Add I2C statistics such as Bus Error counts and NACK counts as sysfs attributes so they don't need to live in debugfs. There are a few I2C statistics that are implemented in many I2C controllers, such as bus error counts and NACK counts. Having those statistics in sysfs will 1) allow for a unified definition across various I2C drivers, and 2) make the statistics more ABI-stable and available on devices with the debugfs disabled. Overall the patch works as the following way: 1) An I2C statistics sysfs directory is created. 2) Each specific I2C driver is responsible for instantiating the statistics available. Test Process: 1. Clone the OpenBMC repository 2. `devtool modify`and apply patch to the linux-nuvoton recipe 3. Build image for quanta-gsj 4. Build QEMU 5. Run the image-bmc image in QEMU Results: root@gsj:/sys/class/i2c-adapter/i2c-1/stats# ls ber_cnt i2c_speed nack_cnt rec_fail_cnt rec_succ_cnt timeout_cnt tx_complete_cnt root@gsj:/sys/class/i2c-adapter/i2c-1/stats# cat * 0 100000 0 0 0 0 53 Sui Chen (2): i2c debug counters as sysfs attributes add npcm7xx debug counters as sysfs attributes Tali Perry (1): i2c: npcm7xx: add tx_complete counter drivers/i2c/busses/i2c-npcm7xx.c | 13 ++++ drivers/i2c/i2c-core-base.c | 2 + drivers/i2c/i2c-dev.c | 103 +++++++++++++++++++++++++++++++ include/linux/i2c.h | 27 ++++++++ 4 files changed, 145 insertions(+) -- 2.34.0.384.gca35af8252-goog
