V4: - Added bus lock to i2c_dw_init() as suggested by Jarrko Nikula <jarkko.nikula@xxxxxxxxxxxxxxx>. Addresses infrequent hang that was seen occuring during probe. - Added label in i2c_dw_xfer() to bypass unnecessary lock release when acquire fails. Suggested by Mika. - Changed make to build driver as composite addition to i2c-designware-platform. Driver can be module or built-in following the platform driver selection. Tested as both. - Added EPROBE_DEFER return to baytrail definition of i2c_dw_eval_lock() to defer probe if iosf_mbi driver (required for acquring bus lock) is not available. V3: - Split lock support and driver into separate patches - Change module build to bool. Platforms running without this driver cannot perform critical functions such as charging. Furthermore attempts by other drivers to access the i2c bus without a lock will hang the platform. - Replaced has_hw_lock flag with acquire/release function pointers. - Replaced acquire/release ifdef code with single i2c_dw_eval_lock_support() test for cleaner (if still undesirable) compile time scalability. Future Intel platforms will however continue to use the Baytrail driver. V2: - Moved semaphore detection out of dw platform driver - Replaced function pointers with defined acquire/release functions in dw core. This helps eliminate the ifdefery in the dw platform driver. - Use new has_hw_lock flag to check if the lock exists on a given bus. - Use new pm_runtime_disabled flag to conditionally turnoff runtime pm in the dw platform driver. David E. Box (2): i2c-designware: Add i2c bus locking support i2c-designware: Add Intel Baytrail PMIC I2C bus support drivers/i2c/busses/Kconfig | 11 ++ drivers/i2c/busses/Makefile | 1 + drivers/i2c/busses/i2c-designware-baytrail.c | 160 +++++++++++++++++++++++++++ drivers/i2c/busses/i2c-designware-core.c | 26 +++++ drivers/i2c/busses/i2c-designware-core.h | 12 ++ drivers/i2c/busses/i2c-designware-platdrv.c | 20 +++- 6 files changed, 225 insertions(+), 5 deletions(-) create mode 100644 drivers/i2c/busses/i2c-designware-baytrail.c -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
