Quad and Dual format support for Synopsys Enhanced SPI controllers

[charkster]

I have a new Raspberry Pi 5 board and their documentation says that SPI0 can be quad format. The RPi5 SPI master is a Synopsys SSI, which has "enhanced" features such as Quad and Dual width. I have seen the Linux kernel changes for this particular controller and was wondering if you had plans to support it in py-spidev? Single width is default for SPI0 and it works just fine with py-spidev.
Thanks.

https://github.com/torvalds/linux/blob/master/tools/spi/spidev_test.c

[fschrempf]

#141 does the first step in this direction by supporting 32-bit mode flags. After this has been merged, support for the dual, quad and octal flags could be added.