From: "Ainux.Wang" <ainux.wang@xxxxxxxxx> PART 1 (The chip driver): Add support for MP2949A device from Monolithic Power Systems, Inc. (MPS). This is a triple-loop, digital, multi-phase controller. This device: - Supports up to three power rail. - Provides 6 pulse-width modulations (PWMs), and can be configured up to 6-phase operation for Rail A , up to 2-phase operation for Rail B and up to 1-phase operation for Rail C. - The PMBus registers are distributed into three pages: Page 0, Page 1, Page 2. Page 0 contains the registers for Rail A and most of the common settings for all of the rails. Page 1 contains register information for Rail B. Page 2 contains register information for Rail C. - The MP2949A supports both 5mV VID step and 10mv VID step for IMVP8 and IMVP9. v6: - Add mp2949a_read_byte_data(), mp2949a_read_word_data(), and the mp2949a do not support STATUS_BYTE, STATUS_WORD, and VOUT_MODE ,but return some random data when reading them. v5: - Moved change log to right here. v4: - Removed mp2949a_read_byte_data(). - Added space before and after '-' and fixed a bug that is '~' on line 35. v3: - Added change log here. - Errors in the document have been modified. - Fixed PMBUS_VOUT_MODE to MP2949A_MFR_VR_CONFIG. - Removed unnecessary vout_params and empty line. v2: - Reference has been added to Documentation/hwmon/index.rst. - Droped 'vendor'. - Removed change codes of the PMBus core and added mp2949a_identify() and mp2949a_read_byte_data() to this driver. v1: - Add support for MPS MP2949A. PART 2(PMbus Core): There is a case(like MP2949A) that the chip do not support STATUS_WORD and STATUS_BYTE command, but return some random data when reading. So we should call read_status() instead of i2c_smbus_read_word_data() and i2c_smbus_read_byte_data(), and the chip driver should implement a read_word_data() function and a read_byte_data() function to return -ENXIO. Ainux.Wang (2): hwmon: (pmbus) Add support for MPS MP2949A hwmon: (pmbus) Try use read_status() to read status register Documentation/hwmon/index.rst | 1 + Documentation/hwmon/mp2949a.rst | 44 ++++++++++ drivers/hwmon/pmbus/Kconfig | 9 ++ drivers/hwmon/pmbus/Makefile | 1 + drivers/hwmon/pmbus/mp2949a.c | 136 +++++++++++++++++++++++++++++++ drivers/hwmon/pmbus/pmbus_core.c | 20 +++-- 6 files changed, 206 insertions(+), 5 deletions(-) create mode 100644 Documentation/hwmon/mp2949a.rst create mode 100644 drivers/hwmon/pmbus/mp2949a.c -- 2.18.1
