diff options
| author | Wisley Chen <wisley.chen@quantatw.com> | 2016-11-27 16:56:30 +0800 |
|---|---|---|
| committer | Martin Roth <martinroth@google.com> | 2016-11-30 16:53:02 +0100 |
| commit | 1612cef81f20cb955d591f3cebcf864d784856ac (patch) | |
| tree | 7cd5c7153f568f4ed0f67d18dfc85097d4bae189 /Makefile | |
| parent | 96e9ff168ca52f3bb06606b65fb07ba5e4e7bb50 (diff) | |
mainboard/google/snappy: Tune i2c frequency to 400 Khz
tune i2c devices clk for snappy:
I2C0: audio
I2C2: TPM H1
I2C3: elan touchscreen
I2C4: elan touchpad
I2C5: wacom digitizer
BUG=chrome-os-partner:59034
BRANCH=master
TEST=emerge-snappy coreboot chromeos-bootimage, and measured on EVT.
audio:
Freq. 393.7kHz
Rise Time 58.8ns
Fall time 12.11ns
TPM H1:
Freq. 398.8kHz
Rise Time 31.71ns
Fall time 13.28ns
elan touchscreen:
Freq. 390.5kHz
Rise Time 235.7ns
Fall time 37.64ns
elan touchpad:
Freq. 393.7kHz
Rise Time 288.8ns
Fall time 51.67ns
wacom digitizer:
Freq. 388.8kHz
Rise Time 124.1ns
Fall time 21.10ns
Change-Id: Ib2be9e1575d4962476423eafa80f9bb10ba40e17
Signed-off-by: Wisley Chen <wisley.chen@quantatw.com>
Reviewed-on: https://review.coreboot.org/17634
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins)
Diffstat (limited to 'Makefile')
0 files changed, 0 insertions, 0 deletions