[PATCH v4 00/31] Improvements for Tegra I2C driver

Dmitry Osipenko
2020-09-05T20:47:15Z

Hello!

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

Changelog:

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 (31):
i2c: tegra: Make tegra_i2c_flush_fifos() usable in atomic transfer
i2c: tegra: Handle potential error of tegra_i2c_flush_fifos()
i2c: tegra: Initialization 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: Factor out runtime PM and hardware initialization
i2c: tegra: Move out all device-tree parsing into tegra_i2c_parse_dt()
i2c: tegra: Clean up probe function
i2c: tegra: Remove likely/unlikely from the code
i2c: tegra: Remove bogus barrier()
i2c: tegra: Remove "dma" variable from tegra_i2c_xfer_msg()
i2c: tegra: Improve formatting of function variables
i2c: tegra: Improve coding style of tegra_i2c_wait_for_config_load()
i2c: tegra: Rename wait/poll functions
i2c: tegra: Rename variable in tegra_i2c_issue_bus_clear()
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: Reorder location of functions in the code
i2c: tegra: Check errors for both positive and negative values
i2c: tegra: Consolidate error handling in tegra_i2c_xfer_msg()
i2c: tegra: Clean up printk messages
i2c: tegra: Clean up whitespaces, newlines and indentation
i2c: tegra: Improve driver module description
i2c: tegra: Clean up and improve comments
i2c: tegra: Rename couple "ret" variables to "err"

drivers/i2c/busses/i2c-tegra.c | 1272 +++++++++++++++-----------------
1 file changed, 612 insertions(+), 660 deletions(-)

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2.27.0