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authorWisley Chen <wisley.chen@quantatw.com>2016-11-27 16:56:30 +0800
committerMartin Roth <martinroth@google.com>2016-11-30 16:53:02 +0100
commit1612cef81f20cb955d591f3cebcf864d784856ac (patch)
tree7cd5c7153f568f4ed0f67d18dfc85097d4bae189 /Documentation/gcov.txt
parent96e9ff168ca52f3bb06606b65fb07ba5e4e7bb50 (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)
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