SPI for IMX6x with cyclic DMA

Andrea Tessadri <tessadriandrea@...>

I've just developed and tested cyclic DMA transfer for a SPI device on a IMX6UL with kernel 4.9.88
I wanted to have a single SPI transfer repeated continuously in order to feed a DAC for generation of a particular waveform for a medical device, without interruption and minimal jitter (this is why I though to make the change at low level, instead of making the protocol driver to pump several identical messages to SPI subsystem)
I am wondering if this feature could be interesting for other applications and if it is worth to submit a patch for drivers/spi/spi-imx.c
Thank you in advance


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