• Simon Horman's avatar
    spi: sh-msiof: Add R-Car Gen 2 and 3 fallback bindings · 4286db84
    Simon Horman authored
    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: default avatarSimon Horman <horms+renesas@verge.net.au>
    Reviewed-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
    Signed-off-by: default avatarMark Brown <broonie@kernel.org>
    4286db84
spi-sh-msiof.c 34.6 KB