[2] = { .i2c[2] = {
.speed = I2C_SPEED_FAST, .speed = I2C_SPEED_FAST,
.rise_time_ns = 212,
.fall_time_ns = 38,
}, },
.i2c[4] = { .i2c[4] = {
.speed = I2C_SPEED_FAST, .speed = I2C_SPEED_FAST,
.rise_time_ns = 212,
.fall_time_ns = 38,
}, },
.i2c[5] = { .i2c[5] = {
.speed = I2C_SPEED_FAST, .speed = I2C_SPEED_FAST,
.rise_time_ns = 212,
.fall_time_ns = 38,
}, },
}" }"