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>
diff --git a/src/mainboard/google/dedede/variants/kracko/overridetree.cb b/src/mainboard/google/dedede/variants/kracko/overridetree.cb
index 3d9307b..dec4c0a 100644
--- a/src/mainboard/google/dedede/variants/kracko/overridetree.cb
+++ b/src/mainboard/google/dedede/variants/kracko/overridetree.cb
@@ -35,18 +35,26 @@
},
.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,
},
}"