path: root/Documentation/hwmon
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authorNicolin Chen <nicoleotsuka@gmail.com>2019-04-17 16:12:10 -0700
committerGuenter Roeck <linux@roeck-us.net>2019-04-18 06:44:11 -0700
commit023912dbb80f5faf7a028aad6562774472d82a5a (patch)
tree906ecb878ef4645ad71f1b33f84ed46e2514d2bf /Documentation/hwmon
parenthwmon: (ina3221) Do not read-back to cache reg_config (diff)
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')
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).
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