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| author | Jerome Brunet <jbrunet@baylibre.com> | 2024-12-02 11:28:01 +0100 |
|---|---|---|
| committer | Guenter Roeck <linux@roeck-us.net> | 2024-12-14 08:00:44 -0800 |
| commit | 83bed3c159f44bf2e205875feb8d932bbcf1b656 (patch) | |
| tree | 12fb9fbc711d6d8d068efbc4c9361375c09623dd /Documentation/hwmon | |
| parent | f40452577557caf0e5d0ff182da8479c3d492ac5 (diff) | |
| download | linux-83bed3c159f44bf2e205875feb8d932bbcf1b656.tar.gz linux-83bed3c159f44bf2e205875feb8d932bbcf1b656.tar.bz2 linux-83bed3c159f44bf2e205875feb8d932bbcf1b656.zip | |
hwmon: (pmbus/core) add wp module param
Add a module parameter to force the write protection mode of pmbus chips.
4 protections modes are provided to start with:
* 0: Remove the write protection
* 1: Disable all writes except to the WRITE_PROTECT, OPERATION,
PAGE, ON_OFF_CONFIG and VOUT_COMMAND commands
* 2: Disable all writes except to the WRITE_PROTECT, OPERATION and
PAGE commands
* 3: Disable all writes except to the WRITE_PROTECT command
Of course, if the parameter is not provided, the default write protection
status of the pmbus chips is left untouched.
Suggested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'Documentation/hwmon')
| -rw-r--r-- | Documentation/hwmon/pmbus-core.rst | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/Documentation/hwmon/pmbus-core.rst b/Documentation/hwmon/pmbus-core.rst index 0a251960f891..fdfb23773148 100644 --- a/Documentation/hwmon/pmbus-core.rst +++ b/Documentation/hwmon/pmbus-core.rst @@ -387,3 +387,24 @@ PMBUS_VOUT_PROTECTED Set if the chip VOUT_COMMAND command is protected and protection is not determined by the standard WRITE_PROTECT command. + +Module parameter +---------------- + +pmbus_core.wp: PMBus write protect forced mode + +PMBus may come up with a variety of write protection configuration. +'pmbus_core.wp' may be used if a particular write protection is necessary. +The ability to actually alter the protection may also depend on the chip +so the actual runtime write protection configuration may differ from +the requested one. pmbus_core currently support the following value: + +* 0: write protection removed. +* 1: Disable all writes except to the WRITE_PROTECT, OPERATION, + PAGE, ON_OFF_CONFIG and VOUT_COMMAND commands. +* 2: Disable all writes except to the WRITE_PROTECT, OPERATION and + PAGE commands. +* 3: Disable all writes except to the WRITE_PROTECT command. Note that + protection should include the PAGE register. This may be problematic + for multi-page chips, if the chips strictly follows the PMBus + specification, preventing the chip from changing the active page. |