Initial support for Fairchild's 8 bit I2C gpio expander FXL6408.
The CONFIG_FXL6408_GPIO define enables support for such devices.
Based on: https://patchwork.kernel.org/patch/9148419/
Signed-off-by: Oleksandr Suvorov <cryosay@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
Signed-off-by: Oleksandr Suvorov <oleksandr.suvorov@foundries.io>
