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In addition to GPIO synchronization, The AD7768-1 also supports synchronization over SPI, which use is recommended when the GPIO cannot provide a pulse synchronous with the base MCLK signal. It consists of looping back the SYNC_OUT to the SYNC_IN pin and send a command via SPI to trigger the synchronization. Introduce the 'trigger-sources' property to enable SPI-based synchronization via SYNC_OUT pin, along with additional optional entries for GPIO3 and DRDY pins. Also create #trigger-source-cells property to differentiate the trigger sources provided by the ADC. To improve readability, create a adi,ad7768-1.h header with the macros for the cell values. While at it, add description to the interrupts property. Acked-by: Conor Dooley <conor.dooley@microchip.com> Reviewed-by: David Lechner <dlechner@baylirbe.com> Signed-off-by: Jonathan Santos <Jonathan.Santos@analog.com> Link: https://patch.msgid.link/713fd786010c75858700efaec8bb285274e7057e.1749569957.git.Jonathan.Santos@analog.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>