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authorKun Yi <kunyi@google.com>2018-10-17 15:26:39 -0700
committerGuenter Roeck <linux@roeck-us.net>2018-12-02 16:25:28 -0800
commit6e5c06ad94115e58e4f274bdaed2618b1e39ac38 (patch)
treea3387ddd7eb5f29ccf5621f22a2671c8504d0b91 /Documentation/hwmon
parentf567035a6187f1a5e7f86d4da4dbbca46cb68082 (diff)
downloadlinux-6e5c06ad94115e58e4f274bdaed2618b1e39ac38.tar.bz2
hwmon: (adm1275) Allow setting shunt reg value
The ADM series of hotswap controllers support extending the current measurement range by using a sensing resistor value other than the typical 1 mOhm. For example, using a 0.5 mOhm sensing resistor doubles the maximal current can be measured. Current driver assumes a shunt resistor value of 1 mOhm in calculation, meaning for other resistor values, hwmon will report scaled current/power measurements. This patch parses device tree parameter "shunt-resistor-micro-ohms", if there is one. Signed-off-by: Kun Yi <kunyi@google.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'Documentation/hwmon')
-rw-r--r--Documentation/hwmon/adm12753
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/hwmon/adm1275 b/Documentation/hwmon/adm1275
index 39033538eb03..5e277b0d91ce 100644
--- a/Documentation/hwmon/adm1275
+++ b/Documentation/hwmon/adm1275
@@ -58,6 +58,9 @@ The ADM1075, unlike many other PMBus devices, does not support internal voltage
or current scaling. Reported voltages, currents, and power are raw measurements,
and will typically have to be scaled.
+The shunt value in micro-ohms can be set via device tree at compile-time. Please
+refer to the Documentation/devicetree/bindings/hwmon/adm1275.txt for bindings
+if the device tree is used.
Platform data support
---------------------