From e4067b75fb6ca83a58b2c342a0b3ee12e1223c4e Mon Sep 17 00:00:00 2001 From: Sascha Hauer Date: Thu, 21 Jun 2018 13:44:30 +0200 Subject: dts: update to v4.18-rc1 Signed-off-by: Sascha Hauer --- dts/Bindings/iio/afe/voltage-divider.txt | 53 ++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) create mode 100644 dts/Bindings/iio/afe/voltage-divider.txt (limited to 'dts/Bindings/iio/afe/voltage-divider.txt') diff --git a/dts/Bindings/iio/afe/voltage-divider.txt b/dts/Bindings/iio/afe/voltage-divider.txt new file mode 100644 index 0000000000..b452a84061 --- /dev/null +++ b/dts/Bindings/iio/afe/voltage-divider.txt @@ -0,0 +1,53 @@ +Voltage divider +=============== + +When an io-channel measures the midpoint of a voltage divider, the +interesting voltage is often the voltage over the full resistance +of the divider. This binding describes the voltage divider in such +a curcuit. + + Vin ----. + | + .-----. + | R | + '-----' + | + +---- Vout + | + .-----. + | Rout| + '-----' + | + GND + +Required properties: +- compatible : "voltage-divider" +- io-channels : Channel node of a voltage io-channel measuring Vout. +- output-ohms : Resistance Rout over which the output voltage is measured. + See full-ohms. +- full-ohms : Resistance R + Rout for the full divider. The io-channel + is scaled by the Rout / (R + Rout) quotient. + +Example: +The system voltage is circa 12V, but divided down with a 22/222 +voltage divider (R = 200 Ohms, Rout = 22 Ohms) and fed to an ADC. + +sysv { + compatible = "voltage-divider"; + io-channels = <&maxadc 1>; + + /* Scale the system voltage by 22/222 to fit the ADC range. */ + output-ohms = <22>; + full-ohms = <222>; /* 200 + 22 */ +}; + +&spi { + maxadc: adc@0 { + compatible = "maxim,max1027"; + reg = <0>; + #io-channel-cells = <1>; + interrupt-parent = <&gpio5>; + interrupts = <15 IRQ_TYPE_EDGE_RISING>; + spi-max-frequency = <1000000>; + }; +}; -- cgit v1.2.3