i2c: mediatek: mt65xx: add optional vbus-supply
Add vbus-supply which provides power to SCL/SDA. Pass this regulator into core so it can be turned on/off for low power mode support. Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org> Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com> Reviewed-by: Qii Wang <qii.wang@mediatek.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
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