CHROMIUM: arm64: dts: mt8173-oak: increase i2c3 to 400 kHz
The frequency of i2c3 is default 100 kHz (standard mode).
Elan suggests to increase to 400 kHz (fast mode) as there is some
performance concern when operating at 100 kHz.
400 kHz is safe on elm, since the Touchscreen is the only device on i2c3
400 kHz is safe on oak, since the Analogix ANX7814 HDMI/DP bridge is the
only other device on i2c3, and according to its datasheet, it supports
a max i2c speed of 400 kHz.
Signed-off-by: YH Huang <yh.huang@mediatek.com>
BUG=chrome-os-partner:54087
TEST=On elm touchscreen works normally.
TEST=On oak touchscreen works normally.
TEST=On oak Type-C display works normally
Change-Id: I0e3bf25a34c9e65bc510ae039de569bbe29743c5
Reviewed-on: https://chromium-review.googlesource.com/349902
Commit-Ready: Daniel Kurtz <djkurtz@chromium.org>
Tested-by: Bibby Hsieh <bibby.hsieh@mediatek.com>
Tested-by: Daniel Kurtz <djkurtz@chromium.org>
Reviewed-by: Johnny Chuang <johnny.chuang@emc.com.tw>
Reviewed-by: Daniel Kurtz <djkurtz@chromium.org>
Reviewed-by: Nicolas Boichat <drinkcat@chromium.org>
1 file changed
