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mb/google/dedede/var/bugzzy: Adjust I2C speed 

This change adjusts all I2C speed to lower then 400KHz. The rise_time_ns
and fall_time_ns values for each port are capured by a scope.

BUG=None
BRANCH=dedede
TEST=built and verified adjusted I2C speed < 400KHz

Signed-off-by: Seunghwan Kim <sh_.kim@samsung.corp-partner.google.com>
Change-Id: I9504608dd8d9a5f5a3848ef34691557942c21023
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58965
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
This commit is contained in:
Seunghwan Kim 2021-11-05 09:58:51 +09:00 committed by Felix Held
parent e9654a857f
commit 8fbfc080fc
1 changed files with 6 additions and 0 deletions
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6
src/mainboard/google/dedede/variants/bugzzy/overridetree.cb
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@ -63,12 +63,18 @@ chip soc/intel/jasperlake
}, },
.i2c[1] = { .i2c[1] = {
.speed = I2C_SPEED_FAST, .speed = I2C_SPEED_FAST,
.rise_time_ns = 133,
.fall_time_ns = 29,
}, },
.i2c[2] = { .i2c[2] = {
.speed = I2C_SPEED_FAST, .speed = I2C_SPEED_FAST,
.rise_time_ns = 227,
.fall_time_ns = 9,
}, },
.i2c[3] = { .i2c[3] = {
.speed = I2C_SPEED_FAST, .speed = I2C_SPEED_FAST,
.rise_time_ns = 91,
.fall_time_ns = 2,
}, },
.i2c[4] = { .i2c[4] = {
.speed = I2C_SPEED_FAST, .speed = I2C_SPEED_FAST,