linux-kernel - Re: [PATCH v2 0/3] Add MIPS CDMM bus support

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Date:	Wed, 25 Feb 2015 11:02:38 +0000
From:	James Hogan <james.hogan@...tec.com>
To:	<linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	Ralf Baechle <ralf@...ux-mips.org>, <linux-mips@...ux-mips.org>
Subject: Re: [PATCH v2 0/3] Add MIPS CDMM bus support

Hi,

On 02/02/15 11:45, James Hogan wrote:
> This patchset adds basic support for the MIPS Common Device Memory Map
> Memory (CDMM) region in the form of a bus in the standard Linux device
> model.

It'd be great to get these patches upstream for v4.1 via the MIPS tree
along with my other two related patchsets (MIPS: Allow shared IRQ for
timer & perf counter, and Add MIPS EJTAG Fast Debug Channel TTY driver).

Greg: Since this is a new bus I suspect I need your Ack/Review first?

Btw, more info about CDMM can be found here:
http://www.linux-mips.org/wiki/CDMM

And a git branch containing the latest version of all 3 patchsets
(basically just rebased on v4.0-rc1 to resolve conflicts) can be found
here:
git://git.kernel.org/pub/scm/linux/kernel/git/jhogan/mips.git fdc

Thanks
James

> 
> Since the CDMM region is a feature of the MIPS architecture (since
> around MIPSr2) the first patch adds the necessary definitions and
> probing to arch/mips.
> 
> The second patch adds the actual bus driver (see that patch for lots
> more info). 
> 
> The final patch just enables CDMM to work on Malta.
> 
> Futher patches will follow soon to add TTY/Console/KGDB support for the
> EJTAG Fast Debug Channel (FDC) device which is found in the CDMM region.
> 
> Changes in v2:
> - Fix typo in definition of MIPS_CPU_CDMM, s/0ll/ull (Maciej).
> - Fix some checkpatch errors.
> - Correct CDMM name in various places. It is "Common Device Memory Map",
>   rather than "Common Device Mapped Memory" (which for some reason had
>   got stuck in my head).
> 
> Cc: Ralf Baechle <ralf@...ux-mips.org>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: linux-mips@...ux-mips.org
> 
> James Hogan (3):
>   MIPS: Add arch CDMM definitions and probing
>   MIPS: Add CDMM bus support
>   MIPS: Malta: Implement mips_cdmm_phys_base()
> 
>  arch/mips/include/asm/cdmm.h         |  87 +++++
>  arch/mips/include/asm/cpu-features.h |   4 +
>  arch/mips/include/asm/cpu.h          |   1 +
>  arch/mips/include/asm/mipsregs.h     |  11 +
>  arch/mips/kernel/cpu-probe.c         |   2 +
>  arch/mips/mti-malta/malta-memory.c   |   7 +
>  drivers/bus/Kconfig                  |  13 +
>  drivers/bus/Makefile                 |   1 +
>  drivers/bus/mips_cdmm.c              | 711 +++++++++++++++++++++++++++++++++++
>  include/linux/mod_devicetable.h      |   8 +
>  scripts/mod/devicetable-offsets.c    |   3 +
>  scripts/mod/file2alias.c             |  16 +
>  12 files changed, 864 insertions(+)
>  create mode 100644 arch/mips/include/asm/cdmm.h
>  create mode 100644 drivers/bus/mips_cdmm.c
> 


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