hwmon: (pmbus) Document Infineon PXE1610 driver

Added documentation for Infineon PXE1610 driver

Signed-off-by: Vijay Khemka <vijaykhemka@fb.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/Documentation/hwmon/pxe1610 b/Documentation/hwmon/pxe1610
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+Kernel driver pxe1610
+=====================
+
+Supported chips:
+  * Infineon PXE1610
+    Prefix: 'pxe1610'
+    Addresses scanned: -
+    Datasheet: Datasheet is not publicly available.
+
+  * Infineon PXE1110
+    Prefix: 'pxe1110'
+    Addresses scanned: -
+    Datasheet: Datasheet is not publicly available.
+
+  * Infineon PXM1310
+    Prefix: 'pxm1310'
+    Addresses scanned: -
+    Datasheet: Datasheet is not publicly available.
+
+Author: Vijay Khemka <vijaykhemka@fb.com>
+
+
+Description
+-----------
+
+PXE1610/PXE1110 are Multi-rail/Multiphase Digital Controllers
+and compliant to
+       -- Intel VR13 DC-DC converter specifications.
+       -- Intel SVID protocol.
+Used for Vcore power regulation for Intel VR13 based microprocessors
+       -- Servers, Workstations, and High-end desktops
+
+PXM1310 is a Multi-rail Controller and it is compliant to
+       -- Intel VR13 DC-DC converter specifications.
+       -- Intel SVID protocol.
+Used for DDR3/DDR4 Memory power regulation for Intel VR13 and
+IMVP8 based systems
+
+
+Usage Notes
+-----------
+
+This driver does not probe for PMBus devices. You will have
+to instantiate devices explicitly.
+
+Example: the following commands will load the driver for an PXE1610
+at address 0x70 on I2C bus #4:
+
+# modprobe pxe1610
+# echo pxe1610 0x70 > /sys/bus/i2c/devices/i2c-4/new_device
+
+It can also be instantiated by declaring in device tree
+
+
+Sysfs attributes
+----------------
+
+curr1_label            "iin"
+curr1_input            Measured input current
+curr1_alarm            Current high alarm
+
+curr[2-4]_label                "iout[1-3]"
+curr[2-4]_input                Measured output current
+curr[2-4]_crit         Critical maximum current
+curr[2-4]_crit_alarm   Current critical high alarm
+
+in1_label              "vin"
+in1_input              Measured input voltage
+in1_crit               Critical maximum input voltage
+in1_crit_alarm         Input voltage critical high alarm
+
+in[2-4]_label          "vout[1-3]"
+in[2-4]_input          Measured output voltage
+in[2-4]_lcrit          Critical minimum output voltage
+in[2-4]_lcrit_alarm    Output voltage critical low alarm
+in[2-4]_crit           Critical maximum output voltage
+in[2-4]_crit_alarm     Output voltage critical high alarm
+
+power1_label           "pin"
+power1_input           Measured input power
+power1_alarm           Input power high alarm
+
+power[2-4]_label       "pout[1-3]"
+power[2-4]_input       Measured output power
+
+temp[1-3]_input                Measured temperature
+temp[1-3]_crit         Critical high temperature
+temp[1-3]_crit_alarm   Chip temperature critical high alarm
+temp[1-3]_max          Maximum temperature
+temp[1-3]_max_alarm    Chip temperature high alarm