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From 6d5e32067cf3f3169ec15097c175878de365d247 Mon Sep 17 00:00:00 2001
From: Scott Ellis <scott@jumpnowtek.com>
Date: Wed, 1 Mar 2017 07:22:24 -0500
Subject: [PATCH] Add overlay for ads1115 ADCs (#1864)
---
arch/arm/boot/dts/overlays/Makefile | 1 +
arch/arm/boot/dts/overlays/README | 22 ++++++
arch/arm/boot/dts/overlays/ads1115-overlay.dts | 103 +++++++++++++++++++++++++
3 files changed, 126 insertions(+)
create mode 100644 arch/arm/boot/dts/overlays/ads1115-overlay.dts
--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -4,6 +4,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
adau1977-adc.dtbo \
adau7002-simple.dtbo \
ads1015.dtbo \
+ ads1115.dtbo \
ads7846.dtbo \
akkordion-iqdacplus.dtbo \
allo-piano-dac-pcm512x-audio.dtbo \
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -196,6 +196,28 @@ Params: addr I2C bus
http://www.ti.com/lit/ds/symlink/ads1015.pdf
+Name: ads1115
+Info: Texas Instruments ADS1115 ADC
+Load: dtoverlay=ads1115,<param>[=<val>]
+Params: addr I2C bus address of device. Set based on how the
+ addr pin is wired. (default=0x48 assumes addr
+ is pulled to GND)
+ cha_enable Enable virtual channel a.
+ cha_cfg Set the configuration for virtual channel a.
+ (default=4 configures this channel for the
+ voltage at A0 with respect to GND)
+ cha_datarate Set the datarate (samples/sec) for this channel.
+ (default=7 sets 860 sps)
+ cha_gain Set the gain of the Programmable Gain
+ Amplifier for this channel. (Default 1 sets the
+ full scale of the channel to 4.096 Volts)
+
+ Channel parameters can be set for each enabled channel.
+ A maximum of 4 channels can be enabled (letters a thru d).
+ For more information refer to the device datasheet at:
+ http://www.ti.com/lit/ds/symlink/ads1115.pdf
+
+
Name: ads7846
Info: ADS7846 Touch controller
Load: dtoverlay=ads7846,<param>=<val>
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/ads1115-overlay.dts
@@ -0,0 +1,103 @@
+/*
+ * TI ADS1115 multi-channel ADC overlay
+ */
+
+/dts-v1/;
+/plugin/;
+
+/ {
+ compatible = "brcm,bcm2708";
+
+ fragment@0 {
+ target = <&i2c_arm>;
+ __overlay__ {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ status = "okay";
+
+ ads1115: ads1115 {
+ compatible = "ti,ads1115";
+ status = "okay";
+ #address-cells = <1>;
+ #size-cells = <0>;
+ reg = <0x48>;
+ };
+ };
+ };
+
+ fragment@1 {
+ target-path = "i2c_arm/ads1115";
+ __dormant__ {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ channel_a: channel_a {
+ reg = <4>;
+ ti,gain = <1>;
+ ti,datarate = <7>;
+ };
+ };
+ };
+
+ fragment@2 {
+ target-path = "i2c_arm/ads1115";
+ __dormant__ {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ channel_b: channel_b {
+ reg = <5>;
+ ti,gain = <1>;
+ ti,datarate = <7>;
+ };
+ };
+ };
+
+ fragment@3 {
+ target-path = "i2c_arm/ads1115";
+ __dormant__ {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ channel_c: channel_c {
+ reg = <6>;
+ ti,gain = <1>;
+ ti,datarate = <7>;
+ };
+ };
+ };
+
+ fragment@4 {
+ target-path = "i2c_arm/ads1115";
+ __dormant__ {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ channel_d: channel_d {
+ reg = <7>;
+ ti,gain = <1>;
+ ti,datarate = <7>;
+ };
+ };
+ };
+
+ __overrides__ {
+ addr = <&ads1115>,"reg:0";
+ cha_enable = <0>,"=1";
+ cha_cfg = <&channel_a>,"reg:0";
+ cha_gain = <&channel_a>,"ti,gain:0";
+ cha_datarate = <&channel_a>,"ti,datarate:0";
+ chb_enable = <0>,"=2";
+ chb_cfg = <&channel_b>,"reg:0";
+ chb_gain = <&channel_b>,"ti,gain:0";
+ chb_datarate = <&channel_b>,"ti,datarate:0";
+ chc_enable = <0>,"=3";
+ chc_cfg = <&channel_c>,"reg:0";
+ chc_gain = <&channel_c>,"ti,gain:0";
+ chc_datarate = <&channel_c>,"ti,datarate:0";
+ chd_enable = <0>,"=4";
+ chd_cfg = <&channel_d>,"reg:0";
+ chd_gain = <&channel_d>,"ti,gain:0";
+ chd_datarate = <&channel_d>,"ti,datarate:0";
+ };
+};
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