mb/google/rex/var/rex0: Configure I2C5 timing
Configure I2C5 timing in devicetree to ensure I2C devices
meet timing requirement.
BUG=b:300177424
TEST=Build and check I2C devices timing meet spec.
| | I2C5-Before | I2C5-After |
|-------------|-------------|------------|
| FSMB(KHz) | 445.400 | 343.638 |
| TLOW(us) | 1.543 | 2.068 |
| THIGH(us) | 0.475 | 0.604 |
| THD:STA(us) | 0.603 | 0.711 |
| TSU:STA(us) | 0.612 | 0.611 |
| TSU:STO(us) | 0.605 | 0.611 |
| TBUF(us) | >1.914 | >2.044 |
Change-Id: I3bb678b66d55c6bfaff76e3e5500a2a3bc3a2c61
Signed-off-by: Ivy Jian <ivy.jian@quanta.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/78111
Reviewed-by: Subrata Banik <subratabanik@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/mainboard/google/rex/variants/rex0/overridetree.cb b/src/mainboard/google/rex/variants/rex0/overridetree.cb
index d92dc24..1d4ba63 100644
--- a/src/mainboard/google/rex/variants/rex0/overridetree.cb
+++ b/src/mainboard/google/rex/variants/rex0/overridetree.cb
@@ -142,8 +142,8 @@
},
.i2c[5] = {
.speed = I2C_SPEED_FAST,
- .rise_time_ns = 900,
- .fall_time_ns = 400,
+ .rise_time_ns = 400,
+ .fall_time_ns = 280,
.data_hold_time_ns = 50,
},
}"