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The ad7591 has reset, clr and ldac gpios. For the DAC to output data continuously written to the data register the state of these gpios needs to be set by the driver. Add these gpios to the driver making them optional in case they are fixed on the pcb. Reviewed-by: David Lechner <dlechner@baylibre.com> Signed-off-by: Axel Haslam <ahaslam@baylibre.com> Link: https://patch.msgid.link/20241031071746.848694-5-ahaslam@baylibre.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>