mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-22 20:23:57 +08:00
f4ff415564
This patch adds support for Lattice's POWR1220 power manager IC. Read access to all the ADCs on the chip are supported through the hwmon sysfs files. Signed-off-by: Scott Kanowitz <skanowitz@echo360.com> [Guenter Roeck: Removed some extra ( )] Signed-off-by: Guenter Roeck <linux@roeck-us.net>
46 lines
1.3 KiB
Plaintext
46 lines
1.3 KiB
Plaintext
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.
|