Hi!

This patch series adds SPI driver for the Renesas RPC-IF.
Alongside relevant changes for spi-mem have been also backported.
This enables accessing SPI flash chip connected to RPC-IF.

The series includes just the driver changes as the DTS/i changes are
currently being upstreamed [1]. The driver has been tested on RZ/G2{EM}
with all the required dts/i changes [2].

All the patches have been cherry picked from Linux 5.11-rc2.

Thanks, series looks good. I commented on the individual patches, but
all but one are cleanup suggestions, not bugs spotted.

Tests do not show anything bad:

https://gitlab.com/cip-project/cip-kernel/linux-cip/-/pipelines/237669839

(but we don't have the driver enabled in our configs..)

I believe this can go in. I can apply it if there are no other
comments.

Best regards,
								Pavel

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