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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@chromium.org>
Reviewed-on: https://review.coreboot.org/19202
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
This commit is contained in:
Duncan Laurie 2017-04-07 02:03:45 -07:00
parent 5bda642bcb
commit 92dde2fdd7
1 changed files with 5 additions and 5 deletions
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10
src/mainboard/google/eve/devicetree.cb
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@ -163,7 +163,7 @@ chip soc/intel/skylake
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 @@ chip soc/intel/skylake
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