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881f5e9d80
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> Link: https://lore.kernel.org/r/20240924120044.130913-4-francesco@dolcini.it Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.