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b98948b042
Add Toradex Verdin Ivy carrier board support. One notable feature of Ivy
is the analog inputs. These inputs are multiplexed, allowing the same
input to measure either voltage or current. For current measurements,
a GPIO switch enables or disables the shunt resistor. This process is
automatically managed by the Linux kernel using the IIO and MUX
subsystems. Voltage measurement is always enabled, but the voltage
measured by the ADC is scaled by a cascade voltage divider. In the
device tree, the equivalent gain of the voltage divider is used, which
can be calculated as follows:
------------
+ |
.-.
R1=30K | |
| |
'-'
|-------------------
Analog Input (AIN) | |
.-. .-.
R2=10K | | R3=30K | |
| | | |
'-' '-'
| |
| |--------
| .-. +
| R4=10K | |
| | | ADC Input (Channels 0 and 1)
| '-'
- | | -
-----------| |--------
=== ===
GND GND
Vin = Analog Input (AIN)
Vout = ADC Input
Rth = Thevenin Equiv. Resistance
Vth = Thevenin Equiv. Voltage
RL = Load Resistor
R1 = 30K, R2 = 10K, R3 = 30K, R4 = 10K
RL = R4 = 10K
Rth = (R1 // R2) + R3 = 37500 Ohms
Vth = (Vin * R2) / (R1 + R2) = Vin/4;
Vout = (Vth * RL)/ (Rth + RL) = Vth/4.75 = Vin/19
Gain = Vout/Vin = 1/19
https://www.toradex.com/products/carrier-board/ivy-carrier-board
Signed-off-by: João Paulo Gonçalves <joao.goncalves@toradex.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
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Linux kernel
============
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Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
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There are various text files in the Documentation/ subdirectory,
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Please read the Documentation/process/changes.rst file, as it contains the
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the problems which may result by upgrading your kernel.