dt-bindings: spi: sunxi: Document new compatible strings

The Allwinner H6 SPI controller has advanced features over the H3
version, but remains compatible with it.
Document the usual "specific", "fallback" compatible string pair.
Also add the R40 version while at it.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
This commit is contained in:
Andre Przywara 2020-01-16 23:11:48 +00:00 • committed by Maxime Ripard
commit e2c9e67e44
No known key found for this signature in database
GPG key ID: E3EF0D6F671851C5