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ARM: da850-lego-ev3: Add device tree node for A/DC

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This adds a node for the TI ADS7957 analog/digital converter on LEGO
MINDSTORMS EV3 as well as a regulator node that is used by the A/DC node.

Signed-off-by: David Lechner <david@lechnology.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
This commit is contained in:
David Lechner 2017-02-07 13:22:07 -06:00 committed by Sekhar Nori
parent c1ae3cfa0e
commit 8a81ff173c
1 changed files with 21 additions and 0 deletions
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21
arch/arm/boot/dts/da850-lego-ev3.dts
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@ -139,6 +139,19 @@
enable-active-high;
regulator-boot-on;
};
/*
* This is a simple voltage divider on VCC5V to provide a 2.5V
* reference signal to the ADC.
*/
adc_ref: regulator2 {
compatible = "regulator-fixed";
regulator-name = "adc ref";
regulator-min-microvolt = <2500000>;
regulator-max-microvolt = <2500000>;
regulator-boot-on;
vin-supply = <&vcc5v>;
};
};
&pmx_core {
@ -293,6 +306,14 @@
};
};
};
adc: adc@3 {
compatible = "ti,ads7957";
reg = <3>;
#io-channel-cells = <1>;
spi-max-frequency = <10000000>;
vref-supply = <&adc_ref>;
};
};
&gpio {