[PATCH 4/4] spi: sun6i: add support for R329 SPI controllers

[Samuel Holland]

On 4/22/22 10:56 AM, icenowy at outlook.com wrote:
> From: Icenowy Zheng <icenowy at aosc.io>
> 
> R329 has two SPI controllers. One of it is quite similar to previous
> ones, but with internal clock divider removed; the other added MIPI DBI
> Type-C offload based on the first one.
> 
> Add basical support for these controllers. As we're not going to
> support the DBI functionality now, just implement the two kinds of
> controllers as the same.

I'm curious what speeds you were able to use SPI at. On D1, with effectively
these same changes, I would always get corrupted data when reading from the
onboard SPI NAND on the Nezha board. However, if I enabled the "new mode of
sample timing" (bit 2 in GBL_CTL_REG), I got the correct data.

Regards,
Samuel