[coreboot-gerrit] Change in coreboot[master]: google/eve: Update I2C bus timing
Duncan Laurie (Code Review)
gerrit at coreboot.org
Mon Apr 10 10:07:37 CEST 2017
Duncan Laurie has submitted this change and it was merged. ( https://review.coreboot.org/19202 )
Change subject: google/eve: Update I2C bus timing
......................................................................
google/eve: Update I2C bus timing
Update the I2C rise/fall timings based on newly measured values
on a new board with updated pull-up resistor values.
Touchscreen: rise time 98ns, fall time 38ms
Touchpad: rise time 111ns, fall time 41ns
TPM: rise time 112ns, fall time 34ns
BUG=b:35583133
BRANCH=none
TEST=Each I2C bus frequency was verified on a scope to be ~400MHz
Change-Id: Ibb3a15fa0cc862f36c1b9c63ac7847221020c4c0
Signed-off-by: Duncan Laurie <dlaurie at chromium.org>
Reviewed-on: https://review.coreboot.org/19202
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter at users.sourceforge.net>
Reviewed-by: Aaron Durbin <adurbin at chromium.org>
Reviewed-by: Furquan Shaikh <furquan at google.com>
---
M src/mainboard/google/eve/devicetree.cb
1 file changed, 5 insertions(+), 5 deletions(-)
Approvals:
Aaron Durbin: Looks good to me, approved
Paul Menzel: Looks good to me, but someone else must approve
build bot (Jenkins): Verified
Furquan Shaikh: Looks good to me, approved
diff --git a/src/mainboard/google/eve/devicetree.cb b/src/mainboard/google/eve/devicetree.cb
index d8f6362..427ba6b 100644
--- a/src/mainboard/google/eve/devicetree.cb
+++ b/src/mainboard/google/eve/devicetree.cb
@@ -163,7 +163,7 @@
register "i2c_voltage[0]" = "I2C_VOLTAGE_3V3"
register "i2c[0]" = "{
.speed = I2C_SPEED_FAST_PLUS,
- .rise_time_ns = 17,
+ .rise_time_ns = 98,
.fall_time_ns = 38,
}"
@@ -172,16 +172,16 @@
register "i2c[1]" = "{
.early_init = 1,
.speed = I2C_SPEED_FAST,
- .rise_time_ns = 88,
- .fall_time_ns = 32,
+ .rise_time_ns = 112,
+ .fall_time_ns = 34,
}"
# Touchpad
register "i2c_voltage[2]" = "I2C_VOLTAGE_1V8"
register "i2c[2]" = "{
.speed = I2C_SPEED_FAST,
- .rise_time_ns = 247,
- .fall_time_ns = 17,
+ .rise_time_ns = 111,
+ .fall_time_ns = 41,
}"
# Audio
--
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Gerrit-MessageType: merged
Gerrit-Change-Id: Ibb3a15fa0cc862f36c1b9c63ac7847221020c4c0
Gerrit-PatchSet: 2
Gerrit-Project: coreboot
Gerrit-Branch: master
Gerrit-Owner: Duncan Laurie <dlaurie at chromium.org>
Gerrit-Reviewer: Aaron Durbin <adurbin at chromium.org>
Gerrit-Reviewer: Duncan Laurie <dlaurie at chromium.org>
Gerrit-Reviewer: Furquan Shaikh <furquan at google.com>
Gerrit-Reviewer: Paul Menzel <paulepanter at users.sourceforge.net>
Gerrit-Reviewer: build bot (Jenkins)
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