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Re: [patches] Re: [PATCH 2/7] RISC-V: arch/riscv Makefile and Kconfigs

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On Mon, 2017-05-22 at 22:16 -0700, Olof Johansson wrote:
> The same is true for some other drivers. Actually, I wonder if it
> might be just as easy to implement a sbi backend for hvc -- see
> hvc_udbg.c for an example where, on power, you have a simple get/put
> char hypervisor call in a very similar manner.

Rather look at hvc_opal. This is the console driver we use on native
POWER servers with the OPAL firmware, and it calls into a firmware
in a very similar way.

The driver lives in drivers/tty/hvc. It does call some "helpers" in
the arch code that wrap the actual FW calls.

> Either way (keeping discrete sbi driver or implementing hvc backend),
> moving to drivers/tty is the right thing here -- we've worked hard on
> ARM to get rid of random drivers under arch/ and it'd be nice to not
> see new ones intoduced here.

Yup. The reason mostly is that if the tty maintainer needs to do a
subsystem-wide change, he can address all drivers in drivers/tty and
doesn't have to look for others elsewhere in the tree. This is the same
for all subsystems.

Cheers,
Ben.

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RISC-V Linux Port v1 Palmer Dabbelt <palmer@dabbelt.com> - 2017-05-23 02:50 +0200
  [PATCH 5/7] RISC-V: arch/riscv/lib Palmer Dabbelt <palmer@dabbelt.com> - 2017-05-23 02:50 +0200
    Re: [PATCH 5/7] RISC-V: arch/riscv/lib Geert Uytterhoeven <geert@linux-m68k.org> - 2017-05-23 12:50 +0200
      Re: [PATCH 5/7] RISC-V: arch/riscv/lib Palmer Dabbelt <palmer@dabbelt.com> - 2017-05-24 00:10 +0200
    Re: [PATCH 5/7] RISC-V: arch/riscv/lib Arnd Bergmann <arnd@arndb.de> - 2017-05-23 13:30 +0200
  [PATCH 2/7] RISC-V: arch/riscv Makefile and Kconfigs Palmer Dabbelt <palmer@dabbelt.com> - 2017-05-23 02:50 +0200
    Re: [PATCH 2/7] RISC-V: arch/riscv Makefile and Kconfigs Olof Johansson <olof@lixom.net> - 2017-05-23 03:30 +0200
      Re: [PATCH 2/7] RISC-V: arch/riscv Makefile and Kconfigs Randy Dunlap <rdunlap@infradead.org> - 2017-05-23 03:40 +0200
        Re: [PATCH 2/7] RISC-V: arch/riscv Makefile and Kconfigs Palmer Dabbelt <palmer@dabbelt.com> - 2017-05-23 06:50 +0200
      Re: [PATCH 2/7] RISC-V: arch/riscv Makefile and Kconfigs Palmer Dabbelt <palmer@dabbelt.com> - 2017-05-23 06:50 +0200
        Re: [patches] Re: [PATCH 2/7] RISC-V: arch/riscv Makefile and Kconfigs Olof Johansson <olof@lixom.net> - 2017-05-23 07:20 +0200
          Re: [patches] Re: [PATCH 2/7] RISC-V: arch/riscv Makefile and  Kconfigs Benjamin Herrenschmidt <benh@kernel.crashing.org> - 2017-05-23 23:10 +0200
    Re: [PATCH 2/7] RISC-V: arch/riscv Makefile and Kconfigs Olof Johansson <olof@lixom.net> - 2017-05-23 07:30 +0200
      Re: [PATCH 2/7] RISC-V: arch/riscv Makefile and Kconfigs Palmer Dabbelt <palmer@dabbelt.com> - 2017-05-23 17:30 +0200
    Re: [PATCH 2/7] RISC-V: arch/riscv Makefile and Kconfigs Geert Uytterhoeven <geert@linux-m68k.org> - 2017-05-23 13:00 +0200
    Re: [PATCH 2/7] RISC-V: arch/riscv Makefile and Kconfigs Arnd Bergmann <arnd@arndb.de> - 2017-05-23 13:50 +0200
  [PATCH 3/7] RISC-V: Device Tree Documentation Palmer Dabbelt <palmer@dabbelt.com> - 2017-05-23 02:50 +0200
    Re: [PATCH 3/7] RISC-V: Device Tree Documentation Arnd Bergmann <arnd@arndb.de> - 2017-05-23 14:10 +0200
  Re: RISC-V Linux Port v1 Olof Johansson <olof@lixom.net> - 2017-05-23 03:20 +0200
    Re: RISC-V Linux Port v1 Randy Dunlap <rdunlap@infradead.org> - 2017-05-23 03:30 +0200
      Re: RISC-V Linux Port v1 Palmer Dabbelt <palmer@dabbelt.com> - 2017-05-23 05:40 +0200
    Re: RISC-V Linux Port v1 Palmer Dabbelt <palmer@dabbelt.com> - 2017-05-23 05:40 +0200
      Re: RISC-V Linux Port v1 Tobias Klauser <tklauser@distanz.ch> - 2017-05-23 08:50 +0200
        Re: RISC-V Linux Port v1 Palmer Dabbelt <palmer@dabbelt.com> - 2017-05-23 17:50 +0200
  Re: RISC-V Linux Port v1 Randy Dunlap <rdunlap@infradead.org> - 2017-05-23 04:20 +0200
    Re: RISC-V Linux Port v1 Palmer Dabbelt <palmer@dabbelt.com> - 2017-05-23 06:50 +0200
  Re: [PATCH 6/7] RISC-V: arch/riscv/kernel Olof Johansson <olof@lixom.net> - 2017-05-23 04:20 +0200
  Re: [PATCH 4/7] RISC-V: arch/riscv/include Arnd Bergmann <arnd@arndb.de> - 2017-05-23 15:00 +0200
    Re: [PATCH 4/7] RISC-V: arch/riscv/include Benjamin Herrenschmidt <benh@kernel.crashing.org> - 2017-05-23 23:30 +0200
  Re: [PATCH 6/7] RISC-V: arch/riscv/kernel Arnd Bergmann <arnd@arndb.de> - 2017-05-23 15:40 +0200

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