]> git.karo-electronics.de Git - linux-beck.git/commit
spi: sh-msiof: Add R-Car Gen 2 and 3 fallback bindings
authorSimon Horman <horms+renesas@verge.net.au>
Mon, 12 Dec 2016 09:49:35 +0000 (10:49 +0100)
committerMark Brown <broonie@kernel.org>
Wed, 14 Dec 2016 17:38:18 +0000 (17:38 +0000)
commit4286db8456f4fa0c6af2b6b9abc5991a7e7da69c
treecd75a7ae69486439143d1811515c5d1cdebf02c5
parentfafd67940774733fa97f4b09412aea6981b82e0a
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: Simon Horman <horms+renesas@verge.net.au>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Mark Brown <broonie@kernel.org>
Documentation/devicetree/bindings/spi/sh-msiof.txt
drivers/spi/spi-sh-msiof.c