Messages in this thread | | | Date | Fri, 8 Jan 2016 21:35:11 +0100 | Subject | Re: [PATCH 2/2] MAINTAINERS: remove linux-sh list from non-arch/sh sections | From | Geert Uytterhoeven <> |
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Hi Rich,
On Fri, Jan 8, 2016 at 7:21 PM, Rich Felker <dalias@libc.org> wrote: > On Fri, Jan 08, 2016 at 10:01:25AM +0100, Geert Uytterhoeven wrote: >> Many old ARM/SH-Mobile SoCs look like SH SoCs with an ARM CPU core bolted on. >> Recent Renesas ARM SoCs still share many IP cores with older SH SoCs; most of >> them even have a secondary SH4 CPU core. Using the SH4 CPU core could be useful >> for doing SH4 work, until J4 becomes mainstream (cfr. old prototype in >> http://www.spinics.net/lists/linux-sh/msg07188.html). >> Probably the Jx series won't share IP cores with SH/ARM, but as arch/sh/ >> maintainers you have to care about older Renesas SH platforms, too. >> >> For patchwork, that would mean some more delegation needs to be put in place. >> >> So far my 0.05€... > > Is that actually the case? I can't find any current support in the > kernel for running on these SH4 cores, and I was under the impression > that they were being phased out, if not already gone. And the bulk of
There's no in-kernel support for these SH4 cores yet, just the prototype.
> the driver-related discussion I've seen on linux-sh over the past year > does not seem to be related to hardware that's present/usable on > boards where you can run Linux/SH. If this is incorrect, I'd like to > hear some views on how/why such hardware is relevant to arch/sh.
At least the following drivers are shared between ARM and SH:
hspi rspi sh-cmt sh_fsi sh-mtu2 sh-sci (covering sci, scif, scifa, scifb, hscif) sh-tmu tpu
and of course the sh-pfc pinctrl subsystem.
Probably I'm forgetting a few that haven't been converted to DT on ARM yet, and where the ARM side thus could benefit from a DT conversion on SH.
Note that you can find "shmobile" SoCs under both arch/sh/ (sh7723/sh7724/sh7343/sh7722/sh7366) and arch/arm/mach-shmobile/. Some of these used to share even more code (e.g. drivers/sh/clk/), until the ARM ones were converted to the Common Clock Framework.
Gr{oetje,eeting}s,
Geert
-- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
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