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| author | Ingo Molnar <mingo@kernel.org> | 2014-08-22 08:04:15 (GMT) |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2014-08-22 08:04:15 (GMT) |
| commit | 80b304fd00e8b667775ff791121b61ecd7cd0c03 (patch) | |
| tree | b4f2ec59fe062c43343ee4c2f10a6bcd0e4dcd1b /Documentation/hwmon/powr1220 | |
| parent | fb21b84e7f809ef04b1e5aed5d463cf0d4866638 (diff) | |
| parent | 6a7519e81321343165f89abb8b616df186d3e57a (diff) | |
| download | linux-80b304fd00e8b667775ff791121b61ecd7cd0c03.tar.xz | |
Merge tag 'efi-urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/mfleming/efi into x86/urgent
Pull EFI fixes from Matt Fleming:
* WARN_ON(!spin_is_locked()) always triggers on non-SMP machines.
Swap it for the more canonical lockdep_assert_held() which always
does the right thing - Guenter Roeck
* Assign the correct value to efi.runtime_version on arm64 so that all
the runtime services can be invoked - Semen Protsenko
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'Documentation/hwmon/powr1220')
| -rw-r--r-- | Documentation/hwmon/powr1220 | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/Documentation/hwmon/powr1220 b/Documentation/hwmon/powr1220 new file mode 100644 index 0000000..21e44f7 --- /dev/null +++ b/Documentation/hwmon/powr1220 @@ -0,0 +1,45 @@ +Kernel driver powr1220 +================== + +Supported chips: + * Lattice POWR1220AT8 + Prefix: 'powr1220' + Addresses scanned: none + Datasheet: Publicly available at the Lattice website + http://www.latticesemi.com/ + +Author: Scott Kanowitz <scott.kanowitz@gmail.com> + +Description +----------- + +This driver supports the Lattice POWR1220AT8 chip. The POWR1220 +includes voltage monitoring for 14 inputs as well as trim settings +for output voltages and GPIOs. This driver implements the voltage +monitoring portion of the chip. + +Voltages are sampled by a 12-bit ADC with a step size of 2 mV. +An in-line attenuator allows measurements from 0 to 6 V. The +attenuator is enabled or disabled depending on the setting of the +input's max value. The driver will enable the attenuator for any +value over the low measurement range maximum of 2 V. + +The input naming convention is as follows: + +driver name pin name +in0 VMON1 +in1 VMON2 +in2 VMON3 +in2 VMON4 +in4 VMON5 +in5 VMON6 +in6 VMON7 +in7 VMON8 +in8 VMON9 +in9 VMON10 +in10 VMON11 +in11 VMON12 +in12 VCCA +in13 VCCINP + +The ADC readings are updated on request with a minimum period of 1s. |