docs: misc-devices/pci-endpoint-test.txt: convert to ReST
- use title markups; - mark literal blocks. Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> Link: https://lore.kernel.org/r/1b1f4e5e57fd2065828cecc9d07afbd247349e94.1592203650.git.mchehab+huawei@kernel.org Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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---------------------------------
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AD525x Digital Potentiometers
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---------------------------------
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.. SPDX-License-Identifier: GPL-2.0
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=============================
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AD525x Digital Potentiometers
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=============================
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The ad525x_dpot driver exports a simple sysfs interface. This allows you to
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work with the immediate resistance settings as well as update the saved startup
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@ -8,9 +10,8 @@ settings. Access to the factory programmed tolerance is also provided, but
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interpretation of this settings is required by the end application according to
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the specific part in use.
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---------
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Files
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---------
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Files
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=====
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Each dpot device will have a set of eeprom, rdac, and tolerance files. How
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many depends on the actual part you have, as will the range of allowed values.
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@ -24,23 +25,22 @@ and may vary greatly on a part-by-part basis. For exact interpretation of
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this field, please consult the datasheet for your part. This is presented
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as a hex file for easier parsing.
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-----------
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Example
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-----------
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Example
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=======
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Locate the device in your sysfs tree. This is probably easiest by going into
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the common i2c directory and locating the device by the i2c slave address.
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the common i2c directory and locating the device by the i2c slave address::
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# ls /sys/bus/i2c/devices/
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0-0022 0-0027 0-002f
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So assuming the device in question is on the first i2c bus and has the slave
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address of 0x2f, we descend (unrelated sysfs entries have been trimmed).
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address of 0x2f, we descend (unrelated sysfs entries have been trimmed)::
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# ls /sys/bus/i2c/devices/0-002f/
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eeprom0 rdac0 tolerance0
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You can use simple reads/writes to access these files:
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You can use simple reads/writes to access these files::
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# cd /sys/bus/i2c/devices/0-002f/
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@ -14,6 +14,7 @@ fit into other categories.
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.. toctree::
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:maxdepth: 2
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ad525x_dpot
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eeprom
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ibmvmc
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ics932s401
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@ -24,7 +24,7 @@ config AD525X_DPOT
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AD5271, AD5272, AD5274
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digital potentiometer chips.
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See Documentation/misc-devices/ad525x_dpot.txt for the
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See Documentation/misc-devices/ad525x_dpot.rst for the
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userspace interface.
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This driver can also be built as a module. If so, the module
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@ -58,7 +58,7 @@
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* AD5272 1 1024 20, 50, 100 (50-TP)
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* AD5274 1 256 20, 50, 100 (50-TP)
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*
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* See Documentation/misc-devices/ad525x_dpot.txt for more info.
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* See Documentation/misc-devices/ad525x_dpot.rst for more info.
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*
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* derived from ad5258.c
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* Copyright (c) 2009 Cyber Switching, Inc.
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