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The Allwinner V3s SoC have the same SPI0 pinmux configuration, SPI clock
configuration and SPI controller (base address and the controller) with
H3.

Add spiflash support for it.
Signed-off-by: Icenowy Zheng <icenowy@aosc.io>

A20 (as does A10) uses pins 0,1,2 and 23 in bank C
for SPI 0.
Signed-off-by: Priit Laes <priit.laes@paf.com>

Signed-off-by: Priit Laes <priit.laes@paf.com>

Add the JEDEC manufacturer ID for Macronix to the list of recognized
vendors, also add the MX25L series to the list of supported chips.
Those chips are used on the OrangePi PC 2 boards, for instance.
Tag the struct definition with the member names on the way to improve
readability of the SPI flash chip description.
Signed-off-by: Andre Przywara <osp@andrep.de>

Using the new AAPCS function remote execution support, add support to
read from and write to SPI flash connected to a device.
This allows flashing boot code to a device.
Signed-off-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>
[Andre: adjust to upstream changes]
Signed-off-by: Andre Przywara <osp@andrep.de>