Official Omega2 Hardware SPI driver for C?

[nsmith]

Hello,

I need to use the HARDWARE SPI in the OMEGA2+ to constantly read A/D data at a very high sample rate from this 8-bit A/D converter chip (the SPI timing diagram for the chip is in this document):

https://www.ti.com/lit/ds/symlink/ads7866.pdf?HQS=dis-dk-null-digikeymode-dsf-pf-null-wwe&ts=1668659017378&ref_url=https%3A%2F%2Fwww.ti.com%2Fgeneral%2Fdocs%2Fsuppproductinfo.tsp%3FdistId%3D10%26gotoUrl%3Dhttps%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Fads7866

Before i start writing code I just wanted to find out which is the "official" "C" language driver for the HARDWARE SPI in OMEGA2+

I found 2 sources, does anyone know which of these "C" drivers below is the best one, or maybe there is a better one that you know of?

Group 1:
https://www.kernel.org/doc/Documentation/spi/spidev
https://linux-sunxi.org/SPIdev#In_the_user_space

Group 2:
https://github.com/torvalds/linux/blob/master/drivers/spi/spi-mt7621.c

[Lazar Demin]

@nsmith You'll want to use the SPIdev interface for your userspace programs.
I believe spi-mt7621 is the hardware specific kernel layer and can't be directly accessed from userspace.

EDIT: forgot to mention, spidev definitely works. It's used under the hood in our python-spidev implementation

[DumTux]

In my opinion, it is spidev (package name, kmod-spidev), as it is the working module on OpenWrt 22.03 build for Omega2.
I could see hardware SPI driver is present under /dev/spi* after installing it.
Havent tested it yet by myself, though.

[nsmith]

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