On Tue, Nov 29, 2016 at 06:23:38PM +0100, Geert Uytterhoeven wrote: > Hi Rich, > > On Tue, Nov 29, 2016 at 6:09 PM, Rich Felker <dalias@xxxxxxxx> wrote: > > On Fri, Nov 25, 2016 at 08:33:01AM +0100, Simon Horman wrote: > >> Commit edf4100906044225 ("ARM: shmobile: sh7372 dtsi: Remove Legacy file") > >> removed the sh7272 SoC from the kernel in v4.1. > >> > >> This patch removes support for the sh7272 SoC from the sh_flctl driver. > >> As that SoC was the only user of device tree support also remove that > >> from the driver. > >> > >> In essence it reverts commit 7c8f680e96ed ("mtd: sh_flctl: Add device tree > >> support"). This commit may be used as a reference for re-adding device > >> tree support to this driver if a need for it is found in future. > >> > >> This commit has been build-testesd against the ap325rxa_defconfig. > >> I do not have access to the hardware to perform run-time testing > >> on that board which appears to be the only remaining user of this driver. > >> Signed-off-by: Simon Horman <horms+renesas@xxxxxxxxxxxx> > >> --- > >> .../devicetree/bindings/mtd/flctl-nand.txt | 49 --------------- > >> drivers/mtd/nand/sh_flctl.c | 70 +++------------------- > >> 2 files changed, 8 insertions(+), 111 deletions(-) > >> delete mode 100644 Documentation/devicetree/bindings/mtd/flctl-nand.txt > > > > While I'm not the maintainer for this (and I'm not clear that the > > linux-sh list even should have been cc'd; it seems to be shmobile arm > > soc stuff rather than sh arch) I think this is a bad change. If the > > driver is completely unused, it should just be removed, but if there > > Its sole remaining in-kernel user is arch/sh/boards/mach-ap325rxa/setup.c. If indeed there's a user in arch/sh, it makes even more sense not to remove it. arch/sh/boards/* is intended to be removed with only DT support remaining, once drivers have DT support. :-) > > are remaining users that are still using legacy platform device > > bindings, they should gradually be transitioned to device tree, and > > having the device tree support still present makes it easier to do > > that. > > Enjoy converting ap325rxa to DT ;-) Not sure if that's expected to be worse than the rest of it and if it makes sense to convert or just remove. But I don't think changes that put us farther away from DT-only make sense. > > Removing the *bindings* is even worse, as these are a permanent > > interface between hardware/firmware and software. > > While it is a permanent interface, it is only a git revert away... Indeed, but one that requires coordination between subsystem maintainers to get it back in a working state. Rich