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[v4,0/1] I2C controller support for KEBA PLCs

Message ID 20240731192551.94035-1-gerhard@engleder-embedded.com
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Series I2C controller support for KEBA PLCs | expand

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Gerhard Engleder July 31, 2024, 7:25 p.m. UTC 
KEBA PLCs use a PCIe FPGA to implement several functions in a common
way. This is a first step to include basic support for this FPGA.

Under drivers/misc the cp500 PCI driver is added. This drivers creates
auxiliary devices for every function inside the FPGA. As a first step it
only creates auxiliary devices for the I2C controllers.

The I2C controller driver is added under drivers/i2c/busses like all the
other I2C controller drivers.

This patches enable access to the EEPROMs and to the hardware monitoring
chip of KEBA PLCs.

v4:
- first patch for drivers/misc removed because it is already merged and part of 6.11-rc1

v3:
- first patch is already merged to char-misc-next by Greg KH
- add AUXILIARY_BUS Kconfig dependency
- don't declare int i within for loop (Andi Shyti)
- enable I2C controller as late as possible (Andi Shyti)
- use devm_i2c_add_adapter (Andi Shyti)
- add KI2C_CONTROL_DISABLE (Andi Shyti)

v2:
- use aux bus (Greg KH)
- add Documentation/ABI/ entry for version and keep_cfg sysfs files (Greg KH)
- use sysfs_emit (Greg KH)
- add some information about I2C controller in commit message (Andi Shyti)
- remove old copyright line (Andi Shyti)
- sort header alphabetically (Andi Shyti)
- rework register defines as suggested (Andi Shyti)
- fix block comment style multiple times (Andi Shyti)
- add comment that IN_USE bit is a semaphore (Andi Shyti)
- add comment that IN_USE bit polling sleeps (Andi Shyti)
- addr as first argument of ki2c_wait_for_bit() (Andi Shyti)
- avoid compact style for register flag check (Andi Shyti)
- move bus reset dev_err's to reset implementation (Andi Shyti)
- use dev_err_probe() (Andi Shyti)
- fix 'ki2c_devtype defined but not used' (kernel test robot)
- fix 'WARNING comparing pointer to 0', twice (kernel test robot)
- fix 'Using plain integer as NULL pointer' (kernel test robot)
- fix 'symbol cp035_devices was not declared. Should it be static?', 3 times (kernel test robot)

Gerhard Engleder (1):
  i2c: keba: Add KEBA I2C controller support

 drivers/i2c/busses/Kconfig    |  11 +
 drivers/i2c/busses/Makefile   |   1 +
 drivers/i2c/busses/i2c-keba.c | 593 ++++++++++++++++++++++++++++++++++
 3 files changed, 605 insertions(+)
 create mode 100644 drivers/i2c/busses/i2c-keba.c