spi: sh-msiof: Add R-Car Gen 2 and 3 fallback bindings
In the case of Renesas R-Car hardware we know that there are generations of SoCs, e.g. Gen 2 and Gen 3. But beyond that it's not clear what the relationship between IP blocks might be. For example, I believe that r8a7790 is older than r8a7791 but that doesn't imply that the latter is a descendant of the former or vice versa. We can, however, by examining the documentation and behaviour of the hardware at run-time observe that the current driver implementation appears to be compatible with the IP blocks on SoCs within a given generation. For the above reasons and convenience when enabling new SoCs a per-generation fallback compatibility string scheme is being adopted for drivers for Renesas SoCs. Also: * Deprecate renesas,sh-msiof. It seems poorly named as it is only compatible with SH-Mobile. It also appears unused in mainline. Signed-off-by: NSimon Horman <horms+renesas@verge.net.au> Reviewed-by: NGeert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: NMark Brown <broonie@kernel.org>
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