Message-ID: <CAPDyKFoXEgS=zzHbsomgMvEZge3Cw4_avOhDmMSeC+1nv1015w@mail.gmail.com>
Date:   Fri, 21 Jan 2022 15:28:19 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     "Gabriel L. Somlo" <gsomlo@...il.com>
Cc:     linux-kernel@...r.kernel.org, robh+dt@...nel.org,
        devicetree@...r.kernel.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, andy.shevchenko@...il.com, hdanton@...a.com
Subject: Re: [PATCH v14 0/3] mmc: Add LiteSDCard mmc driver

On Fri, 21 Jan 2022 at 14:43, Gabriel L. Somlo <gsomlo@...il.com> wrote:
>
> On Thu, Jan 13, 2022 at 12:02:57PM -0500, Gabriel Somlo wrote:
> > 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 v14:
> > Documentation/devicetree/bindings/mmc/litex,mmc.yaml:
> >   - add missing `vmmc-supply = ...` property to example section
> >
> > >New in v13:
> > >Documentation/devicetree/bindings/mmc/litex,mmc.yaml:
> > >  - add `vmmc-supply` requirement
> > >drivers/mmc/host/Kconfig:
> > >  - add dependency on REGULATOR, REGULATOR_FIXED_VOLTAGE
> > >drivers/mmc/host/litex_mmc.c:
> > >  - use `mmc_regulator_get_supply()`, with fallback to hardcoded 3.3V
>
>
> Ping?

Please don't ping during the merge window, unless it's a fix.

Although, as I have already started to prepare for applying a slew of
patches, I can let you know that this series is going to be applied on
Monday, when rc1 is out.

Kind regards
Uffe

>
>
> > >>New in v12:
> > >>drivers/mmc/host/Kconfig:
> > >>  - add dependency on HAVE_CLK for litex_mmc driver
> > >>  - (re)add "If unsure, say N" to the litex_mmc driver help message
> > >>drivers/mmc/host/litex_mmc.c:
> > >>  - prints message using dev_info() before returning success from probe()
> > >>
> > >>>New in v11:
> > >>>  - picked up r/b from Andy
> > >>>drivers/mmc/host/litex_mmc.c:
> > >>>  - defensive coding of litex_mmc_interrupt() return logic
> > >>>  - remove `dev` member of `struct litex_mmc_host`, only used during probe
> > >>>
> > >>>>New in v10:
> > >>>>drivers/mmc/host/litex_mmc.c:
> > >>>>  - group `linux/mmc/*` includes by themselves
> > >>>>  - clean-up of `return` style (multiple locations throughout source)
> > >>>>  - create `mmc_free_host()` wrapper for use with
> > >>>>    `devm_add_action_or_reset()`
> > >>>>  - use GFP_KERNEL with `dmam_alloc_coherent()`
> > >>>>
> > >>>>>New in v9:
> > >>>>>drivers/mmc/host/Kconfig:
> > >>>>>  - fix OF dependency
> > >>>>>drivers/mmc/host/litex_mmc.c:
> > >>>>>  - remove `linux/of.h` include, no longer needed since dropping
> > >>>>>    `of_match_ptr()`
> > >>>>>  - add `linux/mod_devicetable.h` include
> > >>>>>  - use devm_action_or_reset() to devm-ify mmc_alloc_host(), and obviate
> > >>>>>    the need to call mmc_free_host() explicitly during either probe()
> > >>>>>    error path or during remove()
> > >>>>>
> > >>>>>>New in v8:
> > >>>>>>commit blurbs:
> > >>>>>>  - cosmetic editing of descriptions
> > >>>>>>  - removed `Cc:` lines
> > >>>>>>drivers/mmc/host/litex_mmc.c:
> > >>>>>>  - fix file header comment (for real, this time)
> > >>>>>>  - add explicit `bits.h` include
> > >>>>>>  - remove `of_match_ptr()` wrapper from around .of_match_table argument
> > >>>>>>  - fix devm ordering issues: use `devm_request_irq()`, which precludes
> > >>>>>>    the need to call `free_irq()` on `probe()` error path or from `remove()`
> > >>>>>>
> > >>>>>>>New in v7:
> > >>>>>>>
> > >>>>>>>drivers/mmc/host/Kconfig:
> > >>>>>>>  - added module name in LiteSDCard Kconfig entry
> > >>>>>>>
> > >>>>>>>drivers/mmc/host/litex_mmc.c:
> > >>>>>>>  - fixed comment formatting, ordering, and capitalization throughout
> > >>>>>>>    the entire file
> > >>>>>>>  - sorted header #include statements
> > >>>>>>>  - removed redundant parantheses in readx_poll_timeout() condition
> > >>>>>>>  - explicit handling of readx_poll_timeout() timeout scenarios
> > >>>>>>>  - dev_err() used in litex_mmc_sdcard_wait_done()
> > >>>>>>>  - use memcpy_fromio() to grab command response
> > >>>>>>>  - no need to apply 0xffff mask to a 32-bit value right-shifted by 16
> > >>>>>>>    (host->resp[3])
> > >>>>>>>  - use clamp() instead of min(max(...)...)
> > >>>>>>>  - reworked platform_get_irq_optional() error handling logic
> > >>>>>>>  - no need to explicitly zero host->irq, kzalloc() does that already
> > >>>>>>>  - added missing free_irq() in litex_mmc_probe() error path
> > >>>>>>>  - reordered calls inside litex_mmc_remove() (calling mmc_free_host()
> > >>>>>>>    before free_irq()
> > >>>>>>>
> > >>>>>>>>New in v6:
> > >>>>>>>>
> > >>>>>>>>drivers/mmc/host/litex_mmc.c:
> > >>>>>>>>  - fix handling of deferred probe vs. platform_get_irq_optional()
> > >>>>>>>>  - don't #ifdef dma_set_mask_and_coherent(), since it automatically
> > >>>>>>>>    does the right thing on both 32- and 64-bit DMA capable arches
> > >>>>>>>>  - remove MMC_CAP2_FULL_PWR_CYCLE, add MMC_CAP2_NO_MMC to list of
> > >>>>>>>>    hardcoded capabilities during litex_mmc_probe()
> > >>>>>>>>  - hardcode mmc->ocr_avail to the full 2.7-3.6V range allowed by the
> > >>>>>>>>    SDCard spec (the LiteSDCard device doesn't accept software
> > >>>>>>>>    configuration)
> > >>>>>>>>
> > >>>>>>>>>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    |  78 +++
> >  MAINTAINERS                                   |   9 +-
> >  drivers/mmc/host/Kconfig                      |  13 +
> >  drivers/mmc/host/Makefile                     |   1 +
> >  drivers/mmc/host/litex_mmc.c                  | 661 ++++++++++++++++++
> >  5 files changed, 760 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
> >

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