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| author | Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2020-06-15 08:50:13 +0200 |
|---|---|---|
| committer | Jonathan Corbet <corbet@lwn.net> | 2020-06-19 22:05:49 +0200 |
| commit | 8a05eb89cb84eba1091bdc6baa9d0e463655779f (patch) | |
| tree | 821de190af69dd16eeed8ccc480864275f13af31 /Documentation/misc-devices | |
| parent | docs: misc-devices/spear-pcie-gadget.txt: convert to ReST (diff) | |
| download | linux-8a05eb89cb84eba1091bdc6baa9d0e463655779f.tar.xz linux-8a05eb89cb84eba1091bdc6baa9d0e463655779f.zip | |
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>
Diffstat (limited to 'Documentation/misc-devices')
| -rw-r--r-- | Documentation/misc-devices/ad525x_dpot.rst (renamed from Documentation/misc-devices/ad525x_dpot.txt) | 24 | ||||
| -rw-r--r-- | Documentation/misc-devices/index.rst | 1 |
2 files changed, 13 insertions, 12 deletions
diff --git a/Documentation/misc-devices/ad525x_dpot.txt b/Documentation/misc-devices/ad525x_dpot.rst index 0c9413b1cbf3..6483ec254520 100644 --- a/Documentation/misc-devices/ad525x_dpot.txt +++ b/Documentation/misc-devices/ad525x_dpot.rst @@ -1,6 +1,8 @@ ---------------------------------- - AD525x Digital Potentiometers ---------------------------------- +.. SPDX-License-Identifier: GPL-2.0 + +============================= +AD525x Digital Potentiometers +============================= The ad525x_dpot driver exports a simple sysfs interface. This allows you to work with the immediate resistance settings as well as update the saved startup @@ -8,9 +10,8 @@ settings. Access to the factory programmed tolerance is also provided, but interpretation of this settings is required by the end application according to the specific part in use. ---------- - Files ---------- +Files +===== Each dpot device will have a set of eeprom, rdac, and tolerance files. How many depends on the actual part you have, as will the range of allowed values. @@ -24,23 +25,22 @@ and may vary greatly on a part-by-part basis. For exact interpretation of this field, please consult the datasheet for your part. This is presented as a hex file for easier parsing. ------------ - Example ------------ +Example +======= Locate the device in your sysfs tree. This is probably easiest by going into -the common i2c directory and locating the device by the i2c slave address. +the common i2c directory and locating the device by the i2c slave address:: # ls /sys/bus/i2c/devices/ 0-0022 0-0027 0-002f So assuming the device in question is on the first i2c bus and has the slave -address of 0x2f, we descend (unrelated sysfs entries have been trimmed). +address of 0x2f, we descend (unrelated sysfs entries have been trimmed):: # ls /sys/bus/i2c/devices/0-002f/ eeprom0 rdac0 tolerance0 -You can use simple reads/writes to access these files: +You can use simple reads/writes to access these files:: # cd /sys/bus/i2c/devices/0-002f/ diff --git a/Documentation/misc-devices/index.rst b/Documentation/misc-devices/index.rst index 56fc1e03488a..d05626dd0fbb 100644 --- a/Documentation/misc-devices/index.rst +++ b/Documentation/misc-devices/index.rst @@ -14,6 +14,7 @@ fit into other categories. .. toctree:: :maxdepth: 2 + ad525x_dpot eeprom ibmvmc ics932s401 |