[PATCH v6 00/35] Improvements for Tegra I2C driver

[Dmitry Osipenko <digetx@gmail.com>]

Hello!

This series performs refactoring of the Tegra I2C driver code and hardens
the atomic-transfer mode.

Changelog:

v6: - Added new patch that adds missing RPM puts, thanks to Andy Shevchenko
      for the suggestion.

    - Improved commit messages by extending them with more a more detailed
      explanation of the changes.

    - Added clarifying comment to the "Use reset_control_reset()" change,
      which was asked by Andy Shevchenko.

    - Refactored the "Clean up probe function" patch by moving the
      dev_err_probe() change into the "Use clk-bulk helpers" patch,
      which was suggested by Andy Shevchenko.

    - Improved ordering of the patches like it was suggested by
      Andy Shevchenko.

    - Added Andy Shevchenko to suggested-by of the "Use clk-bulk helpers"
      patch.

    - Improved "Remove i2c_dev.clk_divisor_non_hs_mode member" patch by
      making the case-switch to use "fast plus mode" timing if clock rate
      is out-of-range. Just to make it more consistent.

    - The "Improve tegra_i2c_dev structure" patch is squashed into
     "Improve formatting of variables" and "Clean up types/names" patches.

    - All variable-renaming changes are squashed into a single "Clean up
      variable names" patch.

    - Made extra minor improvement to various patches, like more comments
      and indentations improved.

v5: - Dropped the "Factor out runtime PM and hardware initialization"
      patch, like it was suggested by Michał Mirosław. Instead a less
      invasive "Factor out hardware initialization into separate function"
      patch added, it doesn't touch the RPM initialization.

    - The "Remove outdated barrier()" patch now removes outdated comments.

    - Updated commit description of the "Remove "dma" variable" patch,
      saying that the transfer mode may be changed by a callee. This was
      suggested by Michał Mirosław.

    - Reworked the "Clean up and improve comments" patch. Couple more
      comments are corrected and reworded now.

    - Added r-b's from Michał Mirosław.

    - New patches:

        i2c: tegra: Mask interrupt in tegra_i2c_issue_bus_clear()
        i2c: tegra: Remove redundant check in tegra_i2c_issue_bus_clear()
        i2c: tegra: Don't fall back to PIO mode if DMA configuration fails
        i2c: tegra: Clean up variable types
        i2c: tegra: Improve tegra_i2c_dev structure

v4: - Reordered patches in the fixes/features/cleanups order like it was
      suggested by Andy Shevchenko.

    - Now using clk-bulk API, which was suggested by Andy Shevchenko.

    - Reworked "Make tegra_i2c_flush_fifos() usable in atomic transfer"
      patch to use iopoll API, which was suggested by Andy Shevchenko.

    - Separated "Clean up probe function" into several smaller patches.

    - Squashed "Add missing newline before returns" patch into
      "Clean up whitespaces, newlines and indentation".

    - The "Drop '_timeout' from wait/poll function names" is renamed to
      "Rename wait/poll functions".

    - The "Use reset_control_reset()" is changed to not fail tegra_i2c_init(),
      but only emit warning. This should be more friendly behaviour in oppose
      to having a non-bootable machine if reset-control fails.

    - New patches:

        i2c: tegra: Remove error message used for devm_request_irq() failure
        i2c: tegra: Use devm_platform_get_and_ioremap_resource()
        i2c: tegra: Use platform_get_irq()
        i2c: tegra: Use clk-bulk helpers
        i2c: tegra: Remove bogus barrier()
        i2c: tegra: Factor out register polling into separate function
        i2c: tegra: Consolidate error handling in tegra_i2c_xfer_msg()
        i2c: tegra: Clean up and improve comments
        i2c: tegra: Rename couple "ret" variables to "err"

v3: - Optimized "Make tegra_i2c_flush_fifos() usable in atomic transfer"
      patch by pre-checking FIFO state before starting to poll using
      ktime API, which may be expensive under some circumstances.

    - The "Clean up messages in the code" patch now makes all messages
      to use proper capitalization of abbreviations. Thanks to Andy Shevchenko
      and Michał Mirosław for the suggestion.

    - The "Remove unnecessary whitespaces and newlines" patch is transformed
      into "Clean up whitespaces and newlines", it now also adds missing
      newlines and spaces.

    - Reworked the "Clean up probe function" patch in accordance to
      suggestion from Michał Mirosław by factoring out only parts of
      the code that make error unwinding cleaner.

    - Added r-b from Michał Mirosław.

    - Added more patches:

        i2c: tegra: Reorder location of functions in the code
        i2c: tegra: Factor out packet header setup from tegra_i2c_xfer_msg()
        i2c: tegra: Remove "dma" variable
        i2c: tegra: Initialization div-clk rate unconditionally
        i2c: tegra: Remove i2c_dev.clk_divisor_non_hs_mode member

v2: - Cleaned more messages in the "Clean up messages in the code" patch.

    - The error code of reset_control_reset() is checked now.

    - Added these new patches to clean up couple more things:

        i2c: tegra: Check errors for both positive and negative values
        i2c: tegra: Improve coding style of tegra_i2c_wait_for_config_load()
        i2c: tegra: Remove unnecessary whitespaces and newlines
        i2c: tegra: Rename variable in tegra_i2c_issue_bus_clear()
        i2c: tegra: Improve driver module description

Dmitry Osipenko (35):
  i2c: tegra: Make tegra_i2c_flush_fifos() usable in atomic transfer
  i2c: tegra: Add missing runtime PM put
  i2c: tegra: Handle potential error of tegra_i2c_flush_fifos()
  i2c: tegra: Mask interrupt in tegra_i2c_issue_bus_clear()
  i2c: tegra: Initialize div-clk rate unconditionally
  i2c: tegra: Remove i2c_dev.clk_divisor_non_hs_mode member
  i2c: tegra: Runtime PM always available on Tegra
  i2c: tegra: Remove error message used for devm_request_irq() failure
  i2c: tegra: Use reset_control_reset()
  i2c: tegra: Use devm_platform_get_and_ioremap_resource()
  i2c: tegra: Use platform_get_irq()
  i2c: tegra: Use clk-bulk helpers
  i2c: tegra: Move out all device-tree parsing into tegra_i2c_parse_dt()
  i2c: tegra: Clean up probe function
  i2c: tegra: Clean up variable types
  i2c: tegra: Reorder location of functions in the code
  i2c: tegra: Remove likely/unlikely from the code
  i2c: tegra: Remove outdated barrier()
  i2c: tegra: Remove redundant check in tegra_i2c_issue_bus_clear()
  i2c: tegra: Remove "dma" variable from tegra_i2c_xfer_msg()
  i2c: tegra: Don't fall back to PIO mode if DMA configuration fails
  i2c: tegra: Improve formatting of variables
  i2c: tegra: Improve coding style of tegra_i2c_wait_for_config_load()
  i2c: tegra: Rename wait/poll functions
  i2c: tegra: Factor out error recovery from tegra_i2c_xfer_msg()
  i2c: tegra: Factor out packet header setup from tegra_i2c_xfer_msg()
  i2c: tegra: Factor out register polling into separate function
  i2c: tegra: Factor out hardware initialization into separate function
  i2c: tegra: Check errors for both positive and negative values
  i2c: tegra: Consolidate error handling in tegra_i2c_xfer_msg()
  i2c: tegra: Clean up variable names
  i2c: tegra: Clean up printk messages
  i2c: tegra: Clean up and improve comments
  i2c: tegra: Clean up whitespaces, newlines and indentation
  i2c: tegra: Improve driver module description

 drivers/i2c/busses/i2c-tegra.c | 1428 ++++++++++++++++----------------
 1 file changed, 698 insertions(+), 730 deletions(-)

-- 
2.27.0