Hi Igor,
thanks for the support.
I implemented a minimal spi-slave linux driver, it works fine. But there is something that is not clear from the errata and that maybe you can clarify.
I have IMX6QP6AVT1AA-SBAQ1636 (for mask reference).
1) In the errata, and RM datasheet as well, it is said that for slave mode, SS_CTL bit must be set to 0 (no input chip select considered) and to always set BURST_LENGTH.
By the way, if from master side i fully disable CS and just set BURST_LENGTH on imx6q rx side, i can't get any rx interrupt happening. CS must anyway be generated at least as start of transfer, seems.
2) So, from1, if i keep master side toggling CS, it selects and de-select CS for each byte. In this new scenario i cannot in any way use BURST_LENGTH to have an interrupt for multiple bytes, seems the limit is the CS deselecting (going up) so max 1 byte actually.
These 2 points above are someway confusing me, i thought i could read i.e. a burst of 160 bit (20 bytes) without any care on CS. But seems not.
Every clarification is welcome.
Thanks,
Angelo
