57 lines
1.4 KiB
Diff
57 lines
1.4 KiB
Diff
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From 8a81ff173c5c9a0ab1df84fab17971dbcce8490a Mon Sep 17 00:00:00 2001
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From: David Lechner <david@lechnology.com>
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Date: Tue, 7 Feb 2017 13:22:07 -0600
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Subject: 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
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MINDSTORMS EV3 as well as a regulator node that is used by the A/DC node.
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Signed-off-by: David Lechner <david@lechnology.com>
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Signed-off-by: Sekhar Nori <nsekhar@ti.com>
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---
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arch/arm/boot/dts/da850-lego-ev3.dts | 21 +++++++++++++++++++++
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1 file changed, 21 insertions(+)
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diff --git a/arch/arm/boot/dts/da850-lego-ev3.dts b/arch/arm/boot/dts/da850-lego-ev3.dts
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index 112ec92..0309537 100644
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--- a/arch/arm/boot/dts/da850-lego-ev3.dts
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+++ b/arch/arm/boot/dts/da850-lego-ev3.dts
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@@ -139,6 +139,19 @@
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enable-active-high;
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regulator-boot-on;
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};
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+
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+ /*
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+ * This is a simple voltage divider on VCC5V to provide a 2.5V
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+ * reference signal to the ADC.
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+ */
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+ adc_ref: regulator2 {
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+ compatible = "regulator-fixed";
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+ regulator-name = "adc ref";
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+ regulator-min-microvolt = <2500000>;
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+ regulator-max-microvolt = <2500000>;
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+ regulator-boot-on;
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+ vin-supply = <&vcc5v>;
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+ };
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};
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&pmx_core {
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@@ -293,6 +306,14 @@
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};
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};
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};
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+
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+ adc: adc@3 {
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+ compatible = "ti,ads7957";
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+ reg = <3>;
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+ #io-channel-cells = <1>;
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+ spi-max-frequency = <10000000>;
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+ vref-supply = <&adc_ref>;
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+ };
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};
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&gpio {
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--
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cgit v1.1
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