linux-kernel - Re: [PATCH v4 0/3] drivers/soc/litex: support 32-bit subregisters, 64-bit CPUs

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Date:   Sun, 27 Dec 2020 07:37:07 +0900
From:   Stafford Horne <shorne@...il.com>
To:     Gabriel Somlo <gsomlo@...il.com>
Cc:     mholenko@...micro.com, kgugala@...micro.com,
        linux-kernel@...r.kernel.org, pczarnecki@...ernships.antmicro.com,
        f.kermarrec@...il.com, gregkh@...uxfoundation.org
Subject: Re: [PATCH v4 0/3] drivers/soc/litex: support 32-bit subregisters,
 64-bit CPUs

On Fri, Dec 25, 2020 at 07:16:46PM -0500, Gabriel Somlo wrote:
> This series expands on commit 22447a99c97e ("drivers/soc/litex: add LiteX
> SoC Controller driver"), adding support for handling both 8- and 32-bit
> LiteX CSR (MMIO) subregisters, on both 32- and 64-bit CPUs.
> 
> Notes v4:
> 	- improved "eloquence" of some 3/3 commit blurb paragraphs
> 	- fixed instance of "disgusting" comment style :)
> 	- litex_[get|set]_reg() now using size_t for 'reg_size' argument
> 	- slightly tighter shift calculation in litex_set_reg()
> 
> Notes v3:
> 	- split into smaller, more self-explanatory patches
> 	- more detailed commit blurb for "main payload" (3/3) patch
> 	- eliminate compiler warning on 32-bit architectures
> 
> Notes v2:
> 	- fix typo (s/u32/u64/) in litex_read64().
> 
> Notes v1:
> 	- LITEX_SUBREG_SIZE now provided by Kconfig.
> 	- it's not LITEX_REG_SIZE, but rather LITEX_SUBREG_ALIGN!
> 	- move litex_[get|set]_reg() to include/linux/litex.h and mark
> 	  them as "static inline";
> 	- redo litex_[read|write][8|16|32|64]() using litex_[get|set]_reg()
> 	  (compiler should produce code as efficient as hardcoded shifts,
> 	   but also automatically matching LITEX_SUBREG_SIZE).
> 
> Gabriel Somlo (3):
>   drivers/soc/litex: move generic accessors to litex.h
>   drivers/soc/litex: separate MMIO from subregister offset calculation
>   drivers/soc/litex: support 32-bit subregisters, 64-bit CPUs

Thanks, this look good to me right now.  I will wait for other reviewers to
chime in over the next week or two after the holidays.

Some minor things:
  - It's customary to add "Changes since xx" on each patch after "---",
    See: https://kernelnewbies.org/PatchTipsAndTricks
  - Did you run your patches through "./scripts/checkpatch.pl"?
  - Did you use "./scripts/get_maintainer.pl" to create the cc list?  I usually
    run:  git send-email --to linux-kernel --cc-cmd ./scripts/get_maintainer.pl ...
    From your cc list it seems you did, but maybe did it manually. (I setup
    .get_maintainer.conf with --no-rolestats for this to work)
  - In general check out:
    https://www.kernel.org/doc/html/latest/process/submit-checklist.html

-Stafford

>  drivers/soc/litex/Kconfig          |  12 +++
>  drivers/soc/litex/litex_soc_ctrl.c |  76 +--------------
>  include/linux/litex.h              | 151 +++++++++++++++++++----------
>  3 files changed, 115 insertions(+), 124 deletions(-)
> 
> -- 
> 2.26.2
>