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MCP4728 is a 12-bit quad channel DAC with I2C interface. support for: * per-channel gain * per-channel power state * per-channel power down mode control * per-channel vref selection internal/vdd * store current state to on-chip EEPROM Signed-off-by: Andrea Collamati <andrea.collamati@gmail.com> Link: https://lore.kernel.org/r/a0933003ed3c855f9d80d6ce0a40add2b6f0ba36.1691066050.git.andrea.collamati@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>