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

2020-12-26 Thread Stafford Horne
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
> 


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

2020-12-25 Thread Gabriel Somlo
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

 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