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MediaTek MT6370 is a SubPMIC consisting of a single cell battery charger with ADC monitoring, RGB LEDs, dual channel flashlight, WLED backlight driver, display bias voltage supply, one general purpose LDO, and the USB Type-C & PD controller complies with the latest USB Type-C and PD standards. Add support for the MediaTek MT6370 backlight driver. It controls 4 channels of 8 series WLEDs in 2048 (only for MT6370/MT6371) / 16384 (only for MT6372) current steps (30 mA) in exponential or linear mapping curves. Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org> Signed-off-by: ChiaEn Wu <chiaen_wu@richtek.com> Signed-off-by: Lee Jones <lee@kernel.org> Link: https://lore.kernel.org/r/20220830034042.9354-11-peterwu.pub@gmail.com