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| author | Nicolin Chen <nicoleotsuka@gmail.com> | 2019-04-17 16:12:10 -0700 |
|---|---|---|
| committer | Guenter Roeck <linux@roeck-us.net> | 2019-04-18 06:44:11 -0700 |
| commit | 023912dbb80f5faf7a028aad6562774472d82a5a (patch) | |
| tree | 906ecb878ef4645ad71f1b33f84ed46e2514d2bf /Documentation/hwmon | |
| parent | 521c0b6116ef60e4b96ba42dbf285b2ad69071d4 (diff) | |
| download | lwn-023912dbb80f5faf7a028aad6562774472d82a5a.tar.gz lwn-023912dbb80f5faf7a028aad6562774472d82a5a.zip | |
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>
Diffstat (limited to 'Documentation/hwmon')
| -rw-r--r-- | Documentation/hwmon/ina3221.rst | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/Documentation/hwmon/ina3221.rst b/Documentation/hwmon/ina3221.rst index 1e34abb38b59..f6007ae8f4e2 100644 --- a/Documentation/hwmon/ina3221.rst +++ b/Documentation/hwmon/ina3221.rst @@ -46,4 +46,17 @@ samples Number of samples using in the averaging mode. Supports the list of number of samples: 1, 4, 16, 64, 128, 256, 512, 1024 + +update_interval Data conversion time in millisecond, following: + + update_interval = C x S x (BC + SC) + + * C: number of enabled channels + * S: number of samples + * BC: bus-voltage conversion time in millisecond + * SC: shunt-voltage conversion time in millisecond + + Affects both Bus- and Shunt-voltage conversion time. + Note that setting update_interval to 0ms sets both BC + and SC to 140 us (minimum conversion time). ======================= ======================================================= |