Fwd: SPI for IMX6x with cyclic DMA for continuous transfer

[Andrea Tessadri <tessadriandrea@xxxxxxxxx>]

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

  Andrea