[PATCH v2 2/2] docs: hwmon: Document max127 driver

rentao.bupt
2020-11-18T23:10:14Z

From: Tao Ren <rentao.bupt@gmail.com>

Add documentation for the max127 hardware monitoring driver.

Signed-off-by: Tao Ren <rentao.bupt@gmail.com>
---
Changes in v2:
- add more description for min/max sysfs nodes.
- convert values from volt to millivolt in the document.

Documentation/hwmon/index.rst | 1 +
Documentation/hwmon/max127.rst | 45 ++++++++++++++++++++++++++++++++++
2 files changed, 46 insertions(+)
create mode 100644 Documentation/hwmon/max127.rst

diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
index 408760d13813..0a07b6000c20 100644
--- a/Documentation/hwmon/index.rst
+++ b/Documentation/hwmon/index.rst
@@ -111,6 +111,7 @@ Hardware Monitoring Kernel Drivers
ltc4245
ltc4260
ltc4261
+ max127
max16064
max16065
max1619
diff --git a/Documentation/hwmon/max127.rst b/Documentation/hwmon/max127.rst
new file mode 100644
index 000000000000..dc192dd9c37c
--- /dev/null
+++ b/Documentation/hwmon/max127.rst
@@ -0,0 +1,45 @@
+.. SPDX-License-Identifier: GPL-2.0-or-later
+
+Kernel driver max127
+====================
+
+Author:
+
+ * Tao Ren <rentao.bupt@gmail.com>
+
+Supported chips:
+
+ * Maxim MAX127
+
+ Prefix: 'max127'
+
+ Datasheet: https://datasheets.maximintegrated.com/en/ds/MAX127-MAX128.pdf
+
+Description
+-----------
+
+The MAX127 is a multirange, 12-bit data acquisition system (DAS) providing
+8 analog input channels that are independently software programmable for
+a variety of ranges. The available ranges are {0,5V}, {0,10V}, {-5,5V}
+and {-10,10V}.
+
+The MAX127 features a 2-wire, I2C-compatible serial interface that allows
+communication among multiple devices using SDA and SCL lines.
+
+Sysfs interface
+---------------
+
+ ============== ==============================================================
+ in[0-7]_input The input voltage (in mV) of the corresponding channel.
+ RO
+
+ in[0-7]_min The lower input limit (in mV) for the corresponding channel.
+ ADC range and LSB will be updated when the limit is changed.
+ For the MAX127, it will be adjusted to -10000, -5000, or 0.
+ RW
+
+ in[0-7]_max The higher input limit (in mV) for the corresponding channel.
+ ADC range and LSB will be updated when the limit is changed.
+ For the MAX127, it will be adjusted to 0, 5000, or 10000.
+ RW
+ ============== ==============================================================
--
2.17.1