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[v7,0/4] add support for Socionext SynQuacer I2C controller

Message ID 20180403191151.14924-1-ard.biesheuvel@linaro.org
Headers show
Series add support for Socionext SynQuacer I2C controller | expand

Message

Ard Biesheuvel April 3, 2018, 7:11 p.m. UTC 
Add a binding and a driver for the I2C IP found in the Socionext SynQuacer
SoC, which is essentially a rebranded version of the Fujitsu F_I2C controller.

v7;
- remove recovery and suspend/resume support for now
- add myself as maintainer for this driver
- use WARN_ON() in i2c_transfer() sanity check

v6:
- use i2c_8bit_addr_from_msg() instead of open coding the address generation
- switch to generic recovery using minimal helpers to drive the SDA/SCL lines
  directly
- use reinit_completion() and move init_completion() to probe function
- replace bus free detection at the end of a transfer with a simple udelay()
  for 2 clock periods
- don't recover on every error
- don't call synquacer_i2c_hw_init() from synquacer_i2c_hw_reset(), since it
  will be always called twice in that case
- add patch to sanity check i2c_transfer() arguments in core code (#3)

v5:
- add Rob's ack to #1
- drop unnecessary 'platform_set_drvdata(pdev, NULL)' in remove path (#2)

v4:
- clarify binding that only a single interrupt specifier is expected (#1)
- check return value of clk_prepare_enable() on probe path (#2)
- add Andy's R-b to patch #2

v3:
- incorporate more of Andy's review comments (#2), especially regarding the
  bus speed and clock source handling for ACPI
- patch #1 unchanged.

v2:
- incorporate Andy's review comments (#2)
- patch #1 unchanged.

Ard Biesheuvel (4):
  dt-bindings: i2c: add binding for Socionext SynQuacer I2C
  i2c: add support for Socionext SynQuacer I2C controller
  i2c: add param sanity check to i2c_transfer()
  MAINTAINERS: add Ard as Socionext SynQuacer I2C driver maintainer

 Documentation/devicetree/bindings/i2c/i2c-synquacer.txt |  29 +
 MAINTAINERS                                             |   6 +
 drivers/i2c/busses/Kconfig                              |  10 +
 drivers/i2c/busses/Makefile                             |   1 +
 drivers/i2c/busses/i2c-synquacer.c                      | 669 ++++++++++++++++++++
 drivers/i2c/i2c-core-base.c                             |   3 +
 6 files changed, 718 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/i2c-synquacer.txt
 create mode 100644 drivers/i2c/busses/i2c-synquacer.c

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2.15.1