hwmon: (ina3221) Add voltage conversion time settings
The CONFIG register has two 3-bit fields for conversion time settings of Bus-voltage and Shunt-voltage, respectively. The conversion settings, along with averaging mode, allow users to optimize available timing requirement. This patch adds an 'update_interval' sysfs node through the hwmon_chip_info of hwmon core. It reflects a total hardware conversion time: samples * channels * (Bus + Shunt conversion times) Though INA3221 supports different conversion time setups for Bus and Shunt voltages, this patch only adds the support of a unified setting for both conversion times, by dividing the conversion time into two equal values. Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com> [groeck: .rst related formatting changes in documentation] Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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