linux-kernel - [PATCH v5 0/3] mmc: Add LiteSDCard mmc driver

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Date:   Wed, 15 Dec 2021 08:07:08 -0500
From:   Gabriel Somlo <gsomlo@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     robh+dt@...nel.org, devicetree@...r.kernel.org,
        ulf.hansson@...aro.org, linux-mmc@...r.kernel.org,
        kgugala@...micro.com, mholenko@...micro.com, krakoczy@...micro.com,
        mdudek@...ernships.antmicro.com, paulus@...abs.org, joel@....id.au,
        shorne@...il.com, geert@...ux-m68k.org,
        david.abdurachmanov@...ive.com, florent@...oy-digital.fr,
        rdunlap@...radead.org
Subject: [PATCH v5 0/3] mmc: Add LiteSDCard mmc driver

Add support for the LiteX SD-Card device, LiteSDCard.

LiteSDCard is a simple SD-Card interface available as part of the LiteX
environment, used with various RISC-V and other FPGA based SoCs.

New in v5:

MAINTAINERS:

  - picked up a/b Mateusz

Doc/dt/bindings/mmc/litex,mmc.yaml:

  - picked up r/b Rob, Joel

drivers/mmc/host/litex_mmc.c:

  - shorten #define constant names (cosmetic, make them less unwieldy)
  - picked up r/b Joel

>New in v4:
>
>Doc/dt/bindings/mmc/litex,mmc.yaml:
>
>  - fixed `dt_binding_check` errors uncovered by Rob's script
>
>drivers/mmc/host/litex_mmc.c:
>
>  - struct litex_mmc_host fields re-ordered so that `pahole` reports
>    no holes in either 32- or 64-bit builds
>  - litex_mmc_set_bus_width() now encapsulates check for
>    host->is_bus_width_set
>  - litex_mmc_request() - factor out dma data setup into separate
>    helper function: litex_mmc_do_dma()
>
>>New in v3:
>>
>>  MAINTAINERS:
>>
>>  - picked up acked-by Joel
>>  - added listing for liteeth driver
>>  - added Joel as additional co-maintainer (thanks!)
>>
>>  Doc/dt/bindings/mmc/litex,mmc.yaml:
>>
>>  - picked up r/b Geert Uytterhoeven <geert@...ux-m68k.org> in DT
>>    bindings document (please let me know if that was premature, and
>>    happy to take further review if needed :)
>>  - add dedicated DT property for source clock frequency
>>
>>  drivers/mmc/host/litex_mmc.c:
>>
>>  - fixed function signature (no line split), and naming (litex_mmc_*)
>>  - more informative MODULE_AUTHOR() entries
>>    - also added matching "Copyright" entries in file header
>>  - fixed description in Kconfig
>>  - fixed DT documentation
>>  - removed magic constants
>>  - removed litex_map_status(), have sdcard_wait_done() return *real*
>>    error codes directly instead.
>>  - streamlined litex_mmc_reponse_len()
>>  - call litex_mmc_set_bus_width() only once, and ensure it returns
>>    correct error code(s)
>>  - use readx_poll_timeout() -- more concise -- instead of
>>    read_poll_timeout()
>>  - use dev_err() in litex_mmc_send_cmd() (instead of pr_err())
>>  - litex_mmc_setclk() will update host->clock before returning
>>  - separate irq initialization into its own function,
>>    litex_mmc_irq_init()
>>  - document rationale for f_min, f_max
>>  - use dmam_alloc_coherent(), which simplifies cleanup significantly
>>  - large `if (data) { ... }` block in litex_mmc_request() left as-is,
>>    there are too many variables shared with the rest of the parent
>>    function body to easily separate (e.g., `len`, `transfer`, `direct`).
>>    If this is indeed a blocker, I can take another shot at refactoring
>>    it in a future revision!
>>  - bump dma_set_mask_and_coherent() to 64-bits on suitable
>>    architectures
>>  - clock source picked up from dedicated DT clock reference property
>>  - remove gpio card-detect logic (needs testing and a dt binding
>>    example before being eligible for upstream inclusion)
>>
>>> New in v2:
>>>   - reword info message in litex_set_clk()
>>>   - streamline code in litex_map_status()
>>>   - fix typos in Kconfig (thanks Randy Dunlap <rdunlap@...radead.org>)
>>>   - improvements suggested by Stafford Horne <shorne@...il.com>
>>>     - allow COMPILE_TEST in Kconfig
>>>     - use read_poll_timeout() when waiting for cmd/data/DMA
>>>       xfer completion
>>>   - include interrupt.h (thanks kernel test robot <lkp@...el.com>)

Gabriel Somlo (3):
  MAINTAINERS: co-maintain LiteX platform
  dt-bindings: mmc: Add bindings for LiteSDCard
  mmc: Add driver for LiteX's LiteSDCard interface

 .../devicetree/bindings/mmc/litex,mmc.yaml    |  72 ++
 MAINTAINERS                                   |   9 +-
 drivers/mmc/host/Kconfig                      |   9 +
 drivers/mmc/host/Makefile                     |   1 +
 drivers/mmc/host/litex_mmc.c                  | 652 ++++++++++++++++++
 5 files changed, 741 insertions(+), 2 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/mmc/litex,mmc.yaml
 create mode 100644 drivers/mmc/host/litex_mmc.c

-- 
2.31.1