Which SPI controller driver does the H3 chip use?

I have a NanoPi Neo Core and I'd like to analyse the SPI controller driver and why it toggles the lines the way it does.

In the overlay file, all I see are mentions to 'spidev'.

Where can I find out why the data lines shown below toggle the way they do? I.e. chip select goes low way before the clock line. The MISO line has a droop to GND briefly and the CLK line hangs high for a while before toggling...

Thanks forum :).

YELLOW: CS

PURPLE: MOSI

BLUE: MISO

GREEN: CLK

EDIT: I'm sending two bytes, 0xDA, 0x00 at spi mode 3. Ignore the decoder, it was set to read LSB first.

Edited April 3, 20215 yr by JCOneTwoThree
forgot to add what data is being sent and add more info